A 36-year-old woman presented with a mass on her labia that she first noticed two years earlier. The mass had recently started to bleed, requiring multiple pad changes per day. The patient reported pain with walking and sitting. She did not have trauma or surgery in the affected area. She was obese (body mass index of 40 kg per m²) and had a history of irregular menses.

The physical examination revealed a large pedunculated mass stemming from the left labium majus. The gelatinous polyp measured approximately 13 × 8 × 4 cm with a 2- × 2-cm stalk (Figure 1). The surface had areas of ulceration, erosion, and scaling. The pelvic examination was otherwise unremarkable. Ultrasonography revealed an echogenic, irregularly shaped lesion with vascularization and no evidence of peristalsis.

Question

Based on the patient's history and physical examination findings, which one of the following is the most likely diagnosis?

• A. Bartholin gland cyst.

• B. Canal of Nuck cyst.

• C. Fibroepithelial stromal polyp.

• D. Gartner duct cyst.

• E. Neurofibroma.