case_images: PMC5301128_01
case_images: Ultrasonographic view.
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case_images: F1
case_images: Transvaginal ultrasonography revealed a 106 x 113-mm cystic mass mimicking an endometrioma; the unilocular cyst yielded diffuse homogeneous ground-glass echoes (Fig. 1).
case_images: Computerized tomography scan.
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case_images: F2
case_images: Pelvic computed tomography revealed a 118 x 78 x 85-mm septate cystic lesion characterised by high lipid content, nodular components, and focal wall calcification (Fig. 2).
case_images: Frozen section material.
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case_images: F3
case_images: Left salpingo-ovariectomy was performed, and the mass subjected to frozen sectioning (Fig. 3).
case_images: Foci of squamous cell carcinoma. HE. x5.
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case_images: F4
case_images: A well-differentiated squamous cell carcinoma appears to arise from benign squamous epithelium (Fig. 4, Fig. 5).
case_images: Atypical mitotic figures and giant cells with storiform pattern-clustered and scattered polygonal cells to spindle cells with markedly pleomorphic characteristics (inflammatory cell infiltration).
case_images: cro-0010-0098-g06.jpg
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case_images: F6
case_images: Multinucleated giant cells, scattered cells that were polygonal-to-spindle-like in shape (and markedly pleomorphic in their characteristics), and unusual tumour cells were evident (Fig. 6, Fig. 7).
case_images: Cells show CD68 positivity on immunohistochemistry.
case_images: cro-0010-0098-g08.jpg
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case_images: F8
case_images: The tumour cells were negative for desmin, smooth muscle actin, and myogenin, but positive for CD68 (Fig. 8).