An unusual case of cat-scratch disease of the knee: case report and differential diagnosis.
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.
Schiettecatte
A
A
Department of Radiology, Universitair Ziekenhuis Brussel UZB, Jette, Belgium.
Shahabpour
M
M
Vanhoenacker
F M
FM
Goossens
A
A
Pouliart
N
N
Machiels
F
F
de Mey
J
J
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
D003287:Contrast Media