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Myelopathy and Radiculopathy Due to Cervical Spondylosis: Myelographic-CT Correlations

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Myelopathy and Radiculopathy Due to Cervical Spondylosis: Myelographic-CT Correlations 601 Myelopathy and Radiculopathy Due to Cervical Spondylosis: Myelographic-CT Correlations Giuseppe Scotti,1 Giuseppe Scialfa, Sandra Pieralli, Edoardo Boccardi , Frieda Valsecchi , and Cristina Tonon Forty patients with symptoms and signs of radicular disease Materials and Methods or spinal cord involvement secondary to cervical spondylosis were studied with myelography (using non ionic water-soluble Forty pati ents (30 men and 10 women, mean age 56 years, range contrast medium) followed by computed tomographic (CT) mye­ 30-74 years) with symptoms and signs of radicular or spinal cord lography. In 17 patients CT was also performed before myelog­ disease secondary to cervi cal spondylosis were examined . The raphy. CT myelography adds useful information to the myelo­ clinical presentation was that of radicular pain in 13 pati ents. In the graphic findings. Cord compression is better evaluated and os­ oth er 27 patients signs of myelopathy (u suall y slowly progressive) teophytes can be differentiated from disk herniation. Plain CT were the major complaint. These were associated with radiculopa­ can demonstrate a herniated disk but with less accuracy than thy in 13 pati ents. CT myelography. Cord and root compression are not seen di­ All pati ents were investigated by means of myelograph y, using rectly on plain CT; for this reason myelography should be the 15 ml of the non ionic water-solu ble contrast medium iopami dol first procedure in patients with myelopathy or myeloradiculopa­ (iopamiro 300, Bracco, Milan, lIaly) in a concentration of 300 mg 1/ thy, which may be followed by CT myelography. ml introduced via lumbar puncture. CT was pe rformed with in 2 hr after myelography in all pati ents. In 17 patients, plain CT was also performed before myelography. A Siemens Somatom 2N scann er Computed tomography (CT) has substantially modified the neu­ or a GE CT / T 8800 unit was used for the CT studies. An average roradiologic approach to the diagnosis of herniated disk and spon­ of three levels were examined, selected on th e basis of cli nical dylosis in the lumbar region [1 -5]. But examination of the cervical signs or myelographic findings. Eight to 12 contiguous slices (1.5 spine by CT requires a different approach than in the lumbar region. or 2 mm th ickness) per level were done. The levels were always Thinner intervertebral disks, different anatomi c landmarks (l ess or localized by means of a preli minary digital radiograph in the lateral no epidural fat), and a greater frequency of osteophytes and nar­ projection. rowing of the canal th an in disk herniati ons are some of the distinguishing concerns of the cervical spine. Clinical presentation and differential diagnosis are also different. Results Pure cervical radiculopathy (n eurologic defi cit due to nerve root compression) is less common and occurs in younger patients. Myelographic evidence of nerve root compression and / or of Myelopathy (neurologic defi cit due to spinal cord compression) of anteri or dural sac compression by herniated disk or osteophytes different degrees of severity, ranging from simple hyperrefl exia to was demonstrated in all patients. A single level was involved in 13 severe progressive paraparesis, is more comm on and may be patients (C3- C4, one; C4-C5, three; C5-C6, six; C6-C7, two; C7- associated with signs of radicular involvement. Clinical signs of T1 , one). In the other 27 patients, mu ltiple levels were involved spinal cord involvement may be mistaken as indicating the presence (C3- C4, seven; C4-C5, 14; C5-C6, 22; C6-C7, nine; C7 - T1 , of chronic degenerative disease of the spinal cord (e.g., amy­ none). otrophic lateral sclerosis) or of a tumor in or adjacent to the cord. When CT is perform ed after myelography with the subarachnoid With cervical spine CT, there is a need not only to visualize the spaces opacified by contrast medium (CT myelography), anteri or bony and soft-tissue structures surrounding the spin al canal and to compression of the dural sac can be clearl y visuali zed. If there is study more levels than in the lumbar region, but also to recognize no space between the posteri or margin of the ve rtebral body and the effects of spondylosis on the spinal cord and nerve roots. CT the anterior surface of the sac, the compression is due either to slices mu st be thinner than in the lumbar reg ion in order to visu ali ze osteophyte (fi g. 1) or to ossification of the posterior longitudinal the intervertebral disk and neural foramina. ligament. Otherwise, a herniated disk can be suspected. At CT This study c'ompares the myelographic and CT findings in patients myelography, anterior compression of the dural sac by osteophytes