PMC3512337_01
(a) CT brain: A large well-defined hypodense and nonenhancing mass in the pineal region, patchy calcification in the peripheral part of the tumor, with hydrocephalus. (b and c) MRI brain: A complex heterogeneous, ill-marginated mass in pineal region, with extension encroaching midbrain and infratentorium. The mass was compressing the aqueduct and causing obstructive hydrocephalus
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F1
Computerized tomography (CT) scan revealed well-defined hypodense and nonenhancing mass in the pineal region, and patchy calcification in the peripheral part of the tumor, with hydrocephalus [Figure 1a]. The mass was compressing the aqueduct and causing obstructive hydrocephalus [Figure 1b and c].
(a-c) MRI bra in: On T2 image, the mass is hyperintense. On FLAIR and DWI, the mass shows some restriction within the lesion with marked hyperintense signal
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F2
On fluid attenuated inversion recovery (FLAIR) and diffusion weighted imaging (DWI), the mass showed some restriction within the lesion with marked hyperintense signal [Figure 2a-c].
(a) Glistening tumor in quadrigeminal cistern. (b) Tumor displaced major vessels downward. (c) Histopathology showing keratin in layers. (d) Post-op CT scan showing minimal residual tumor and decreased hydrocephalus
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F3
Just in front of thickened arachnoid in the quadrigeminal cistern, there was a pearly tumor [Figure 3a]. A near-total removal was achieved without any injury to neural or vascular structures [Figure 3b]. Histopathology confirmed it as a case of epidermoid [Figure 3c]. On post-op CT scan, there was minimal residual tumor and hydrocephalus decreased [Figure 3d].