Timor-Tritsch IE, et al. - In this retrospective study, researchers examined whether a new sonographic pattern to describe a novel, yet typical, microcystic pattern of papillary projections, solid components and/or septa could be used as a new ultrasound marker of borderline ovarian tumors (BOTs). Further, they presented their histologic confirmation. The final analysis included 67 cases with a histologic diagnosis of BOT following surgical resection who underwent pre-operative transvaginal ultrasound. The majority of both the serous and the mucinous BOT cases showed the novel sonographic marker of BOTs termed “microcystic pattern” of their papillary projections, solid components and/or septa. Importantly, the microcystic appearance seems to be unique to BOTs when they compared sonographic images and histopathology of both benign entities and malignancies. No previous reports regarding such or similar description was identified. This new marker seems to have utility for correctly recognizing BOTs, distinguishing them from ovarian cancers and benign ovarian pathologies, and assuring their appropriate clinical and surgical management.