Spontaneous rupture of intracranial dermoid or epidermoid and its radiologic findings including computed tomography (CT) and magnetic resonance (MR) imaging have been described, but, to our knowledge. there has been no report of spontaneously ruptured intrasellar cyst demonstrated by CT and MR in the literature. We report a peculiar case of intrasellar cyst with spontaneous rupture into subarachnoid space demonstrated by CT and MR imaging, with discussion of the differential diagnosis.