Solitary Fibrous Tumor of Scalp in a Child – A Rare Presentation in an Unusual Age

Abstract Solitary fibrous tumor (SFT), previously known as hemangiopericytoma, is a rare mesenchymal neoplasm usually arising from the pleura but can manifest anywhere in the body including the abdomen, meninges, trunk, extremities, and the head and neck. SFTs typically affect adults, with a peak incidence in the 5 th and 6 th decades of life. It is uncommon in pediatric population, especially in the head and neck. We present the case of a 6-month-old child presenting with gradually increasing painless scalp swelling in the occipital region. Magnetic resonance imaging suggested a likely diagnosis of soft-tissue sarcoma while histopathological examination revealed SFT with the differential diagnosis of deep fibrous histiocytoma, dermatofibrosarcoma protuberans, myofibroma, myopericytoma, fibromatosis, and nodular fasciitis. Our diagnosis was subsequently confirmed on immunohistochemistry by strong diffuse membranous CD34 positivity and negative desmin, myogenin, and pan-CK. This case report highlights an exceptionally rare presentation of SFT in an uncommon age group.