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  • Title: Mature posterior fossa teratoma mimicking dermoid cyst.
    Author: Bohara M, Yonezawa H, Karki P, Bakhtiar Y, Hirano H, Kitazono I, Matsuyama N, Arita K.
    Journal: Brain Tumor Pathol; 2013 Oct; 30(4):262-5. PubMed ID: 23263509.
    Abstract:
    We describe a very rare case of mature posterior fossa teratoma in an adult who presented with clinico-radiological findings consistent with a dermoid cyst. A computed tomography scan showed a hypodense mass in the cistern magna with calcification and a sinus tract in the occipital bone. Magnetic resonance imaging revealed a hypo- to hyperintense mass without contrast enhancement. The intraoperative picture showed a dermal sinus and a cyst containing lipid, keratin and hair. Histopathological examination showed a tumor with components of all the three germ layers; thereby, a diagnosis of mature teratoma was made. The histopathological differentiation between teratoma and dermoid cyst is very valuable for ruling out the presence of immature/malignant or germinomatous components that would require further adjuvant therapies. Thus, we here present a rare case of posterior fossa teratoma mimicking dermoid cyst and emphasize the importance of histopathological differentiation between these entities.
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