Related Experiment Video
Updated: Dec 24, 2025
Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke
Published on: July 14, 2023
Kernohan-Woltman Notch Phenomenon in Two Patients with Subdural Hematoma and Ipsilateral Hemiparesis
Kayli Gimarc1, Teresa L Massagli
1From the Department of Rehabilitation Medicine, University of Washington, Seattle, Washington (KG, TLM); and Department of Rehabilitation Medicine and Pediatrics, Seattle Children's Hospital, Seattle, Washington (TLM).
Abstract:
CASE 1: A 9-yr-old boy presents with right subdural hematoma and ipsilateral hemiparesis. Clinical presentation and imaging are consistent with Kernohan-Woltman notch phenomenon. CASE 2: A 19-yr-old man presents with right subdural hematoma and ipsilateral hemiparesis. Clinical presentation is consistent with Kernohan-Woltman notch phenomenon. CLINICAL PEARL: Kernohan-Woltman notch phenomenon is a false-localizing neurologic sign that presents with hemiparesis ipsilateral to the primary lesion. It occurs in the setting of transtentorial herniation, during which the contralateral cerebral peduncle is compressed against the free edge of the tentorium, causing compression of descending corticospinal tract fibers.
