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Posttraumatic progressive myelopathy. Clinical and radiologic correlation employing MR imaging, delayed CT
Abstract:
Posttraumatic progressive myelopathy (PTPM) was studied in nine patients and grouped into three categories on the basis of characteristic radiographic findings and response to therapy: (a) myelomalacia with no cystic degeneration, which has poor response to therapy; (b) small cysts, with poor response to therapy; and (c) large cysts, which are effectively treated by decompression. One type dominated in each patient, although a mixture of types was present in each. Magnetic resonance (MR) imaging gave slightly improved resolution and specificity of type, decreased morbidity, and simplification of procedure in comparison with imaging by delayed computed tomographic metrizamide myelography (DCTM). DCTM and MR imaging results correlated nearly equally with those of intraoperative sonography (IOS) and pathologic study at surgery. IOS was superior to DCTM or MR imaging in detecting septations and small additional cysts. IOS also was helpful in myelotomy positioning, shunt placement, and verification of cyst decompression. MR imaging may replace DCTM in the preoperative evaluation of PTPM, followed by IOS imaging as indicated. Patients with nonmyelopathic signs and symptoms (e.g., radiculopathy) probably still require study with conventional and/or CT myelography.
Insights
Posttraumatic progressive myelopathy (PTPM) is categorized by cyst size, with large cysts responding well to decompression. Advanced imaging like MR imaging and intraoperative sonography improve diagnosis and treatment planning for PTPM.
Area of Science:
- Neurology
- Radiology
- Neurosurgery
Background:
- Posttraumatic progressive myelopathy (PTPM) presents a diagnostic and therapeutic challenge.
- Understanding the radiographic and therapeutic characteristics of PTPM is crucial for patient outcomes.
Purpose of the Study:
- To categorize PTPM based on radiographic findings and treatment response.
- To compare the efficacy of different imaging modalities in diagnosing PTPM.
- To evaluate the role of intraoperative sonography (IOS) in PTPM management.
Main Methods:
- Retrospective study of nine patients with PTPM.
- Classification into three categories: myelomalacia without cysts, small cysts, and large cysts.
- Comparison of Magnetic Resonance (MR) imaging, delayed computed tomographic metrizamide myelography (DCTM), and intraoperative sonography (IOS).
Main Results:
- Large cysts were effectively treated by decompression, while myelomalacia and small cysts showed poor response.
- MR imaging offered improved resolution and specificity over DCTM.
- IOS demonstrated superiority in detecting septations and small cysts, aiding surgical procedures.
Conclusions:
- PTPM can be categorized based on cyst size, guiding therapeutic strategies.
- MR imaging is a valuable tool for preoperative evaluation of PTPM, potentially replacing DCTM.
- IOS is essential for intraoperative guidance and confirmation of successful decompression.