Acute Spinal Subdural Hematoma in a Patient Taking Rivaroxaban.

We report a case of a middle-aged woman who took rivaroxaban and exhibited a dramatic deterioration in lower extremity motor function after being assaulted, during which she sustained injury to her face but not to her back or other areas of her body. She had atrial flutter and had been taking rivaroxaban for 3 years, but denied history of coagulopathy and spinal vascular malformation.

Preoperative lumbar spine magnetic resonance imaging demonstrated a massive spinal subdural hematoma (SDH), extending from the lower thoracic to the upper lumbar spine (Fig. 1). Gadolinium-enhanced T1-weighted imaging showed a region of contrast extravasation on the ventral aspect of the spinal cord, suggesting a rupture of an anterior spinal artery. Emergent total laminectomy was performed to decompress the affected spinal cord region, but the patient showed no improvement of her paraplegia.

Fig. 1

Initial MRI images. (A) The T2-weighted sagittal image of the low thoracic-lumbar spine shows the hyperacute-to-acute stage of hematoma, with fluid-fluid levels in the ventral aspect of the conus medullaris and cauda equine, from T9 to L2 with craniocaudal extension. (B) GdE fat-suppressed T1-weighted sagittal image shows a slit-like vivid enhancing lesion suggesting contrast extravasation at the T12–L1 levels. (C) GdE fat-suppressed T1-weighted axial image at T11 level shows the spot-like enhancing structure (white arrow) which looks like a vessel at the midline of ventral aspect of cord. (D) GdE fat-suppressed T1-weighted axial image at T12 level shows contrast extravasation at the ventral aspect of the cord which has continuity from above.

MRI = magnetic resonance imaging, GdE = gadolinium-enhanced.

According to a commonly recognized theory proposed by Rader,1 the occurrence of spinal SDH is presumed to occur due to the rupture of a spinal vessel. The mechanism proposed by this theory is that a sudden increase of pressure in the thorax or abdomen results in an increase in pressure in a spinal vessel fed by the radiculomedullary artery, and that this pressure increase leads to vessel rupture, resulting in spinal SDH. To the best our knowledge, the present case is the first to suggest the feasibility of Rader's theory1 by showing compatible radiological findings. Additional concerns in the context of the present case are the hazards of chronic rivaroxaban therapy. There are only 3 cases of spontaneous rivaroxaban-associated spinal SDH reported in the literature.234 This report suggests the possibility that severe spinal SDH can occur through physical trauma to non-spinal areas of the body, due to rupture of an anterior spinal artery, possibly caused by an abrupt increase in intra-abdominal pressure, in patients using an anticoagulant medication like rivaroxaban.