system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 41-year-old man is brought to the emergency department 3 hours after falling while mountain biking and hitting his head. Initially, he refused treatment, but an hour ago he began to develop a severe headache, nausea, and left leg weakness. He has no visual changes and is oriented to person, time, and place. His temperature is 37°C (98.6°F), pulse is 68/min, respirations are 17/min and regular, and blood pressure is 130/78 mm Hg. Examination shows a 5-cm bruise on the right side of his skull. The pupils are equal, round, and reactive to light and accommodation. Muscle strength is 0/5 in his left knee and foot. Which of the following is the most likely cause of this patient's presentation?
assistant
Subfalcine herniation