Recurrent episodes of neck twisting in infancy, lasting minutes to days. Etiology is unknown, but the condition often occurs in families with a history of migraine syndrome. Episodes may occur weekly, every few weeks, or as rarely as every few months. They may mimic seizures. May be triggered by changing posture. Self-limiting condition. Begins by the third month of life and typically resolves by 5 years. Findings include ataxia, drowsiness, diaphoresis, neck pain, dystonia, pallor, vomiting, vertigo, mood changes, headache, gaze abnormalities, nystagmus, photophobia, headache, and retrocollis. Girls are affected more than boys. May be associated with delays in fine and gross motor development.