• The clinical spectrum of juvenile head trauma syndromes was derived from an analysis of 50 attacks in 25 patients. Attacks were grouped into four clinical types: (1) hemiparesis; (2) somnolence, irritability, and vomiting; (3) blindness; and (4) brain stem signs. Our evidence shows that these four types are different manifestations of a common underlying process. All attacks followed mild head trauma after a latent interval, generally of one to ten minutes. Forty of the 50 attacks occurred in patients under 14 years of age. Full recovery occurred after a variable time in all but one instance. This patient, and one other, had an angiographically demonstrable occlusion of a branch of the middle cerebral artery. In clinical and laboratory features, these attacks resemble classical migraine and presumably have a similar underlying mechanism.