Lipomatous/Extensively Vacuolated Ependymoma with Signet-Ring Cell-Like Appearance: Analysis of a Case with Extensive Literature Review

Figure 1

Magnetic resonance imaging scans/histopathological findings (anaplastic component). (a) Postcontrast T₁ (right), T₂-weighted (center), and fluid attenuated inversion recovery, FLAIR, sequence (left) in axial and coronal planes demonstrating a left periventricular, partially cystic, and bulky tumour. (b) Panoramical low magnification photomicrograph showing a densely populated neoplasm apparently assembling rosettes (right upper field) and surrounded by geographic necrosis (left lower field). (c) High magnification photomicrograph of the right upper field shown in (b). There are multiple perivascular pseudorosettes denoting conspicuous microvascular proliferation. (d) Mitotic activity in a high-power field. (e) Ki-67 immunolabeling index (~50%).

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