Benign cystic peritoneal mesothelioma incorrectly diagnosed as an ovarian borderline mucinous tumor of intestinal type at transvaginal preoperative ultrasound evaluation.

摘要

An asymptomatic 70-year-old woman, gravida 3 para 3, was referred after an incidental finding of a left ovarian mass. At ultrasound examination a multilocular ovarian cyst, size 56 x 31 x 40 mm, was diagnosed, with a very high number of locules and low-level cystic content. No solid component was identified within the cyst and the 'echogenic tissue' was interpreted, at dynamic examination, as an aggregation of septa. The diameter of the locules ranged between 7 and 15 mm. At color Doppler examination, only a few vessels were observed within the septa. The ultrasound examiner entertained a diagnosis of mutinous borderline ovarian tumor of intestinal type, even if the small dimensions of the lesion were inconsistent with the normal size of this pathological entity (Figure la). The right ovary was reported as having a normal appearance. No free fluid in the pouch of Douglas was observed. Tumor markers (CA125, CA19-9) were negative. The patient's gynecological history was negative.