<unk> l cells found outside inner lining of the uterus are called<unk> l cells or<unk> . This condition was first described in 1971 by Walker and the name<unk> ' was coined by Tausig. While<unk>  is most commonly seen during pregnancy, it rarely occurs in non-pregnant women, accompanied by bleeding and pain. Generally,<unk>  has no clinical symptoms, but it sometimes manifests as abdominal pain in pregnancy.<unk>  most commonly occurs the ovary, cervix and serosal lining of the uterus. It rarely occurs in peritoneum also. In the peritoneum,<unk>  is formed due to metaplasia of subserosal stromal cells under the influence of progesterone. It regresses within 4–6 weeks after childbirth. Therefore, no treatment is needed for this condition. However, it is necessary to differentiate<unk> sis from metastatic cancers and mesothelioma.
Ectopic decidua
Cryptic pregnancy
Interstitial pregnancy
Chronic deciduitis
Heterotopic pregnancy
Uterine septum
Ovarian pregnancy
Cervical pregnancy