[Hematoma of the pyramidal muscle. A complication of anticoagulant treatment].

A patient developed a hematoma of the pyramidal muscle as a complication of anticoagulant treatment. The lesion provoked an entrapment neuropathy due to the compression between the muscle and the iliac spine of the great sciatic, inferior gluteal and pudendal nerves. Hyperalgic paralysis of the leg and buttock was associated with bladder sphincter disorders and impotence, a remarkable finding in view of the unilateral disturbance in nervous control. Pain, and urinary and sexual disorders were reversed dramatically by an early neurolysis. A CT scan enables the identification of the lesion.