Acute-onset sarcoidosis with polyarthralgia and hilar lymphadenopathy.

A 33-year-old man was admitted to our hospital because of fever and arthralgia. Radiographic findings revealed bilateral hilar lymphadenopathy (BHL) and enlargement of lymph nodes of the mediastinum. Tissue from a mediastinum lymph node showed noncaseating granulomas. An acute form of sarcoidosis, Lofgren's syndrome, was diagnosed. Prednisolone was administered. Because this syndrome is rare in Japan, histopathological examination was necessary to diagnose and treat this patient.