Ruptured intracranial dermoid cyst: a case report

Intracranial dermoid cysts are congenital, usually nonmalignant lesions with an incidence of 0.5% of all intracranial tumors. They tend to occur in the midline sellar, parasellar, or frontonasal regions. Although their nature is benign, dermoid cysts have a high morbidity and mortality risk, especially when rupture occurs. A 40 year old woman presented with head injury after she experienced sudden loss of consciousness. She had a history of headache, loss of consciousness; her past medical history was not remarkable. The patient had no complaints of nausea, vomiting, or seizures. Vital signs were stable, neurologic defi cit was not identifi ed. Computed tomography (CT) and magnetic resonance imaging (MRI) showed right temporobasal zone with fat droplets within right fi ssure Sylvii and interhemispheric fi ssure indicating a rupture of a dermoid cyst. Craniotomy and cyst resection were done, and diagnosis was confirmed with pathological examination following surgery. After surgery the patient did not recover. Cerebral ischemia from chemical meningitis was fatal for our patient. Headache as a symptom has many causes. It is rarely due to chemical meningitis arising from a ruptured dermoid cyst. This case report illustrated the importance of investigating a cause of the headache, CT and MRI being diagnostic methods. In this way, mortality as well as morbidity from complications such as chemical arachnoiditis can be significantly reduced if imaging is done early in these patients