title: Magnetic resonance imaging of Kernohan's notch.
abstract: Compression of the cerebral peduncle against the tentorial incisura contralateral to a supratentorial mass, the so-called Kernohan's notch, can be a cause of false localizing motor signs. The authors present a case of Kernohan's notch secondary to a traumatic extradural hematoma. The patient developed an oculomotor palsy and a dense motor deficit ipsilateral to the extra-axial hematoma. Magnetic resonance imaging in the postoperative period clearly showed the midbrain lesion. The motor deficit and 3rd nerve palsy subsequently resolved.
authors.affiliation: Department of Neurosurgery, New England Medical Center, Boston, Massachusetts.
authors.forename: A R
authors.initials: AR
authors.lastname: Cohen
authors.forename: J
authors.initials: J
authors.lastname: Wilson
mesh_terms: D000328:Adult; D001930:Brain Injuries / Q000150:complications; D004677:Encephalocele / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009886:Ophthalmoplegia / Q000209:etiology; D014057:Tomography, X-Ray Computed