2026 Volume 62 Issue 4 Pages 901-905
Fibrous hamartoma of infancy (FHI) is a rare benign soft-tissue tumor that typically arises during early infancy. We report a case of FHI located in the suprapubic region of a 1-year-old boy. A faint bluish congenital nevus was noted at birth, and a firm subcutaneous nodule gradually became apparent beneath it by six months of age. Ultrasonography demonstrated a heterogeneously hyperechoic, ill-defined subcutaneous lesion, and MRI showed a poorly circumscribed mass with low T1 and high T2 signal intensities, suggesting a benign process. Because the mass enlarged slowly without spontaneous regression, it was completely excised, including the overlying nevus, at 17 months of age. Histopathological analysis revealed the characteristic triphasic pattern of mature adipose tissue, fibrous bundles, and immature mesenchymal cells, confirming FHI. FHI does not regress spontaneously and may enlarge until early childhood; therefore, surgical excision is recommended, with postoperative observation to monitor for rare local recurrence.
