Figure 21a. Fallopian tube lesion simulating an exophytic ovarian cyst in a 28-year-old woman. CT scans show a large cyst in the right lower abdomen and upper pelvis. The dilated right ovarian vein is tracked to the cystic right ovary (Ov in b), which is seen to border the inferior part of the cyst. Thus, the cyst was thought to be an exophytic cystic ovarian neoplasm that was probably benign. At surgery, however, the cyst was found to arise from the fallopian tube and was strongly adherent to the ovary. It was considered to be a benign tubal cyst or an unusually large hydrosalpinx.