A 32-year-old woman presents with severe dysmenorrhea, deep dyspareunia, and chronic pelvic pain. She has been trying to conceive for 18 months without success. Pelvic examination reveals a fixed, retroverted uterus and tender nodules in the posterior cul-de-sac. Which of the following is the most appropriate next step to confirm the suspected diagnosis?
- AAbdominal CT scan
- BDiagnostic laparoscopy with biopsy
- CPelvic MRI
- DTransvaginal ultrasound
Show the answer and why the others fail
Answer: B. Diagnostic laparoscopy with biopsy
- A
- CT imaging has poor sensitivity for detecting endometrial implants and is not recommended for the diagnosis of endometriosis; it is more useful for evaluating other pelvic pathology.
- B — correct
- Laparoscopy with direct visualization and histological confirmation is the gold standard for diagnosing endometriosis, especially in the presence of infertility and classic examination findings.
- C
- MRI can identify deep infiltrating endometriosis and endometriomas, but it is not the first-line confirmatory test; laparoscopy remains the definitive diagnostic procedure.
- D
- Transvaginal ultrasound can detect endometriomas (chocolate cysts) but has limited sensitivity for peritoneal implants and adhesions, making it insufficient to definitively confirm endometriosis.
TakeawayLaparoscopy with biopsy is the gold standard for diagnosing endometriosis, particularly in patients with infertility and classic physical examination findings.