Introduction: Despite its low prevalence, giant cell tumor of tendon sheath (GCTTS) is considered as one of the most common benign tumors in the hand. GCTTS mostly affects tendon sheaths and finger joints; however, its presence in the wrist and Guyon canal is scarcely reported. Case Presentation: In this report, we describe the case of a 32-year-old female with signs and symptoms of ulnar tunnel syndrome in her right hand while the MRI illustrated a soft tissue mass in the Guyon canal. Excisional biopsy was performed, confirming the diagnosis of GCTTS. Conclusions: This report proposes the consideration of GCTTS as a differential diagnosis in patients suffering from ulnar tunnel syndrome. In addition, it could be concluded that an excisional biopsy might be considered as a therapeutic and diagnostic method in this disease.
Introduction: The knee is the most commonly affected joint in the pigmented villonodular synovitis (PVNS). If misdiagnosed or mismanaged, PVNS, especially the diffused form can destroy joints and can result in terminal degenerative joint disease. Case Presentation: We report 3 cases of diffuse form of PVNS with grade 3 osteoarhtritis that IS treated by total synovectomy and total knee arthroplasty (TKA). The mean duration of the follow-up was 46.5 (9, 11, 120) months. In 2 cases, staged posterior then anterior synovectomy and TKA were done with excellent results. In 1 case, simultaneous synovectomy and TKA was performed with hematoma formation postoperatively and quadriceps tendon rupture 10 weeks later with fair final result. Conclusions: TKA in PVNS is a challenging procedure. We recommend open posterior synovectomy then anterior synovectomy and TKA in 2 separate operations. Quadriceps mechanism must be protected during synovectomy.
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