Preschool sarcoidosis mimicking juvenile rheumatoid arthritis: The significance of gallium scintigraphy and skin biopsy in the differential diagnosis

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Abstract
Preschool sarcoidosis occurring in children less than 6 years old is rare and characterized by the triad of skin, joint and eye manifestations without any pulmonary lesion. Because of similar clinical manifestations, the diagnosis of preschool sarcoidosis and juvenile rheumatoid arthritis (JRA) is confusing. A girl with preschool sarcoidosis, initially diagnosed and treated as having JRA, is reported here. Ophthalmologic examinations revealed posterior involvement of the eye. A gallium scintigram of the head showed panda appearance. Biopsy of the cutaneous lesion demonstrated non-caseating granuloma. Gallium scanning may be an important clue to correct diagnosis.

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