title: Neurofibromatosis, factor IX deficiency, and rhabdomyosarcoma.
abstract: A paratesticular rhabdomyosarcoma occurred in a child with factor IX deficiency and neurofibromatosis, illustrating the need to consider carefully the various etiologic possibilities of a soft-tissue mass in a child with neurofibromatosis and/or a bleeding disorder.
mesh_terms: D004200:Diseases in Twins; D005834:Genital Neoplasms, Male / Q000097:blood; D002836:Hemophilia B / Q000150:complications*; D006801:Humans; D007223:Infant; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000097:blood*; D009456:Neurofibromatosis 1 / Q000097:blood*; D012208:Rhabdomyosarcoma / Q000097:blood*; D012878:Skin Neoplasms / Q000097:blood