Jelinek J S, Kransdorf M J, Shmookler B M, Aboulafia A A, Malawer M M
Department of Radiology, Washington Hospital Center, Washington, DC 20010.
AJR Am J Roentgenol. 1994 Apr;162(4):919-22. doi: 10.2214/ajr.162.4.8141018.
The purpose of this study was to determine the MR findings in patients with giant cell tumors of the tendon sheath.
MR imaging findings in nine surgically proved cases of giant cell tumors of the tendon sheath were evaluated on both T1- and T2-weighted images. Of nine lesions, three involved the foot, two involved the thumb, two involved the knee, one involved the proximal part of the tibia, and one involved the proximal part of the femur.
All nine lesions were hypointense on T1-weighted images; the signal intensity of most of the tumors was approximately equal to that of skeletal muscle. On the T2-weighted images, three lesions were hypointense relative to skeletal muscle, two lesions were approximately isointense relative to skeletal muscle, and two lesions were slightly hyperintense relative to skeletal muscle but hypointense relative to fat. The remaining two lesions had a more heterogeneous appearance on T2-weighted images.
On both T1- and T2-weighted images, giant cell tumor of the tendon sheath has a signal intensity similar to that of its pathologic counterpart, pigmented villonodular synovitis. The decreased signal intensity on both T1- and T2-weighted images is an uncommon appearance of extraarticular soft-tissue masses, in particular when they occur in the hands or feet, and this may suggest the diagnosis of giant cell tumor of the tendon sheath.
本研究旨在确定腱鞘巨细胞瘤患者的磁共振成像（MR）表现。
对9例经手术证实的腱鞘巨细胞瘤患者的MR成像表现进行了T1加权像和T2加权像评估。9个病灶中，3个位于足部，2个位于拇指，2个位于膝部，1个位于胫骨近端，1个位于股骨近端。
所有9个病灶在T1加权像上均呈低信号；大多数肿瘤的信号强度与骨骼肌大致相等。在T2加权像上，3个病灶相对于骨骼肌呈低信号，2个病灶相对于骨骼肌大致等信号，2个病灶相对于骨骼肌呈轻度高信号但相对于脂肪呈低信号。其余2个病灶在T2加权像上表现更为不均质。
在T1加权像和T2加权像上，腱鞘巨细胞瘤的信号强度与其病理对应物色素沉着绒毛结节性滑膜炎相似。T1加权像和T2加权像上信号强度降低是关节外软组织肿块不常见的表现，尤其是当它们发生在手或足部时，这可能提示腱鞘巨细胞瘤的诊断。
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