PMC6668542_01
CT image of the abdominal mass shows a right lower rectus muscle heterogeneous collection: axial (a) and coronal (b) views.
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Computed tomography scan (CT-scan) revealed a 7.0 x 5.0 x 3.3 cm heterogeneous collection at the right inferior rectus sheath and concluded as most likely a scar endometriosis (Figure 1).
Histologic images of the tumor. (a) Multicystic bland appearance of the tumor, as seen on frozen section (H&E stain, X40). (b) Higher magnification of cystic spaces lined by bland-appearing, flattened cells (H&E stain, X200). (c) In other areas the tumor shows irregular infiltrating glands with fibrous stroma. (d) Highly atypical cells, with hobnail morphology and prominent nucleoli, lining the infiltrating tumor (H&E stain, X400).
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Microscopic examination of one representative section submitted for frozen section showed a multicystic lesion with large cystic spaces lined by a single layer of flattened to cuboidal epithelium with bland hyperchromatic nuclei and occasional enlarged nuclei (Figures 2(a) and 2(b)). The malignant cells showed clear to eosinophilic cytoplasm, enlarged, hyperchromatic nuclei, prominent nucleoli, and hobnail morphology in areas (Figures 2(c) and 2(d)).
Immunohistochemical profile. Tumor cells are immunoreactive for AMACR, cytoplasmic staining (a), Napsin-A, cytoplasmic staining (b), and PAX-8, nuclear staining (c) (X400).
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Immunohistochemical stains were performed (Figure 3).