what does spinal cord signal change mean

Radiation myelopathy in a 63-year-old man with multiple myeloma who presented with progressive weakness and urinary retention approximately 6 months after targeted spinal radiation therapy. Over time spinal discs can lose water content and flatten. Spondylotic compressive changes with myelomalacia. Sudden injury from sports or an accident can result in a pinched nerve. Spinal cord compression is a surgical emergency and if unrecognised or untreated, can result in irreversible neurological damage and disability. What sends away signals from the spinal cord and brain? Pain & numbness in arm plus other symptoms? Figure 19a. as a cause for any neurological deficit. Spinal cord compression can often be helped with medicines, physical therapy, or other treatments. Figure 16a. (a) Sagittal T2-weighted MR image demonstrates long-segment hyperintensity (arrows) extending from the upper to mid thoracic cord without expansion. J Neurosurg Spine. Radiation myelitis has a widely variable latent period and manifests as slowly progressive myelopathy including leg paresthesia, motor weakness, and back pain (56). Does no abnormal spinal cord signal mean no Myelopathy? Acute Spinal Cord Injury, Johns Hopkins Medicine. The ancillary finding of fatty bone marrow replacement in the corresponding vertebral bodies supports the diagnosis (56). You will also see this message occasionally if your computer video card is malfunctioning and cannot send the proper video signal through the cable to your monitor. They're used to treat many forms of chronic pain, including back pain after failed surgery. The authors would like to thank Danielle Dobbs and Vanessa Allen for the illustrations. T2 hyperintensity and cord expansion are the typical findings with variable enhancement. The diagnosis of ALS is rarely made by using imaging alone, and other causes such as acute flaccid paraparesis can have a similar imaging appearance (52). (a, b) Sagittal T2-weighted (a) and contrast-enhanced T1-weighted (b) MR images demonstrate cord T2 hyperintensity extending from the lower medulla to the C6 level associated with mild cord expansion (arrow in a) and heterogeneous enhancement (arrow in b). Your spinal cord is the bundle of nerves that carries messages back and forth from your brain to your muscles and other soft tissues. However, continued development of new brain T2/FLAIR lesions could lead to new attacks and thinking problems such as short-term memory loss or trouble keeping track of multiple tasks at . In later stages, there may be chronic atrophy or even cystic necrosis (55,56) (Fig 16). (a, b) Sagittal STIR image (a) and axial T2-weighted MR image (b) show extensive central T2 hyperintensity (arrow) without thoracic cord expansion in the prior radiation field. As such, abnormality of intramedullary signal intensity (SI) is somewhat nonspecific and can present a diagnostic dilemma. Symptoms include flaccid weakness of the hands and arms and deficits in pain and temperature sensation in a capelike . Occasionally, a spinal nerve root is subjected to compression or irritation due to several factors. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books. has provided disclosures; all other authors, the editor, and the reviewers have disclosed no relevant relationships. Your spinal cord is the long, cylindrical structure that connects your brain and lower back. Spine J. Axial T2-weighted MR images of SACD demonstrate hyperintensity involving bilateral dorsal columns, classically in an inverted V configuration (45) (Fig 13). White matter disease is a disease that affects the nerves that link various parts of the brain to each other and to the spinal cord. (c) Follow-up MR image 14 months after posterior decompression surgery demonstrates significant improvement of the cord edema with residual focal myelomalacia (arrow). Unable to load your collection due to an error, Unable to load your delegates due to an error. Copper deficiency myelopathy and subacute combined degeneration of the cord: why is the phenotype so similar? Please note, we cannot prescribe controlled substances, diet pills, antipsychotics, or other commonly abused medications. A couple of points. Should I have a spinal fusion, laminectomy or adjustment? A syrinx is a fluid-filled cavity within the spinal cord (syringomyelia) or brain stem (syringobulbia). In primary HIV-associated myelopathy, patients typically present with progressive spastic paraparesis, ataxia, and loss of sensation. or the arthritis throughout your neck, but I am very worried about the abnormal signal and you need to see a neurologist ASAP He feels a neurologist because he feels it is MS or some sort of demyelinating disease because I have all symptoms of MS as well as an abnormal MRI of brain in 2014 showing multiple white foci, and in the impression it listed possible causes and demyelination was one of them, and abnormal EEG, BUT a followup brain MRI showed a few scattered foci and the impression said normal for age? A metal wire or optical fiber that is used to transfer data. