Differential diagnosis in a third ventricular mass: Vascular or tumoral lesion? [Bir III. Ventrikül kitlesinde ayırıcı tanı: Vasküler ya da tümöral lezyon?]

The third ventricle is the rare mainstay of a mass lesion. there are a variety of vascular or tumoral lesions located in the third ventricle. colloid cyst is one of the most frequently encountered tumoral lesions in the third ventricle,in the clinical practice. a 65-year-old man was admitted to our outpatient clinic suffering from headache and dizziness which progressed in the last 10 days. on radiological examination,(computerized tomography and magnetic resonance imaging scans) showed a well-circumscribed lesion located in the third ventricle causing hydrocephalus. however,radiologic appearance of the lesion did not allow exact differentiation between typical vascular or tumoral lesion. additionally,cerebral digital subtraction angiography (dsa) was performed and was normal. surgical intervention was successfully performed via interhemispheric transcallosal transventricular route. pathological examination revealed a colloid cyst. the adequate preoperative radiologic imaging studies are essential to avoid unexpected bewilderment during surgery. © 2014,ege university press. all rights reserved.