ECTOPIC DECIDUA MIMICKING METASTATIC LESIONS AND PERITONEAL TUBERCULES; DECIDUOSIS

İngilizce (OpenAlex)

AİM: Decidual cell groups outside the endometrium, "ectopic decidua" or "deciduosis", are commonly seen in the ovary and cervix. However, peritoneal localization is rare. Peritoneal deciduosis is usually an incidental histological finding in the form of white-yellow nodules resembling tuberculosis. Peritoneal deciduosis is macroscopically similar to peritoneal carcinomatosis and peritoneal tubercles, and microscopically may pose diagnostic difficulties with deciduoid mesothelioma, metastatic carcinoma and metastatic malignant melanoma. The purpose of this case report is to evaluate the clinical and histopathological features of ectopic decidua, which was detected as an incidental finding in the peritoneum and omentum during a cesarean section in our clinic, as it may mimic malignancy. CASE: Multiple gray-white colored, raised nodules, the largest of which was 1 cm, were observed in the bladder peritoneum and omentum during laparotomy. Biopsies were taken from the peritoneum and omentum for histopathological examination. The pathological diagnosis was reported as deciduosis. CONCLUSION: Although these lesions that we encountered during our laparotomies resemble metastatic malignant lesions and peritoneomental tubercles macroscopically, ectopic decidual tissue due to pregnancy is a benign lesion and resolves without any treatment in the postpartum period, and therefore should be kept in mind in the differential diagnosis when we encounter such lesions.