Adel Ebrahimpour - Department of Orthopedic Surgery, Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran- Physiotherapy Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mehrdad Sadighi - Department of Orthopedic Surgery, Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Meisam Jafari Kafiabadi - Department of Orthopedic Surgery, Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mohammadreza Chehrassan - Department of Orthopedic Surgery, Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Farsad Biglari - Department of Orthopedic Surgery, Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Pigmented villonodular synovitis (PVNS) is a locally destructive benign lesion usually affecting the synovial tissue ofweight-bearing joints. Herein we reported a ۲۰-year-old male patient who was an army staff with a foot lesion which waspainful in army boots. In the beginning, the lesion was considered a ganglion cyst. Further investigations revealed corticalerosion of cuboid bone on the radiograph. Pigmented villonodular synovitis was considered as a probable diagnosisafter observation of low signal lesion around the calcaneocuboid joint on both T۱ and T۲ images of Magnetic ResonanceImaging. The treatment included excision of the lesion and synovectomy of the calcaneocuboid joint. The diagnosis wasconfirmed with histological studies. At more than one year follow-up, the patient was completely asymptomatic, and therewas no evidence of recurrence. This study aimed to raise the awareness of clinicians about the diagnosis of this rare softtissue neoplasm which might be misdiagnosed as a ganglion or synovial cysts in the hindfoot zone.Level of evidence: V

Pigmented Villonodular, Soft Tissue Neoplasms, Synovitis, Tarsal Joints