An obstetrician-gynecologist is evaluating a 58-year-old woman (gravida 3, para 3) who reports two weeks of daily vaginal spotting and a new sensation of pelvic pressure. Her last menstrual period was 7 years ago. She has a documented medical history of poorly controlled type 2 diabetes mellitus and a BMI of 36 kg/m². Pelvic examination identifies a firm, irregularly contoured mass in the left adnexa. Subsequent transvaginal ultrasound confirms a 7-cm complex left adnexal mass with both solid and cystic components, alongside an abnormally thickened endometrial echo complex measuring 11 mm. The physician prepares to perform an office endometrial biopsy as the critical next step. The differential diagnosis for her concurrent endometrial thickening and adnexal mass includes several distinct neoplastic processes. Match the following suspected gynecologic neoplasms with their underlying molecular drivers, pathognomonic histology, and defining clinical associations.
- Endometrioid endometrial carcinomaMalignant glandular proliferation commonly driven by PTEN mutations or mismatch repair (MMR) deficiency; major risk factors include obesity, nulliparity, and unopposed estrogen.
- High-grade serous ovarian carcinomaCharacterized by ubiquitous TP53 mutations and impaired homologous recombination; frequently originates from precursor lesions in the fallopian tube fimbriae.
- Granulosa cell tumor of the ovarySex cord-stromal neoplasm displaying Call-Exner bodies; secretes high levels of estrogen and inhibin, frequently causing concomitant endometrial hyperplasia.
- Krukenberg tumorCharacterized by mucin-secreting signet-ring cells within the adnexa; represents metastatic disease most commonly from a primary gastric malignancy.
- Clear cell ovarian carcinomaHistology shows 'hobnail' cells with abundant clear cytoplasm; pathogenesis is strongly linked to concurrent pelvic endometriosis rather than metabolic syndrome.