case_images: PMC11027916_01
case_images: CT of the abdomen and pelvis demonstrating the pelvic mass and large ascites.
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case_images: CT of the abdomen and pelvis revealed a large 21.0*12.7*26.0 cm mass with diffuse, large-volume ascites (Figure 1).
case_images: A ruptured 25 cm right ovarian neoplasm was found at the time of surgery.
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case_images: The findings at the time of surgery were as follows: the pelvic cavity was filled with mucinous ascites and jelly like substances, and a 25 cm long right ovarian neoplasm was observed (Figure 2), a 10 cm long left ovarian neoplasm, a grossly normal cervix, and a uterus.
case_images: Immunohistochemical staining of GAS. Histologic ((A) hematoxylin and eosin staining) and immunohistochemical (B-D) findings. (A) The tumor shows gastric-type differentiation with abundant clear or pale, eosinophilic cytoplasm with atypical nuclei. (B and C) Immunohistochemical staining for MUC6 and CEA was positive. (D) P53, wild type.
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case_images: Immunohistochemical staining of both the primary and the metastasized tumor was positive for CK7, MUC6, PAX-8 CEA, and P53 (wild type) and negative for CDX2, CK20, ER, PR, p16, and WT1 (Figure 3).
case_images: Immunohistochemical staining of squamous cell carcinoma (A) A high-grade squamous intraepithelial lesion and microinvasive squamous cell carcinoma were found on the cervix. (B) P53 was the wild type. (C) Immunohistochemical staining was positive for P16 in squamous cell carcinoma and negative in GAS.
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case_images: Immunohistochemical staining revealed P16 and P53 (wild type) positivity, and the proliferative index (Ki-67) was 90% (Figure 4). 