Focal myositis of unilateral leg.

[focal myositis]

Focal myositis is a rare , benign inflammatory pseudotumor of the skeletal muscle of unknown etiology . In Korea , there is no case report of focal myositis , which is not combined with connective tissue disease . We present an unusual case of focal myositis with ankle contracture , involving more than two muscles . A 26 -year -old man visited our clinic complaining of right ankle contracture and leg muscle pain . Physical examination revealed no muscle weakness or any other neurological abnormality . T 2 -weighted magnetic resonance imaging of the right leg demonstrated diffuse high signal intensity of the right gastrocnemius , flexor digitorum longus , and tibialis anterior muscles . Needle electromyography showed profuse denervation potentials with motor unit action potentials of short duration and small amplitude from the involved muscles . All these findings suggested a diagnosis of focal inflammatory myositis and the patient was put under oral prednisolone and physical therapy .