Pair each distinct clinical presentation of a gynecologic neoplasm with its most defining molecular defect or characteristic histopathologic hallmark.
- A 58-year-old nulligravid woman with a BMI of 39 develops postmenopausal bleeding. Endometrial sampling reveals a well-differentiated endometrioid adenocarcinoma.Inactivation of the PTEN tumor suppressor gene
- A 71-year-old multiparous woman with a normal BMI presents with spotting. Biopsy reveals a high-grade uterine malignancy with complex papillary architecture and marked nuclear atypia.TP53 mutations resulting in aberrant p53 protein accumulation
- A 42-year-old woman with a family history of early-onset ascending colon cancer in her father presents with abnormal uterine bleeding and is diagnosed with endometrioid carcinoma.Germline mutation in a DNA mismatch repair gene causing microsatellite instability
- A 22-year-old woman presents with pelvic pain and a large, solid adnexal mass. Laboratory workup reveals markedly elevated lactate dehydrogenase (LDH) but normal alpha-fetoprotein and beta-hCG.Presence of isochromosome 12p and 'fried egg' cells on histology
- A 29-year-old woman presents with progressive hirsutism, deepening of her voice, clitoromegaly, and a solid unilateral ovarian mass on transvaginal ultrasound.Secretion of androgens by cells containing intracytoplasmic Reinke crystals
Cevap
The correct answer matches Type I endometrial cancer with PTEN inactivation, Type II serous cancer with TP53 mutations, Lynch syndrome-associated cancer with mismatch repair defects, dysgerminoma with isochromosome 12p, and Sertoli-Leydig cell tumors with Reinke crystals.
This question requires the synthesis of clinical vignettes with the molecular and histologic hallmarks of major gynecologic malignancies.
Type I endometrial carcinoma (endometrioid) is estrogen-dependent, occurring typically in obese, perimenopausal/postmenopausal women, and is classically driven by PTEN tumor suppressor gene inactivation.
Type II endometrial carcinoma (serous) is estrogen-independent, occurs in older, often thin women, and is aggressively driven by TP53 mutations.
Lynch syndrome (HNPCC) presents with synchronous or metachronous colon and endometrial cancers due to germline mutations in DNA mismatch repair (MMR) genes (e.g., MLH1, MSH2), leading to microsatellite instability.
Dysgerminoma is an ovarian germ cell tumor in young women characterized by elevated LDH, the presence of isochromosome 12p, and uniform cells with clear cytoplasm ('fried egg' appearance).
Sertoli-Leydig cell tumors are ovarian sex cord-stromal tumors that secrete androgens, causing rapid virilization (hirsutism, clitoromegaly, voice deepening) and are histologically identified by Reinke crystals.
### Endometrial Carcinoma Comparison
Type I endometrial carcinoma (endometrioid) is estrogen-dependent, occurring typically in obese, perimenopausal/postmenopausal women, and is classically driven by PTEN tumor suppressor gene inactivation.
Type II endometrial carcinoma (serous) is estrogen-independent, occurs in older, often thin women, and is aggressively driven by TP53 mutations.
Lynch syndrome (HNPCC) presents with synchronous or metachronous colon and endometrial cancers due to germline mutations in DNA mismatch repair (MMR) genes (e.g., MLH1, MSH2), leading to microsatellite instability.
Dysgerminoma is an ovarian germ cell tumor in young women characterized by elevated LDH, the presence of isochromosome 12p, and uniform cells with clear cytoplasm ('fried egg' appearance).
Sertoli-Leydig cell tumors are ovarian sex cord-stromal tumors that secrete androgens, causing rapid virilization (hirsutism, clitoromegaly, voice deepening) and are histologically identified by Reinke crystals.
### Endometrial Carcinoma Comparison
| Feature | Type I (Endometrioid) | Type II (Serous) |
|---|---|---|
| Clinical Profile | Obese, unopposed estrogen | Thin, older, multiparous |
| Genetics | PTEN, KRAS, MSI | TP53 mutations |
| Precursor | Atypical hyperplasia | Endometrial intraepithelial carcinoma |
| Prognosis | Favorable | Aggressive |
Adım Adım Çözüm
Anahtar Kavram
Molecular pathogenesis and histologic hallmarks of endometrial and ovarian neoplasms
Tahmini Süre:2m 30s