A 37-years old male patient with deep ankle pain due to localised lateral talar OCD underwent anterior ankle arthroscopy. In the anterior working space a loose body was found. After resection, the procedure was continued to treat the OCD.

Diagnosis: Pigmented Villonodular Synovitis or Pigmented Giant Cell Tumour.

Picture 1: A large loose body (arrow) was coincidentally found during an anterior ankle arthroscopy.

Picture 2: Macroscopic view of resected loose body (1.2 x 1 x 1 cm.)