Abstract
BackgroundTo analyze the characteristic features of deep fibromatosis on conventional and diffusion-weighted MR images.ResultThe lesions were growing along the musculoaponeurotic fascia, mostly invaded the muscles, and showed ill-defined margins, low T2 signal bands and areas, and facial tail sign. Diffusion images showed mostly high or high mixed with low signal; only 2 lesions showed a persistent low signal. The average mean and minimum ADC values were 1.41 ± 0.26 × 10−3 mm2/s and 0.79 ± 0.43 × 10−3 mm2/s respectively. Post-contrast and DWI detected synchronous lesions and extensions missed on T1 and T2 images.ConclusionThe most frequent MR features of deep fibromatosis are low T2 signal bands and areas, fascial tail sign, ill or partially defined margins, and predominant restricted diffusion pattern in addition to areas of “T2-blackout effect.” Post-contrast and DWI are more valuable in local staging of the tumor.
Highlights
To analyze the characteristic features of deep fibromatosis on conventional and diffusion-weighted Magnetic resonance (MR) images
Deep fibromatosis represents the subtype of these soft tissue neoplasms arising at the intermuscular facial planes
Desmoid-type fibromatoses (DF) are defined according to the 2013 version of the WHO classification as “clonal fibroblastic proliferations that arise in the deep soft tissues and are characterized by infiltrative growth and a tendency toward local recurrence but an inability to metastasize.”
Summary
To analyze the characteristic features of deep fibromatosis on conventional and diffusion-weighted MR images. Desmoid-type fibromatoses (DF) are defined according to the 2013 version of the WHO classification as “clonal fibroblastic proliferations that arise in the deep soft tissues and are characterized by infiltrative growth and a tendency toward local recurrence but an inability to metastasize.”. According to their biologic behavior, they are classified as intermediate (locally aggressive) malignancy [3]. The role of imaging is mainly to describe the anatomical location, the local extent of the lesion, and its relationship to adjacent structures, especially vital ones as vessels and nerves. Monitoring the progress of lesion growth is another value for imaging, especially in cases addressed to an initial watchful waiting policy [1, 4]
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