Imaging findings in spinal subarachnoid hemorrhage in patient with hemophilia A: an unusual cause for back pain.

Back pain and presentation with spinal canal hemorrhage in hemophilia is not common; however, these are significant clinical issues and may lead to significant neurological issues and morbidity. We present an interesting case of severe back pain in a young patient with moderate hemophilia A. Imaging confirmed subarachnoid hemorrhage in the spinal canal without intracranial hemorrhage. To the best of our knowledge this is the first described case report of subarachnoid hemorrhage in hemophilia A in the English literature. We also describe the anatomy and imaging features of hemorrhage in the different spinal canal compartments, including the subarachnoid space. Spinal canal hemorrhage in hemophilia is an emergency and serious condition and must be diagnosed and treated promptly. It is important to be aware of the diagnostic features of the spinal canal hemorrhage and carefully assess the spinal canal in hemophiliacs on cross-sectional studies.