A<unk>  is a type of cancer, more common in children, that is caused by malignancies in precursor cells, often called blasts. Examples are nephroblastoma, medulloblastoma, and retinoblastoma. The suffix<unk>  is used to imply a tumor of primitive, incompletely differentiated (or precursor) cells, e.g., chondroblastoma is composed of cells resembling the precursor of chondrocytes.
Blastoma
Embryoma
Polyembryoma
Poroma
Teratoma
Embryonal carcinoma
Seminoma
Stoma 