benign fibrous tissue tumor MR 2007英文电子书.pdfVIP

EDUCATION EXHIBIT 173 Pathologic and MR Imaging Features of Benign Fibrous Soft-Tissue Tumors in Adults1 Philip A. Dinauer, MD ● Clark J. Brixey, MD ● Joel T. Moncur, MD ONLINE-ONLY CME Julie C. Fanburg-Smith, MD ● Mark D. Murphey, MD See www.rsna .org/education /rg_cme.html. Benign fibrous (fibroblastic or myofibroblastic) soft-tissue tumors are a heterogeneous group of fibrous lesions with widely varied anatomic locations, biologic behavior, and pathologic features. The four broad LEARNING OBJECTIVES categories of fibrous proliferation are benign fibrous proliferations, fi- bromatoses, fibrosarcomas, and fibrous proliferations of infancy and After reading this article and taking childhood. The first two categories include nonaggressive fibroblastic the test, the reader will be able to: lesions such as nodular fasciitis, as well as fibromatoses that demon- Recognize MR im- strate more aggressive biologic behavior (eg, desmoid tumors). In aging characteristics adults, fibrous tumors are among the most common soft-tissue lesions that represent typical histopathologic fea- encountered in clinical practice. MR imaging can be useful for defining tures of benign fi- the intrinsic signal characteristics, size, and compartmental extension brous soft-tissue tu- mors. of these lesions. Histologic features of the tumor also may be depicted Describe typical on T2-weighted MR images. Hypocellular fibrous tumors with dense anatomic locations of benign fibrous prolif- collagenous components tend to have lower signal intensity on T2- erations such as