Posttraumatic Syringomyelia Workup
- Author: Lance L Goetz, MD; Chief Editor: Stephen Kishner, MD, MHA more...
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- Pulmonary function tests, especially vital capacity, should be ordered on any patient with symptoms or suggested respiratory impairment. Serial studies are useful to document and monitor for progression.
- No specific laboratory blood studies have proven useful in the diagnosis or monitoring of PTS.
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- Magnetic resonance imaging (MRI), myelography-enhanced computed tomography (CT-myelogram), and plain radiographs of the spine are useful in the diagnosis and management of PTS.
- MRI is the preferred initial imaging study for the diagnosis of PTS. Most PTS develops around the site of the original spinal cord lesion. T1 and T2 sequences provide differentiation between CSF and normal spinal cord tissue and areas of spinal cord edema, myelomalacia, or gliosis. Serial examinations are necessary to evaluate for changes in cavity size over time. In addition, there is a marked lack of correlation between cavity size and severity of clinical symptoms. (See images below.)T1-weighted magnetic resonance imaging (MRI) scan of a slender syrinx (arrow) extending from the C5 vertebral level. This syrinx extends beyond the image to an area of spinal cord disruption at the T3 vertebral level.
- CT-myelography delineates the extent of the syrinx cavity, arachnoid scarring, and tethering of the spinal cord. This study demonstrates the extent of obstruction to CSF flow.
- Radiographs of the spine delineate spinal deformities such as fractures, dislocations, and abnormal spinal kyphotic or lordotic changes. Flexion/extension views assist in evaluation of spinal stability.
- Ultrasonography may be used intraoperatively after laminectomy to visualize syrinx cavities and septations.
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- Serial quantitative strength measurements including pinch and grip tests or hand-held myometry are useful in confirming progression of weakness.
- Calculation of the central motor conduction time using motor evoked potentials is useful in monitoring PTS; however, this technique is not widely available.
- Standard electromyographic techniques, including nerve conduction studies, F-wave latencies, and needle electromyography (EMG), are less sensitive and specific in detecting PTS. Needle EMG may demonstrate a variety of abnormalities, including continuous motor unit activity, synchronous motor unit potentials, myokymic discharges, segmental and propriospinal myoclonus, and respiratory synkinesis. However, as these studies are best used to exclude other causes for the person's symptoms.
On pathologic section, cavitation of the gray matter is seen within the spinal cord. This phenomenon may involve the central canal or may be located eccentrically. An inner layer of gliotic tissue usually is present. The gray matter between the dorsal horns and posterior columns often is involved, possibly because of its relative avascularity and lack of connective tissue. Multiple cyst cavities, separated by complete or partial septae, are often present.
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