The flea's knees: A unique presentation of cat scratch disease

A 4-year-old girl presented to the emergency department with right leg pain and associated limp for one day. There was no trauma or injury; she had no fever or recent illness. Her exam was notable for tenderness and swelling to the right knee, most prominent in the popliteal region. Initial laboratory testing was unremarkable except for a mildly elevated C-reactive protein. She had normal radiographs of the right lower extremity. A soft tissue ultrasound demonstrated popliteal lymphadenopathy, a rare finding in children.
Source: The American Journal of Emergency Medicine - Category: Emergency Medicine Authors: Source Type: research