A 35 yr old woman presents with primary infeility. On examination a mass is palpable in the pelvis. USG shows a cystic lesion in the ovary with ground glass appearence without internal vascular flow. Her CA-125 level is 90 U/ml. What is the most likely diagnosis?
**Core Concept**
The question tests the student's ability to diagnose ovarian pathology based on clinical presentation, ultrasound findings, and tumor marker levels. The key concept here is the differentiation between benign and malignant ovarian tumors, particularly in the context of primary infertility and elevated CA-125 levels.
**Why the Correct Answer is Right**
The patient's presentation with primary infertility and a palpable pelvic mass, along with ultrasound findings of a cystic ovarian lesion with ground glass appearance and no internal vascular flow, is suggestive of a benign ovarian tumor. The elevated CA-125 level is concerning for malignancy, but the ultrasound features and clinical context point towards a benign diagnosis. The most likely diagnosis is a mature teratoma, also known as a dermoid cyst, which is a type of benign ovarian tumor that can present with ground glass appearance on ultrasound due to the presence of sebaceous material.
**Why Each Wrong Option is Incorrect**
**Option A:** Malignant ovarian tumor - While the elevated CA-125 level raises concern for malignancy, the ultrasound features and clinical context are not typical for a malignant ovarian tumor.
**Option B:** Endometrioma - Endometriomas typically present as solid or complex cystic lesions with internal vascular flow on ultrasound, which is not consistent with this patient's presentation.
**Option C:** Ovarian cystadenoma - Ovarian cystadenomas are typically simple cystic lesions without the ground glass appearance or elevated CA-125 levels seen in this patient.
**Option D:** Krukenberg tumor - Krukenberg tumors are metastatic malignancies to the ovary, usually from a gastric primary, and typically present with bilateral ovarian involvement and a more complex ultrasound appearance.
**Clinical Pearl / High-Yield Fact**
A ground glass appearance on ultrasound is often seen in benign ovarian tumors, particularly dermoid cysts, due to the presence of sebaceous material. This feature, combined with a lack of internal vascular flow and a palpable pelvic mass, can help differentiate benign from malignant ovarian tumors.
**Correct Answer:** C. Ovarian cystadenoma