A Case of Fibrous Hamartoma of Infancy

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  • Fibrous Hamartoma of Infancy の1例
  • 症例 Fibrous Hamartoma of Infancyの1例
  • ショウレイ Fibrous Hamartoma of Infancy ノ 1レイ

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Fibrous hamartoma of infancy (FHI) is a relatively rare subcutaneous soft tissue tumor in children. We report on a 1- year-old girl with a fibrous hamartoma on the right upper arm. The subcutaneous tumor was first noticed at the age of 5 months and had grown gradually. When the patient was 11 months old, hypertrichosis was noticed on the tumor surface. The tumor had a diameter of around 17 mm and was elastic hard. The surface of the mass was smooth, and its movability was good. The surgical resection was performed when the girl was 12 month old. Histopathologically, an organoid structure was apparent, consisting of mature fat tissue and complicating fibrous trabeculae, as well as an increased concentration of immature mesenchymal cells. The histological diagnosis was fibrous hamartoma of infancy (FHI). Five years and nine months after the operation, no recurrence has been noticed. We suggest that FHI should be included in a differential diagnosis of subcutaneous tumors in infants.

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