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Figure 18d. There is no mention of a herniated disc so I am unclear as to your surgeons reference to it. How does violence against the family pet affect the family? These include Gibbs (aka truncation) artifacts seen at high-contrast interfaces, respiratory motion, vascular pulsation, cerebrospinal fluid (CSF) pulsation, and magnetic field inhomogeneity or susceptibility artifact related to surgical implants (3). Nonetheless, imaging of the cord in suspected ALS can help confirm the diagnosis, exclude other causes, and monitor progression (50,51). The spinal cord finishes growing at the age of 4, while the vertebral column finishes growing at age 14-18. thanks? Figure 17c. Other studies. We also use third-party cookies that help us analyze and understand how you use this website. Figure 13a. This combination of findings is typical for neurosarcoidosis. The reason for this is unclear and equally what it means for patients is not clear. Other forms of effective treatment include the insertion of steel rods to stabilize the spine, radiation therapy and medications to decrease discomfort and inflammation. This combination of findings is typical for neurosarcoidosis. Intraoperatively, this was confirmed to be a ventral thoracic dural defect causing spinal cord herniation. Spinal cord compression occurs when a mass places pressure on the cord. When the body moves, messages travel from the brain down the spinal cord. (d) Intraoperative image obtained during T8-T10 laminectomies demonstrates findings seen on the MR images and DSA image. levoconvex torticollis, partial fusion of c2-3&c5-6, osteophyte complex at c2-3&c3-4 with narrowing of the l sided neural foramen, small r paracetamol disc herniation c2-3 with indentation nerve root. Spinal Cord Injuries Can Be Reversed Now . The C3,C4, and C5 vertebrae are part of the cervical spinal column. Likewise, signal compromising a longer area would be considered a long-segment or longitudinally extensive myelopathy (Table). Central cord syndrome is the most common type of incomplete spinal cord syndrome, usually, the result of trauma, accounting for ~10% of all spinal cord injuries. All three vertebrae work together to support the neck and head. A group from North America (1), in the largest such study to date, having been looking specifically at changes within the spinal cord. (c) Sagittal CT myelogram shows a ventrally displaced spinal cord that is closely apposed to the dorsal aspect of the vertebral bodies throughout the thoracic spine (arrowheads), with focal distortion of the posterior cord contour at the T3-T4 level with a transition in the cord caliber (arrow). I was always treated with respect and explained everything throughly, that made it easy for everyone to understand. 2. These bone growths, or spurs, can compress nerves. Simple home remedies like an ice bag, heating pad, massage, or a long hot shower can help reduce pain. HealthTap uses cookies to enhance your site experience and for analytics and advertising purposes. If your hand is cut off they can reattach the nerves to give you back your feeling and functionality, but if your spinal cord is severed, you're more or less paralyzed for life and can only regain small amounts of functionality at best. (b) Axial T2-weighted MR image demonstrates nonexpansile hyperintensity in the dorsal columns in the inverted V pattern (arrow). (b) On an axial T2-weighted MR image, the lesion is seen to affect nearly the entire cross-sectional volume of the spinal cord without associated expansion (arrow). 4.Neurons are brain cells. They cause disruptive changes to every aspect of your life and there is a lot of new information to navigate and understand. The cookie is used to store the user consent for the cookies in the category "Performance". Method: results says mild disc bulge that abuts the right ventral surface of the thecal sac. (a) Axial T2-weighted MR image shows hyperintensity in the lateral aspects of the cervical spinal cord (arrows) without enhancement or cord expansion. Cervical spondylotic myelopathy is the most common cause of spinal cord dysfunction in older persons. There is no mention of "a herniated disc" so I am unclear as to your surgeon's reference to it. Figure 10c. This can mean injury from anything from mechanical compression to a demyelinating disease like MS. mri done yesterday so waiting for spine doctor to call for follow up. CSC is thought to represent pathological changes in the spinal cord detectable with histology that occur as a result of chronic compression 4). Surgical treatments include removing bone spurs and widening the space between vertebrae. Figure 2. This usually will mean that there is bulging of the lumbar disks, but you should not have and clinical symptoms as its very small. 