• Guive Sharifi, Reza Rahmanzadeh, Mahmoud Lotfinia, and Ramin Rahmanzade.
• Department of Neurosurgery, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
• World Neurosurg. 2018 Jan 1; 109: 31-35.

BackgroundColloid cyst is a gelatin-containing cyst in the brain almost always found in the third ventricle. The specific shape and location of these cysts, a round well-delineated mass in the rostral part of the third ventricle adjacent to the foramen of Monro, on imaging are the main findings for diagnosis. Several masses of the third ventricle masquerading colloid cysts on images have been reported. Based on different surgical approaches, preoperative misdiagnosis of colloid cyst may have great impact on prognosis.MethodsWe report 2 cases that presented with severe headache and hydrocephalus, and their preoperative images were highly indicative of colloid cyst.ResultsHistopathologic investigations after tumor resection showed pilocytic astrocytoma of fornix in both cases.ConclusionsFifteen cases of colloid cyst misdiagnosis with other masses have been reported thus far; among them, 2 cases were pilocytic astrocytoma. In this study we report 2 other cases. Furthermore, we discuss additional clues helping to differentiate pilocytic astrocytoma from colloid cyst on images.Copyright © 2016 Elsevier Inc. All rights reserved.

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