Pigmented Villonodular Synovitis of the Ankle with Extensive Bone Involvement: A Case Report

We describe a case of a 49 year old man who presented with swelling of his left ankle for two months. After standard X-ray, ultrasound investigation, MRI and histological examination, the patient was diagnosed with pigmented villonodular synovitis and bone involvement of the ankle. A complete resection of the tumour was performed. A large bone defect after the resection was filled with cancellous bone graft. In pigmented villonodular synovitis, symptoms are often remarkably discrete for long periods. The course of the disease is slow, but progressive and destructive. This warrants awareness of this entity, early diagnosis, and aggressive management.