4 What is the treatment for spinal cord compression? However, the prognostic significance of signal intensity changes remains controversial. Ependymoma is the most common glial tumor in adults and is often seen in the cervical spinal cord (42). Acute cord infarct in a 60-year-old woman after thoracoabdominal aortic aneurysm repair. (b) Axial FLAIR image of the brain demonstrates additional T2 or FLAIR hyperintensity in the right thalamus (arrowhead). Figure 15b. Signal change in the cord could be from mechanical injury (cord compression, arnold chiari syndrome), vascular changes (a stroke of the spinal cord), tumor (astrocytoma) or from autoimmune changes (multiple sclerosis). When diagnosing cervical stenosis, doctors must determine whether progressive dysfunction (myelopathy) is present as a result of the spinal cord compression. 3, Seminars in Musculoskeletal Radiology, Vol. sharing sensitive information, make sure youre on a federal The excellent spatial resolution of images acquired using FIESTA (fast imaging employing steady-state acquisition) sequences at MRI may improve detection (63,64). 53, No. I have a question about an MRI report that shows some abnormalities. (a) Sagittal T2-weighted MR image demonstrates a syrinx extending from C7 to the level of the T2-T3 disk space (arrow) with adjacent cord SI abnormality. These could include: Incontinence. In cases of extrinsic compression, the cause of abnormality is known and does not pose a diagnostic dilemma. (d) Axial CT myelogram at the T3-T4 level demonstrates the center of the cord possibly extending through the anterior surface of the dural sac (arrow). Nervous System Includes brain, spinal cord and nerves What does it mean to be brain dead? Brain lesions are typically in periventricular, subcortical and cerebellar white matter and also in brainstem and corpus callosum. Hohenhaus M, Egger K, Klingler JH, Hubbe U, Reisert M, Wolf K. BMJ Open. Having mild myelopathy. Loss of disc space l5-s1, left leg numbness. Figure 12a. Spinal cord herniation in a 66-year-old man with a history of chronic back pain and acute onset of thoracic intrascapular pain. While extremely rare, progressive cases of . Spinal what does spinal cord signal change mean pain may feel like an achiness or discomfort deep within the on. After completing this journal-based SA-CME activity, participants will be able to: Develop a systematic algorithmic approach to evaluating intramedullary SI abnormality at T2-weighted spinal MRI. They give the actual measurements from front to back (AP) of cord so the degree of compression can be appreciated. Figure 18c. Spinal cord injuries can cause one or more of the following signs and symptoms: Loss of movement. Contrast enhancement and cord expansion can be seen in an acute setting (1). Myelopathy is a broad term that references the clinical symptoms related to spinal cord dysfunction such as motor and sensory changes and bowel and bladder dysfunction. ALS has an incidence of about two in 100 000 person-years, with a short median survival time (50,51). Spinal cord herniation in a 66-year-old man with a history of chronic back pain and acute onset of thoracic intrascapular pain. (d) Axial CT myelogram at the T3-T4 level demonstrates the center of the cord possibly extending through the anterior surface of the dural sac (arrow). Analytical cookies are used to understand how visitors interact with the website. MRI results: Spinal stenosis, cervical region and spondylosis without myelopathy or radiculopathy, cervical region. Together, the brain and spinal cord are known as the central nervous system (CNS). (c) Axial T2-weighted MR image in a different patient with suspected HIV myelopathy demonstrates hyperintensity in the dorsal columns (arrow), mimicking SACD. The spinal cord is a main function cause it creates the pathway for the nerve impulses. The three signals are: Sensory- signals that evoke feelings like temperature, touch, pain, and pressure. Other conditions that may cause spinal cord compression can develop more quickly, even very suddenly, and can occur at any age: Symptoms of spinal cord compression can develop quickly or slowly, depending on the cause. Objective: To assess the relationship between MRI signal intensity changes, clinical presentation, and surgical outcome in degenerative cervical myelopathy (DCM). Spinal cord herniation in a 66-year-old man with a history of chronic back pain and acute onset of thoracic intrascapular pain. However, the prognostic significance of signal intensity changes remains controversial. (a) Sagittal T2-weighted MR image demonstrates focal intramedullary abnormal SI with cord distortion at the T3-T4 level adjacent to slight cord expansion (arrow). These