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Table 2 Diagnostic criteria for primary peritoneal cancer (GOG)

From: Breast metastasis from pelvic high-grade serous adenocarcinoma: a report of two cases

1. Bilateral ovaries are normal size or swollen because of benign changes
2. Extraovarian lesions are larger than those on the surface of the ovary
3. Microscopically, the ovarian lesions meet one of the following:
  No lesion in ovary
  Lesion was confined to the superficial epithelium of the ovary without invasion of the stroma
  Lesions within the ovarian surface epithelium and stroma, but within 5 × 5 mm
  The lesion within the parenchyma of the ovary is within 5 × 5 mm regardless of the presence or absence of lesions on the surface of the ovary
4. The histological and cytological features of the tumor are similar or identical to serous adenocarcinoma of the ovary
  1. GOG Gynecologic Oncology Group