case_images: PMC8571326_01
case_images: (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.
case_images: SNI-12-483-g001.jpg
case_images: PMC8571326_01_SNI-12-483-g001.jpg
case_images: F1
case_images: 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.
case_images: (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).
case_images: SNI-12-483-g002.jpg
case_images: PMC8571326_01_SNI-12-483-g002.jpg
case_images: F2
case_images: The overall findings were in keeping with ACPP (WHO Grade II) [Figure 2].
case_images: PMC8571326_02
case_images: (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.
case_images: SNI-12-483-g003.jpg
case_images: PMC8571326_02_SNI-12-483-g003.jpg
case_images: F3
case_images: 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.
case_images: (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).
case_images: SNI-12-483-g004.jpg
case_images: PMC8571326_02_SNI-12-483-g004.jpg
case_images: F4
case_images: 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].