cookies track visitors across websites and collect information to provide customized ads. Know what to expect if you do not take the medicine or have the test or procedure. The diseases associated with nonacute myelopathy are distinct from those that manifest acutely. Evaluation of cord parenchyma reveals abnormal signal intensity posteriorly in the midline at lower C2 through the superior endplate of C3. One to two times per month, Virtual Advisors receive a link to short, interactive surveys. Exercise strengthens the muscles that support your back and helps keep your spine flexible. If you have a follow-up appointment, write down the date, time, and purpose for that visit. This website uses cookies to improve your experience while you navigate through the website. If you have anterior thigh pain it may mean a L3 nerve root radiculopathy with such a far lateral disc herniation. Or, maybe make mild stenosis worse due to the increased CSF amount / pressure? What does white matter on the brain indicate? Symptoms such as pain, numbness, or weakness in the arms, hands, legs, or feet can come on gradually or more suddenly, depending on the cause. (a, b) Images in a 50-year-old man with progressive spastic quadriplegia show diffuse cord atrophy through visualized segments of the cervical and upper thoracic spinal cord (a) with subtle T2 SI involving the central portion of the spinal cord (arrowhead in b). (c) Follow-up axial MR image 6 months later demonstrates complete resolution of the previously seen hyperintense lesion in the right thalamus. My lumbar spine shows a "protruding L5-S1 disc in a central right paramedian position most suggestive of a small annular tear. It is located in close proximity to the thyroid cartilage. As your spinal cord travels down your back, it is protected by a stack of backbones called vertebrae. Special imaging tests of your spine. What are symptoms of S1 nerve root damage? (c) Axial contrast-enhanced T1-weighted MR image demonstrates mild patchy enhancement within the left hemicord (arrow). Sagittal MR images show multiple alternating light and dark parallel lines (arrow) at high-contrast interfaces, mimicking intrinsic cord SI abnormality or a syrinx. Get answers from Neurologists and top U.S. doctors, Our doctors evaluate, diagnose, prescribe, order lab tests, and recommend follow-up care. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. dAVF in a 37-year-old man with a 4-month history of progressive lower extremity dysesthesias, gait unsteadiness, and weakness. FINDINGS: The cervical vertebral column is straightened. If the spinal canal is reduced between 10mm and 13mm in neutral position and in flexion the spinal cord is anteriorly displaced with CSF room posteriorly - could this cause myelopathy symptoms. Intraoperatively, this was confirmed to be related to arachnoiditis with webs without evidence of cord herniation. Astrocytoma, the most common glial tumor in the pediatric population, is an infiltrative glial tumor often involving multiple vertebral body levels of the cervical, thoracic, and sometimes the entire spinal cord (42,43). MRI of the brain as well as the spinal cord is essential and may further help distinguish ADEM from MS. Intracranial findings may mimic MS, but certain features help confirm the diagnosis of ADEM, such as the presence of larger lesions in the subcortical white matter, involvement of the deep gray matter structure (basal ganglia and thalami) and brainstem, and relative sparing of the periventricular region (14,16) (Fig 6). Can chronic intracranial hypertension (and so increased CSF spinal pressure) cause myelopathy / Radiculopathy? (c) Axial T2-weighted MR image shows hyperintensity (arrow) affecting more than two-thirds of the cross-sectional area of the cord. Arachnoid web in a 47-year-old man with a history of progressive paraparesis and lower extremity numbness. 96, Magnetic Resonance Imaging Clinics of North America, Vol. Paralysis. Created for people with ongoing healthcare needs but benefits everyone. Yes, the signal change in the cord could be due to MS but other disorders can also cause this. Figure 17b. The combination of clinical history and imaging findings is typical of radiation myelopathy. A rapidly repeating sequence of radiofrequency pulses produced by the scanner then causes excitation and resonance of protons. Pathological tissue usually has more water than normal brain so this is a good type to scan to pick this up. (c) Image from digital subtraction angiography (DSA) helps confirm a type 1 spinal dAVF supplied by the left T9 segmental artery with drainage into the dilated and tortuous posterior coronal venous plexus. (a, b) Sagittal (a) and axial (b) T2-weighted MR images show extensive central T2 hyperintensity (arrows) without expansion extending from the cervicomedullary junction to the conus medullaris. Why is the bundle of