Completely cystic masses Completely cystic masses. A: Longitudinal transabdominal sonogram of completely cystic mass. (RT OV, right ovary.) B: Same patient as in (A), 1 month later, demonstrating nearly complete resolution. C: Transabdominal sonogram of cystic right-adnexal mass (between +'s). D: Transvaginal sonogram (TVS) of (C), showing follicular cyst (between +'s) within right ovary with a thin wall. Surrounding ovarian tissue (arrow) is compressed by cyst. E: Transverse sonogram demonstrating predominantly cystic mass surrounding left ovary (arrow), representing a peritoneal cyst. F: Transvaginal sonogram of cystic mass with a small intraluminal projection (arrow) that represents an endosalpingeal fold within a hydrosalpinx. G: Transvaginal sonogram of luteal cyst demonstrating thicker wall than follicular cyst and rim of ovarian tissue containing several immature follicles (arrow) surrounding cyst. H: Transvaginal sonogram of ruptured hemorrhagic corpus luteum cyst (large arrow) surrounded by echogenic clotted blood in cul-de-sac (curved arrow). I: Thin septation (arrow) within a cystic mass. This was aspirated under TVS control without difficulty. J: Small excrescence within a mostly cystic mass. Benign cytology was found within the aspirate. K: Transvaginal sonogram of smooth-walled ovarian cyst. L: Same patient as in K after 5 weeks. There has been complete regression of the physiologic cyst. M: Hemorrhagic corpus luteum within the left ovary containing fibrin strands appearing as a web-like complex of thin, branching linear interfaces. N: Same patient as in M, 6 weeks later, showing complete regression. O: Completely cystic ovarian masses in a (left) peri-menopausal woman and (right) postmenopausal woman. While most small cystic ovarian masses in pre- and perimenopausal women are physiologic, most postmenopausal cysts are inclusion cysts. Source: SONOGRAPHIC EVALUATION OF PELVIC MASSES WITH TRANSABDOMINAL AND/OR TRANSVAGINAL SONOGRAPHY, Sonography in Obstetrics and Gynecology: Principles & Practice, 7e Citation: Fleischer AC, Toy EC, Lee W, Manning FA, Romero RJ. Sonography in Obstetrics and Gynecology: Principles & Practice, 7e; 2014 Available at: http://obgyn.mhmedical.com/DownloadImage.aspx?image=/data/books/1414/fle_ch31_f001d.png&sec=76395778&BookID=1414&ChapterSecID=76395760&imagename= Accessed: October 19, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved