Subcutaneous and musculoskeletal sparganosis: imaging characteristics and pathologic correlation.
Cho, JH; Lee, KB; Yong, TS; Kim, BS; Park, HB; Ryu, KN; Park, JM; Lee, SY; Suh, JS
Skeletal radiology, 29(7):402-408, 2000
OBJECTIVE: To document the imaging characteristics of subcutaneous and musculoskeletal sparganosis.
DESIGN AND PATIENTS: Ten patients with musculoskeletal sparganosis were examined, with a variety of imaging modalities including MRI (n=6), ultrasonography (n=8), plain radiography (n=7) and CT (n=1). Pathologic correlation was carried out in all cases.
RESULTS: Nine lesions involved soft tissues, of which seven were in the thigh, two in the trunk and one involved a vertebral body. The majority of the lesions in soft tissue were confined to the subcutaneous layer but two extended deep into underlying muscles. Sonography revealed low-echoic serpiginous tubular tracts (8/8), and an intraluminal echogenic structure (4/8). MRI revealed multiple serpiginous tubular tracts and peripheral rim enhancement. Two patients showed perilesional soft tissue edema. Pathologically, the lesion consisted of a larva surrounded by three layers of inflammation: an inner epithelioid granulomatous cell layer, middle chronic inflammatory cell layers, and an outer fibrous layer.
CONCLUSION: The study suggests that if serpiginous tubular tracts are seen at imaging studies, musculoskeletal sparganosis should be included in the differential diagnosis.
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