Ulnar neuropathy resulting from diffuse intramuscular hemorrhage: A case report

The ulnar nerve can be injured in the arm, forearm, and wrist. This report describes a 79-year-old woman who presented to the emergency department wit h acute lower extremity weakness and vertigo. Her medical history was signi ficant for moderate to severe aortic stenosis, hypertension, and a remote i ntravascular thrombosis in the right forearm. The patient was diagnosed wit h a transient ischemic attack and was treated with anticoagulants. Three da ys after beginning anticoagulation therapy, she developed a diffuse intramu scular hemorrhage in the arm, which compromised predominantly ulnar fibers. The clinical, radiologic, and electrodiagnostic abnormalities are reviewed , and the possible etiologies of ulnar neuropathy are discussed. To our kno wledge, this is the first report of ulnar neuropathy secondary to diffuse h emorrhage into the muscles of the arm.