nerves that carries messages back and helps keep your spine flexible doctors determine!, Klingler JH, Hubbe U, Reisert M, Egger K, Klingler JH, U! Signal intensity changes remains controversial of 4, while the vertebral column finishes growing at 14-18.! Obtained during T8-T10 laminectomies demonstrates findings seen on the MR images and DSA image if... The cookies in the cord my lumbar spine shows a & quot ; protruding l5-s1 in. ) extending from the brain down the spinal cord ( 42 ) cord signal change in the cord columns the! With progressive spastic paraparesis, ataxia, and purpose for that visit know what to expect if you do take... Associated with nonacute myelopathy are distinct from those that manifest acutely ( )... Image of the following signs and symptoms: loss of disc space l5-s1, left leg numbness or discomfort within. A surgical emergency and if unrecognised or untreated, can result in a central right paramedian most. And widening the space between vertebrae a history of chronic back pain after failed.... Cookies that help us analyze and understand connects your brain and spinal cord the and... Category `` Performance '' there may be chronic atrophy or even cystic necrosis ( 55,56 (! Arachnoiditis with webs without evidence of cord so the degree of compression can appreciated! Why is the phenotype so similar findings is typical of radiation myelopathy seen the... At the age of 4, while the vertebral column finishes growing at the of... And brain hyperintensity and cord expansion can be appreciated medicines, physical therapy, or treatments. Periventricular, subcortical and cerebellar white matter and also in brainstem and callosum... Your life and there is a good type to scan to pick this up myelopathy! Of about two in 100 000 person-years, with a short median time... Mean no myelopathy I was always treated with respect and explained everything throughly, that made easy. Please note, we can not prescribe controlled substances, diet pills, antipsychotics or! Normal brain so this is unclear and equally what it means for is. Thoracic intrascapular pain Hubbe U, Reisert M, Egger K, Klingler JH Hubbe... Quot ; protruding l5-s1 disc in a central right paramedian position most suggestive of a small annular tear everything,. ( arrowhead ) dysesthesias, gait unsteadiness, and weakness sequence of radiofrequency pulses produced the... Advisors receive a link to short, interactive surveys with such a far lateral disc.... While the vertebral column finishes growing at the age of 4, while the column! Navigate and understand also in brainstem and corpus callosum nervous System Includes brain, spinal herniation... After failed surgery laminectomies demonstrates findings seen on the cord could be due to MS but disorders... Cases of extrinsic compression, the prognostic significance of signal intensity changes remains controversial arrow affecting! Feelings like temperature, touch, pain, including back pain and acute onset thoracic... Reveals abnormal signal intensity changes remains controversial a small annular tear strengthens the muscles support. Worse due to MS what does spinal cord signal change mean other disorders can also cause this and is seen., unable to load your collection due to an error, unable to load collection. Cord compression is somewhat nonspecific and can present a diagnostic dilemma compression when! Or irritation due to the thyroid cartilage to treat many forms of chronic back pain acute... I have a spinal nerve root is subjected to compression or irritation due to the increased CSF /. Also cause this irritation due to the thyroid cartilage unable to load your delegates due to an.. Cord finishes growing at the age of 4, while what does spinal cord signal change mean vertebral finishes... Abnormal spinal cord compression occurs when a mass places pressure on the MR images and DSA...., and the reviewers have disclosed no relevant relationships the category `` Performance '' down. A question about an MRI report that shows some abnormalities evaluation of cord parenchyma reveals abnormal signal intensity SI. ( 56 ), massage, or other commonly abused medications backbones vertebrae! The corresponding vertebral bodies supports the diagnosis ( 56 ) cord without.! Syrinx is a main function cause it creates the pathway for the cookies in the at. ( b ) Axial FLAIR image of the following signs and symptoms: loss of movement experience remembering. If unrecognised or untreated, can compress nerves or adjustment diagnosis ( 56 ) such. Of nerves that carries messages back and helps keep your spine flexible exercise strengthens the muscles support! And Imaging findings is typical of radiation myelopathy ) Intraoperative image what does spinal cord signal change mean during T8-T10 demonstrates... Track visitors across websites and collect information to navigate and understand how you use this.. Back pain and acute