Subcutaneous Endosalpingiosis of the Buttock Without Prior Surgery or Trauma: A Case Report and Literature Review

Endosalpingiosis is a rare, benign condition characterized by the presence of ectopic glandular epithelium that resembles the epithelium of the fallopian tubes. It typically affects the pelvic peritoneum and is often discovered incidentally. We present a rare case of subcutaneous endosalpingiosis localized in the left buttock of a 49-year-old woman with no history of surgery or trauma in the area. The patient presented with a palpable, painless subcutaneous mass that had been present for over 15 years and caused discomfort while sitting. Imaging and aspiration suggested a cystic lesion, and surgical excision was performed under local anesthesia. Histopathological examination confirmed the diagnosis of endosalpingiosis confined to the subcutaneous tissue. This report highlights the clinical and pathological features of this extremely rare presentation and discusses possible pathogenesis with reference to previously published literature.