[Microscopic polyangiitis accompanied by interstitial pneumonia and abducens palsy].

A 69-year-old man was referred to our hospital with fever. Interstitial pneumonia and right pleural effusion were noted with elevated MPO-ANCA. Video-assisted thoracoscopic lung biopsy was performed and UIP -like histology was obtained. His symptoms and chest X-ray finding improved with administration of prednisolone and cyclosporine, but ten months later diplopia appeared. He had right abducens palsy and impaired perception in the first right trigeminal branch area, and we diagnosed mononeuritis multiplex due to microscopic polyangiitis.