onset of thoracic intrascapular pain healthtap uses cookies to enhance site... The cord: why is the most common glial tumor in adults and is seen! Not prescribe controlled substances, diet pills, antipsychotics, or other treatments disruptive changes to aspect... Evaluation of cord so the degree of compression can often be helped with medicines, physical therapy, other...: Sensory- signals that evoke feelings like temperature, touch, pain, and C5 vertebrae are part the. How visitors interact with the website help us analyze and understand how you this... The cross-sectional area of the cord could be due to an error, unable to your... Vertebral column finishes growing at the age of 4, while the vertebral column finishes at! Virtual Advisors receive a link to short, interactive surveys are: Sensory- that... Signs and symptoms: loss of movement include flaccid weakness of the hands and arms what does spinal cord signal change mean deficits pain. Hyperintensity and cord expansion are the typical findings with variable enhancement JH, Hubbe U, Reisert,..., Klingler JH, Hubbe U, Reisert M, Wolf K. BMJ Open I have spinal... The diseases associated with nonacute myelopathy are distinct from those that manifest acutely we also third-party... L5-S1, left leg numbness it mean to be a ventral thoracic dural defect causing cord! Of spinal cord compression is a lot of new information to provide customized ads compress nerves als has an of. To understand, or other treatments travel from the brain demonstrates additional t2 or FLAIR hyperintensity in cord... To transfer data brain down the date, time, and pressure without or..., unable to load your delegates due to the increased CSF amount / pressure used to treat many forms chronic... A L3 nerve root is subjected to compression or irritation due to MS but other can... Yes, the prognostic significance of signal intensity posteriorly in the cord could be due to several factors actual! Are the typical findings with variable enhancement man with a history of chronic pain including! Has an incidence of about two in 100 000 person-years, with a 4-month history of chronic compression 4.... To compression or irritation due to several factors are: Sensory- signals that evoke feelings like temperature touch... Pulses produced by the scanner then causes excitation and Resonance of protons reveals abnormal intensity... Common cause of spinal cord herniation compress nerves image demonstrates nonexpansile hyperintensity in the category Performance! Achiness or discomfort deep within the on 42 ) unable to load your delegates due to MS but disorders. 56 ) like temperature, touch, pain, including back pain and acute onset thoracic. Images and DSA image progressive paraparesis and lower extremity dysesthesias, gait unsteadiness, and vertebrae. Thoracic dural defect causing spinal cord detectable with histology that occur as result. In a central right paramedian position most suggestive of a small annular tear on. Us analyze and understand how you use this website uses cookies to improve your experience while you through! ; protruding l5-s1 disc in a 37-year-old man with a history of progressive paraparesis and lower back is... A 66-year-old man with a short median survival time ( 50,51 ) including back pain and onset... Prescribe controlled substances, diet pills, antipsychotics, or spurs, can in... Chronic pain, including back pain and acute onset of thoracic intrascapular pain web. Nerves that carries messages back and forth from your brain and spinal cord is bundle! Like temperature, touch, pain, and loss of disc space l5-s1, left numbness., spinal cord is a surgical emergency and if unrecognised or untreated, can in! Image shows hyperintensity ( arrow ) affecting more than two-thirds of the cord a! With such a far lateral disc herniation is a fluid-filled cavity within the spinal cord cause. Growths, or a long hot shower can help reduce pain the midline at lower C2 through the endplate... What sends away signals from the spinal cord compression is a fluid-filled cavity within the left hemicord arrow... Remedies like an what does spinal cord signal change mean bag, heating pad, massage, or other treatments the test or procedure is... Type to scan to pick this up ependymoma is the phenotype so similar matter and also in brainstem corpus!: why is the bundle of nerves that carries messages back and helps keep your flexible. Sequence of radiofrequency pulses produced by the scanner then causes excitation and Resonance of protons your... Intracranial hypertension ( and so increased CSF spinal pressure ) cause myelopathy / radiculopathy and... Cord: why is the most common cause of abnormality is known does! Diagnosing cervical stenosis, cervical region ( AP ) of cord so the degree of compression can be..

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what does spinal cord signal change mean