Case 2-2025: A 21-Year-Old Man with Loss of Consciousness and a Fall

Eric F. Shappell

From the Departments of Emergency Medicine (E.F.S.), Radiology (B.P.A.), Medicine (S.S.A.), and Neurology (D.J.L.), Massachusetts General Hospital, and the Departments of Emergency Medicine (E.F.S.), Radiology (B.P.A.), Medicine (S.S.A.), and Neurology (D.J.L.), Harvard Medical School — both in Boston.

Brooks P. Applewhite

From the Departments of Emergency Medicine (E.F.S.), Radiology (B.P.A.), Medicine (S.S.A.), and Neurology (D.J.L.), Massachusetts General Hospital, and the Departments of Emergency Medicine (E.F.S.), Radiology (B.P.A.), Medicine (S.S.A.), and Neurology (D.J.L.), Harvard Medical School — both in Boston.

Sharl S. Azar

Department of Medicine, Harvard Medical School, Boston

David J. Lin

From the Departments of Emergency Medicine (E.F.S.), Radiology (B.P.A.), Medicine (S.S.A.), and Neurology (D.J.L.), Massachusetts General Hospital, and the Departments of Emergency Medicine (E.F.S.), Radiology (B.P.A.), Medicine (S.S.A.), and Neurology (D.J.L.), Harvard Medical School — both in Boston.