Inclusion Body Fibromatosis

**Semantic type:** Neoplastic Process

**Definition:** A benign myofibroblastic neoplasm that affects young children and is characterized by the presence of neoplastic spindle cells and intracytoplasmic eosinophilic spherical inclusions. It arises from the soft tissues of the digits or extradigital areas including the extremities, breasts, and tongue.

**Synonyms:** - Digital Fibrous Tumor of Reye - Infantile Digital Fibroma/Fibromatosis - Infantile Digital Fibromatosis - Reye Tumor - Reye's Tumor