title: Appendiceal cystadenoma mimicking a cystic renal mass.
abstract: We report the first case of appendiceal mucinous cystadenoma associated with the kidney. A 57-year-old man with chronic renal failure presented with a right renal mass. During laparoscopic nephrectomy, frozen analysis of a tubular structure extending from the mass showed appendiceal tissue. The mass, appendix, and what was believed to be the right kidney were removed. Pathologic examination demonstrated mucinous cystadenoma of the appendix. No renal tissue was identified, but the patient refused further treatment. This case demonstrates that mucinous cystadenomas arising from retroperitoneal structures might mimic renal neoplasms and should be considered in the differential diagnosis of cystic renal masses.
authors.affiliation: Brady Urological Institute, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA.
authors.forename: J Kellogg
authors.initials: JK
authors.lastname: Parsons
authors.forename: Paul D
authors.initials: PD
authors.lastname: Freeswick
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Jarrett
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000556:secondary; D001063:Appendiceal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D002292:Carcinoma, Renal Cell / Q000556:secondary; D018291:Cystadenoma, Mucinous / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D006801:Humans; D007676:Kidney Failure, Chronic / Q000150:complications; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000556:secondary