Tenosynovial Giant Cell Tumor Showing Severe Bone Erosion in the Finger: Case Report and Review of the Imaging Findings and Their Significance

Tenosynovial giant cell tumor is a part of the spectrum of benign synovial proliferative lesions. The patients are usually adults and the peak incidence is the third to the fifth decades of life. The majority of these lesions occur in the hands and wrists. The characteristic MR imaging finding of tenosynovial giant cell tumor is hypointense signal intensity seen on T1and T2-weighted images. Osseous abnormalities associated with tenosynovial giant cell tumor include pressure erosion, cystic change and degenerative change (1). However, severe bone involvement by tenosynovial giant cell tumor has infrequently been reported. This case report intends to describe tenosynovial giant cell tumor showing severe bone erosion and to review the literatures regarding bone lesions and their clinical significance such as the relationship between bone erosion and prognosis of tenosynovial giant cell tumor.