PMC8571326_01
(a-c) T1, T2, T1+C axial cut showing a large lobulated mass in the third ventricle with contrast enhancement. (d) Flair T2 axial cut with no transependymal edema. (e and f) T1+C sagittal and coronal views.
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F1
T2/FLAIR and T1 with avid postcontrast enhancement measuring 38 by 20 by 23 mm with severe communicating hydrocephalus [Figure 1]. The provisional diagnosis was a third ventricle choroid plexus mass, and the patient was taken to surgery.
(a) In this CPP, the cells exhibit mild nuclear pleomorphism and the mitotic figures (arrows) are easily detectable (H and E, x400). (b) Immunohistochemistry shows reactivity of the epithelial cells to Pan-cytokeratin (PanCK, x200). (c) Ki-67 proliferative index is estimated up to 8% in some foci (Ki-67, x200).
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F2
The overall findings were in keeping with ACPP (WHO Grade II) [Figure 2].
PMC8571326_02
(a-c) T2, FLAIR T2, and T1+C showing right intraventricular complex solid, cystic mass with contrast enhancement. (d and e) T1, T1+C sagittal views. (f) T2 coronal view of solid cystic tumor.
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F3
T1 and intense contrast enhancement. The mass measured 36 by 29 by 30 mm, with communicating hydrocephalus [Figure 3]. The provisional diagnosis was choroid plexus lesion and the patient was taken for surgery.
(a) The tumor exhibits papillary-like architecture that has fibrovascular cores (arrow) and lining by a single layer of cuboid epithelium (H and E, x100). (b) Trichrome stain shows a collagenous fibrous stroma (green), with overlying epithelial layer (Trichrome, x200). (c) Ki-67 proliferative index is about 2% (Ki-67, x200).
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F4
I). It has the papillary architecture that resembled a normal choroid plexus, with minimal nuclear pleomorphism, very rare mitotic activity, and low Ki-67 proliferative index [Figure 4].