MedGen

ALK-related neuroblastic tumor susceptibility is characterized by increased risk for neuroblastic tumors including neuroblastoma, ganglioneuroblastoma, and ganglioneuroma. Neuroblastoma is a more malignant tumor and ganglioneuroma a more benign tumor. Depending on the histologic findings, ganglioneuroblastoma can behave in a more aggressive fashion, like neuroblastoma, or in a benign fashion, like ganglioneuroma. Preliminary data from the ten reported families with ALK-related neuroblastic tumor susceptibility suggest an overall penetrance of approximately 57% with the risk for neuroblastic tumor development highest in infancy and decreasing by late childhood. [from GeneReviews]

A highly malignant embryonal tumor of infancy and young childhood characterized by neuroectodermal elements organized in distinctive multilayered rosettes. Ependymoblastomas are large lesions that occur in the supratentorial compartment, typically displaying a physical connection to the ventricular system. [from HPO]

A tumor that originates in cells from the primitive neural crest. This group of tumors is characteirzed by the presence of primitive cells with elements of neuronal and/or glial differentiation. [from HPO]