Primary signet-ring cell carcinoma of the renal pelvis: An autopsy case.

Introduction: Signet-ring cell carcinoma is an extremely rare histological variant of upper urinary tract carcinoma, associated with poor prognosis.

Case Presentation: We report a case of a 75-year-old female diagnosed with left primary upper urinary tract signet-ring cell carcinoma, initially treated with surgery. Post-surgical development of multifocal metastases was followed by a devastating clinical course.