GIANT-CELL TUMOR OF THE TENDON SHEATH - MR FINDINGS IN 9 CASES

OBJECTIVE. The purpose of this study was to determine the MR findings in patients with giant cell tumors of the tendon sheath. MATERIALS AND METHODS. MR imaging findings in nine surgically proved cases of giant cell tumors of the tendon sheath were evaluated on both T1- and T2-we ighted images. Of nine lesions, three involved the foot, two involved the thumb, two involved the knee, one involved the proximal part of th e tibia, and one involved the proximal part of the femur. RESULTS. All nine lesions were hypointense on T1-weighted images; the signal inten sity of most of the tumors was approximately equal to that of skeletal muscle. On the T2-weighted images, three lesions were hypointense rel ative to skeletal muscle, two lesions were approximately isointense re lative to skeletal muscle, and two lesions were slightly hyperintense relative to skeletal muscle but hypointense relative to fat. The remai ning two lesions had a more heterogeneous appearance on T2-weighted im ages. CONCLUSION. On both T1- and T2-weighted images, giant cell tumor of the tendon sheath has a signal intensity similar to that of its pa thologic counterpart, pigmented villonodular synovitis. The decreased signal intensity on both T1- and T2-weighted images is an uncommon app earance of extraarticular soft-tissue masses, in particular when they occur in the hands or feet, and this may suggest the diagnosis of gian t cell tumor of the tendon sheath.