Transient cheiro-oral syndrome due to a ruptured intracranial dermoid cyst.

We present here a case of episodic, pure cheiro-oral syndrome caused by a ruptured intracranial dermoid cyst. Cranial magnetic resonance imaging (MRI) using the fat-suppression method revealed a fatty mass lesion in the subarachnoid space of the left parasellar region and multiple lipid droplets in the subarachnoid space over the left perisylvian area. Although no evidence for it pathogenesis was obtained, the patient's cheiro-oral syndrome could have resulted from a transient vasospasm around the left ventral posterior thalamic nucleus or postcentral gyrus.