Imaging features of low-grade fibromyxoid sarcoma (Evans tumor).

Skeletal Radiology
Sinchun HwangMeera Hameed

Abstract

To determine common imaging features of low-grade fibromyxoid sarcoma (LGFMS), a rare subtype of fibrosarcoma with a benign histological appearance but with a propensity for local recurrence and metastasis. By review of medical records, 29 patients (14 males, 15 females) with mean age of 41 years (range, 11-64 years) with diagnosis of LGFMS and imaging available in PACS were identified. The study included radiography (9/29), ultrasound (1/29), CT (14/29), and MRI (22/29). Imaging features evaluated included anatomic site, and lesion size, number, location, US echogenicity, CT attenuation, calcifications, MR signal intensity pattern, and contrast enhancement. Twenty-two patients had imaging at initial diagnosis, and seven had imaging only at local recurrence. The majority of tumors (27/29) were deep in tissue, with mean size of 6.2 cm (range, 1.4-19.0 cm). Tumor was single at initial diagnosis and multiple at local recurrence; lower extremity was the most common site. On radiographs, tumor was visible in four of nine without bone erosion or calcification. Areas of CT attenuation hypodense to muscle were seen in 13/14 patients. Calcification was uncommon (3/14). On fluid-sensitive MRI sequences, the predominant signal intensity w...Continue Reading

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Mar 22, 2014·Japanese Journal of Radiology·Kyung Joon Kim, Jung Wook Seo
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