title: [Recurrent renal colic with passing of horny lamellae. A rare differential diagnosis of renal calculi].
abstract: A 64-year-old man reported left-sided renal colics recurring regularly every 5-10 months for the past 25 years. After a typical colic urinary sediment was found to contain brownish, flaky elastic material which histologically consisted of nucleus-free keratoid lamellae. Calcium concentration in serum and urine was normal, as were the serum parathormone (215 pg/l) and inorganic phosphate levels. The intravenous pyelogram revealed a polycyclicly circumscribed filling defect (15 x 20 mm) in the left renal pelvis. At ureteroscopy a lamellar brown-grey tumour was identified which arose from the medial wall of the pelvis. Histological examination demonstrated hyper- and parakeratotic hornified squamous epithelium without malignant degeneration. This finding suggested a cholesteatoma originating from squamous epithelial metaplasia. The tumour was removed endoscopically and the renal wall coagulated by laser, a procedure repeated after 3 months. The patient has been free of symptoms for 3 years.
authors.affiliation: Medizinische Abteilung, Städtischen Krankenhauses Bogenhausen.
authors.forename: H
authors.initials: H
authors.lastname: Kremer
authors.forename: A
authors.initials: A
authors.lastname: Schilling
authors.forename: R
authors.initials: R
authors.lastname: Bassermann
mesh_terms: D002781:Cholesteatoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D003085:Colic / Q000175:diagnosis* / Q000209:etiology; D003937:Diagnosis, Differential; D004724:Endoscopy; D005500:Follow-Up Studies; D006801:Humans; D007669:Kidney Calculi / Q000175:diagnosis*; D007674:Kidney Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D017075:Laser Coagulation; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D014567:Urography
vernacular_title: Rezidivierende Nierenkoliken mit Abgang von Hornlamellen. Eine seltene Differentialdiagnose zur Nephrolithiasis.