with cervical spondylosis in order to assess the values and limita­ was found in 27 patients and by disk herniation in 18. The spinal tions of CT performed without and with subarachnoid contrast cord outli ned by contrast medium can be clearly seen. Compression enhancement, and to define the role of CT in the diagnostic evalu­ and deform ity of the cord can be demonstrated and may be severe, ation of patients with cervical myelopath y and / or radiculopathy. with reduction of the anteroposteri or diameter of the cord even to I All auth0rs: Ospedale Niguarda, Cil Granda, Department of Neuroradiology, Piazza Ospedale Maggiore 3, 20162 Milan, Italy. Address reprin t requests to G. Scotti. AJNR 4 :601-603, May/ June 1983 01 95-61 08 / 83 / 0403 -0601 $ 00.00 © Am erican Roen tgen Ray Society 602 SPINE AND INTERVERTEBRAL DISK AJNR:4, May/ June 1983 A B Fig. 1 .-Cervical spin e of 55-year-old woman with progressive parapa­ resis in last 2 years. A, Plain CT. Large osteophyte protruding into spinal canal. B, CT myelogram demonstrates severe degree of cord compression by impinging osteophyte. B c Fig. 3.-Posterolateral disk herniation on left in patient with pure radicu­ lopathy. A, Plain CT image shows soft-tissue structure slightly denser than remaining spin al content protruding into spinal canal (arrow). B , CT myelo­ gram. Compression and obliteration of opac:ified subarachnoid space on left A B side. C, Anteroposterior myelogram. Amputation of root sleeve with root swelling. true for root compression, never directly seen on plain CT, but well demonstrated in 11 patients when the subarachnoid spaces were opacified by contrast medium. Narrowing of the canal or the neural foramina did, however, lead to a suspicion of root compression on plain CT in six of these patients. When clinical presentation is consid ered, disk herniation or lat­ eral osteophyte was found in 12 of 13 patients with pure radiculop­ athy and in six of 27 with myelopathy or myeloradiculopathy (fig. c D 3). A narrow canal and cord compression were present in 24 Fig. 2. - CT myelographic images. A, Normal spinal cord and nerve roots patients with myeloradiculopathy and in one with pure radiculopa­ within neural foramina. B, Spin al cord compression by herniated disk. C, thy. Osteophyte impingin g on right anterior aspect of opacified sac. D, Narrow canal and hypertrophy of ligaments. Discussion Satisfactory CT examination of the cervical spine requires thin one-third of normal in some cases (fig. 2). Clear evidence of cord slices (1.5 or 2 mm), precise localization of the scanning plane by compression was found in 24 cases. Nerve root sheaths opacified preliminary digital radiography, and absence of swallowing or move­ by contrast medium can be easily followed to the neural foramina, ment artifacts. CT images must include the space between the and compression or amputation was found in 19 cases. pedicles of two adjacent vertebrae. An average of eight contiguous In the 17 patients examined by plain CT before myelography, sli ces is necessary at each level to recognize all the pertinent bony th ere was close correspondence between pre- and postcontrast CT and soft-tissue anatomy. These images must be carefully analyzed in demonstrating narrowing of the spinal canal and neural foramina for reduction of neural foramina, presence of osteophytes arising by osteophytes, seen in 12 cases by both methods. Disk herniation from vertebral bodies or articular processes, disk degeneration, was recognized in eight cases on CT with intrathecal contrast and herniations. medium, but only in five by plain CT. Cord compression was The density resolution of the spinal canal by current CT units visualized in 10 patients on CT images with subarachnoid contrast allows reliable recognition of the dural sac when the canal is of med ium, but could not be demonstrated on plain CT. The same was normal size in the upper cervical region. But only rarely can the AJNR:4, May/ June 1983 SPINE AND INTERVERTEBRAL DISK 603 spinal cord be visualized on plain CT below the level of C2. Disk We beli eve the diagnostic protocol should be tail ored according herniation may be defined as a soft-tissue structure protruding to th e patient's clinical presentation. In patients with isolated signs posteriorly from the disk with a density higher than the remaining of pure radicular compression and with pain and sensory defi cit at structures within the spinal canal. a well defined level, pl ain CT should be the first examination . Digital When a prominent osteophyte is demonstrated with resultant radiography in the lateral projection for locali zing purposes could narrowin g of th e spin al canal, the dural sac is seen less well on replace plain x-ray films. The CT examin ation should in clude the plain CT, and spinal cord compression can only be suspected, not intervertebral space clinicall y involved and one level above and proven.
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