Abstract
In this study, we report a very rare case of giant cell tumor (GCT) of the tendon sheath and vascular leiomyoma in the same finger. The patient was a 39-year-old man. On his first visit to our hospital, he conplained of pain in an elastic hard mass which was palpable at the left index-finger tip. Plain radiograph showed bone destruction of the distal and middle phalanges. We performed en bloc resection of the tumor. The results of post-operative histological examination indicated GCT of the tendon sheath. Seven months after the surgery, a new lesion was identified on the more proximal side of the same index-finger. Plain radiograph revealed pressure erosion at the proximal phalanx. We suspected reccurrence of the GCT of the tendon sheath, and performed excision of the tumor. To our surprise, the pathological diagnosis was not GCT of the tendon sheath, but vascular leiomyoma. This means that, histologically, a comparatively different soft tissue tumor had grown at the same finger. To our knowledge, double mesenchymal tumor is very rare, and no case of double mesenchymal tumor arising in the same finger has been reported before.
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