Study Design: Spinal subarachnoid hematomas are unusual and difficult to diagnose and the outcome of treatment is influenced by the lesions that frequently accompany them.
Objectives: To clarify the neuroradiological diagnostic aspects of spinal subarachnoid hematoma as well as the results of treatment.
Background: Only recently has subarachnoid hematoma been clearly distinguished from more common subarachnoid hemorrhage and its characteristics have still not been dealt with in detail.
Methods: A total of 69 cases (3 personal case, 66 published cases) were revised in terms of etiology, diagnostic imaging and the results of both surgical and conservative treatment.
Results: The most common causes of spinal subarachnoid hematoma are coagulopathies (either pharmacologically-induced or resulting from systemic diseases) (40.5%), lumbar puncture for diagnostic or anesthesiological purposes (44.9%) and traumatic injuries (15.9%): these factors may be present singly or variously combined. They may be spontaneous (17.3%) or, in rare cases, associated with aortic coarctation or degenerative vascular diseases. Overall mortality is 25.7%. In the 50 cases in whom long-term follow-up was possible, the outcome of treatment, which is almost exclusively always surgical, was good in 93.5% of 31 patients in whom neurological status on admission was satisfactory and in 15.8% of 19 cases with severe neurological deficits.
Conclusions: MRI and CT are not usually diagnostic because they are not able to differentiate between a subarachnoid lesion and a subdural one. However, diagnosis may be possible when these investigations detect the CSF or the contrast medium surrounding the hematoma. Although the risks of producing spinal subarachnoid hematoma as a result of LP are remote, this is, in fact, the primary cause in patients with coagulopathies. The results of treatment depend on the patient's initial neurological condition, the severity of any concomitant pathologies, the position of the hematoma and the eventual association of a subdural hematoma.
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