A<unk>  is a cyst-like structure that appears in the pelvis due to non neoplastic reactive mesothelial proliferation, often as a consequence of prior episodes of pelvic inflammation, as can occur in pelvic inflammatory disease. It has the potential to mimic ovarian cysts, hydrosalpinx or even malignancy, due to its nonspecific anechoic appearance.
Peritoneal inclusion cyst
Paraovarian cyst
Mixed Müllerian tumor
Epididymal cyst
Corpus luteum cyst
Theca lutein cyst
Ovarian germ cell tumors
Heterotopic pregnancy