The molecular basis for the relationship between EFH and benign fibrous histiocytoma has remained largely unknown, with some authors suggesting that EFH represents an entity that is biologically distinct from benign fibrous histiocytoma. [journals.lww.com]

The clinical appearance of the lesion suggested the possibility of a neoplasm of soft tissues. [ncbi.nlm.nih.gov]

Chronic irritation, continuous trauma and spontaneous development have been reported for those located within the oral cavity. [ncbi.nlm.nih.gov]