P43.04: The mean gray value of VOCAL technique can assist in making differential diagnosis of chocolate cyst and other benign ovarian tumor: a preliminary study

Objectives: The first aim was to compare the effectiveness of power Doppler ultrasound with VOCAL technique as an aid in preoperative distinguishing of chocolate cyst (endometrioma) and other benign ovarian tumor. Materials and methods: Eight-seven patient previously diagnosed with benign ovarian tumors received transvaginal, transrectal or transabdominal ultrasounds before they had conservative or operative treatment. Six basic parameters were measured including tumor volume (TV), mean gray value (MGV), vascularity index (VI), flow index (FI), vascularity/flow index (VFI) and serum CA125. VOCAL technique was applied to all patients. After the operations, the data of six parameters were analyzed between two groups. Group 1 was pathologically diagnosed as benign ovarian tumors (serous cystadenoma, mucinous cystadenoma or dermoid cyst) and Group 2 was chocolate cyst. The t test was applied. Results: Sixty-nine patients received laparoscopic tumor resection or laparotomy and 18 patients decided to take regular outpatient follow-up instead of operation. Among 69 patient receiving operations, 43 patients were pathologically diagnosed as chocolate cyst or endometrioma and 26 patients were other benign ovarian tumors including serous cystadenoma, mucinous cystadenoma, dermoid cyst, etc. The MGV was significantly lower in patients with chocolate cyst compared to those with other benign ovarian tumors (P = 0.038). There were no significant correlations between volume, MGV and CA125 in the chocolate cyst group. Conclusion: This study is still ongoing and the present data is preliminary. However, it seems that MGV of VOCAL technique can assist us in making differential diagnosis of chocolate cyst and other benign ovarian tumors.