DOI: https://doi.org/10.36347/sjmcr.2025.v13i03.051

Pages: 538-537

Ectopic decidua is the presence of decidual tissue outside the uterus. Pregnancy related peritoneal ectopic decidual reaction develops due to the effect of progesterone. Decidual reaction is a benign condition and can regress spontaneously in the postpartum period. Peritoneal nodules grossly mimic metastatic disease and granulomas. It is important to diagnose these lesions as they do not require therapeutic intervention. Histopathological examination of biopsies sampled during cesarean sections, tubal ligation etc. is necessary for the accurate diagnosis of this condition. We report a case of peritoneal ectopic decidual reaction and discuss its histopathological features and differential diagnosis.