Placental site nodule is an uncommon, benign, generally asymptomatic lesion of trophoblastic origin, which may often be detected several months to years after the tenancy from which it resulted. PSN usually presents as menorrhagia, intermenstrual bleeding or an abnormal pap smear. PSN is benign, but it is important to distinguish it from the other benign and malignant lesions like decidua, placental polyp, exaggerated placental site and placental site trophoblastic tumor and squamous cell carcinoma. Follow ups of typical PSNs do not show recurrence or malignant potential.

Left fallopian tube. Hematoxylin and eosin stain at 2× objective.

On immunohistochemical analysis Placental Site Nodule showing

Placental Site Nodule (PSN): An Uncommon Diagnosis with a Common Presentation

PDF) A Rare Case of Placental Site Trophoblastic Tumor

PDF] [Squamous cell carcinoma in situ of the cervix and placental site nodule: Case report].

PDF) Placenta Site Trophoblastic Tumor and Choriocarcinoma from Previous Cesarean Section Scar: Case Reports

File:Placental site nodule -- high mag.jpg - Wikimedia Commons

Pathology Outlines - Exaggerated placental site

Pathology Outlines - Epithelioid trophoblastic tumor