title: Decidua and squamous metaplasia in abdominopelvic lymph nodes.
abstract: We describe two variants of benign para-aortic lymph nodal inclusions that mimic squamous cell carcinoma. The first, a decidual reaction, occurred in a 27-year-old pregnant woman with squamous cell carcinoma of the cervix. The second, a squamous metaplasia of ectopic müllerian-type glands, was present in a 63-year-old woman with squamous cell carcinoma of the anus. Intranodal decidua has been described, but squamous metaplasia of glandular inclusions has not been previously reported. Müllerian-type nodal inclusions are reviewed, and histologic features distinguishing decidua and squamous metaplasia from carcinoma are discussed.
mesh_terms: D000005:Abdomen; D000328:Adult; D001005:Anus Neoplasms / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis / Q000473:pathology*; D003656:Decidua / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology*; D008206:Lymphatic Diseases / Q000175:diagnosis / Q000473:pathology; D008679:Metaplasia; D008875:Middle Aged; D010388:Pelvis; D011247:Pregnancy; D011252:Pregnancy Complications, Neoplastic / Q000473:pathology; D014594:Uterine Neoplasms / Q000473:pathology*