PMC3198666_01
Preoperative T1 weighted image MRI, axial plain, showing a round isointense mass in a location typical for a colloid cyst (a), T2 weighted image MRI, sagital (b) and coronal (c) plain.
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F1
CT and MRI have shown a 15 mm mass of the third ventricle which was isointense in both T1 and T2 images (fig. 1).
Postoperative T1 weighted image MRI, sagital plain, showing the total removal of the mass via the transcallosal approach (a), T2 weighted image MRI, axial plain (b)
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F2
Follow-up MRI two months postoperatively have shown a radical removal of the tumour and a resolution of hydrocephalus (fig. 2).
(a) Hematoxylin-Eosin (HE), 100x. Typical palisading of neoplastic cell nuclei in Verocay body in cellular Antoni A area. (b) HE, 200x. Detail of Verocay body with palisading nuclei. (c) Ki-67, 200x. Proliferative marker Ki-67 is showing a minimal activity (sporadic positive brown nuclei), (d) S-100, 200x: Partial positivity (brown) of neoplastic cells on marker S-100
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F3
Histologically intraventricular schwannoma WHO GrI was confirmed (fig. 3).