<unk>  is a rare, fast-growing tumor of the nervous system or soft tissue that occurs mainly in children, although cases have been reported in patients up to age 60.<unk> s may form in the head and neck, abdomen, perineum, scrotum, or limbs. Also called malignant<unk> . Malignant<unk>  (MEM) is a rare tumor of soft tissues or the CNS, which is composed of both neuroectodermal elements represented by ganglion cells and/or well-differentiated or poorly differentiated neuroblastic cells such as ganglioneuroma, ganglioneuroblastoma, neuroblastoma, peripheral primitive neuroectodermal tumors – PNET and one or more mesenchymal neoplastic elements, usually rhabdomyosarcoma . The most accepted theory suggests that this tumor arises from remnants of migratory neural crest cells and thus from the ectomesenchyme.
Ectomesenchymoma
Myxoid cyst
Neural fibrolipoma
Rhabdomyoma
Immature teratoma
Hamartoma
Neurofibroma
Angiomyofibroblastoma