title: An unusual case of cat-scratch disease of the knee: case report and differential diagnosis.
abstract: We present a case of a 16-year-old boy with a painful swelling in the popliteal fossa, slight fever, articular and muscle pain of 3 weeks duration. Plain radiography and MR examination were performed in order to characterize the lesion. Additionally to the poorly defined mass, 2 satellite nodules were shown. Subsequent biopsy revealed a granulomatous process and 2 satellite lymphadenopathies highly suggestive of cat-scratch disease. This case shows that the differential diagnosis of a soft tissue mass of the knee should not only include tumoral processes or pseudotumoral lesions, but also granulomas from infectious or non-infectious origin. Knowledge of the patients contact with cats and the detection of skin scratches is usually the clue to the correct diagnosis.
authors: Department of Radiology, Universitair Ziekenhuis Brussel UZB, Jette, Belgium.
authors: A
authors: A
authors: Schiettecatte
authors: M
authors: M
authors: Shahabpour
authors: F M
authors: FM
authors: Vanhoenacker
authors: A
authors: A
authors: Goossens
authors: N
authors: N
authors: Pouliart
authors: F
authors: F
authors: Machiels
authors: J
authors: J
authors: de Mey
mesh_terms: D000293:Adolescent; D001706:Biopsy; D002372:Cat-Scratch Disease / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D003287:Contrast Media; D003937:Diagnosis, Differential; D006099:Granuloma / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D007717:Knee; D008279:Magnetic Resonance Imaging; D008297:Male
chemical_list: D003287:Contrast Media