Purpose: To evaluate sonographic findings of fibrous hamartoma of infancy (FHI)
Materials and Methods: Pathologically confirmed five FHI were included in the study. We retrospectively reviewed the clinical presentation, the sonographic (n = 5) and CT (n = 3) findings and correlated with pathologic findings.
Results: Mean age was 14.8-months-old (range, 7 months - 3 years). Location was all in fat layer of back (n = 4) and arm (n = 1) with abutting the skin (n = 3). The lesions measured 31.2 mm in the longest diameter (range, 18 mm - 50 mm). Sonographic findings were purely solid, relatively well-defined, heterogeneous hyperechoic, and hypovacular in all cases. Internal architecture revealed 'layered' appearance (n = 3) and faint distal shadowing (n = 3). CT findings showed isoattenuation and homogeneous enhancement to muscle on both NECT (n = 3) and CECT (n = 2). None of the lesion revealed calcification or hypervascularity on both US and CT. Pathologic correlation demonstrated characteristic 'organoid' mixture of three tissue components of fibrous, mucoid, and fat.
Conclusion: FHI can be suggested by sonographic findings of superficially located, hypovascular, solid soft tissue mass with 'layered' appearance in back or arm of young children.