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Fibrous hamartomas of infancy(FHI) are rare, benign, fibroproliferative tumors which usually present in the first 2 years of life. They arise from the subcutanous tissue and usually appear as a single tumor in the axilla, shoulder, groin, digit, vulva, extremities, and trunk. Because of their pathologic findings, high degree of cellularity and the presence of immature cells, they can be erroneously diagnosed as malignant tumor and can lead to overtreatment of these benign disorder. This can be avoided by an awareness of the clinical and histologic characteristics of fibrous hamartomas of infancy. The authors present one case of fibrous hamartoma of infancy developed in the trunk of extensively large size which was successfully removed.