The incidence of fetal tumors is not high, in the 1/12000 ~ 1/30000. Far less than the birth rate of newborns. Fetal, neonatal tumors are divided into two categories, leukemia and solid tumors, which are different from adults. As the level of medical technology to improve the early detection of fetal tumors are not uncommon, the more common types of intracranial tumors (brain tumors), kidney tumors, hemangiomas, lung tumors.
These tumors, most of which are stromal cell tumors, are not epithelial tumors. 2. Many childhood malignant tumors if it occurs in the fetal period, then its biologic behavior more biased benign, the prognosis of treatment will be better, such as neuroblastoma, congenital fibrosarcoma, retinoblastoma and so on. 3. These tumors are mainly derived from fetal non-mature cells or fetal stem cell oncogene mutations, it is also known as blastoma or embryonal sarcoma.
Fetal tumors, usually by ultrasound and other means, in the prenatal diagnosis was checked out. Pregnant women in pregnancy for more than five months and more than eight months when the row of the examination, can show the various parts of the fetus organs to understand the fetal growth and development, observation of the head, limbs and organs of the general structure is abnormal.
The diagnosis of fetal tumors mainly rely on imaging studies, such as ultrasound or magnetic resonance, but the relatively small volume of solid tumors or leukemia often have to wait until infancy or childhood to diagnose. Fetal tumors can cause fetal edema, excessive amniotic fluid and other symptoms, so once the emergence of fetal edema or excessive amniotic fluid, need to pay attention and a detailed examination to rule out fetal tumors.
Some fetal tumors are not tumors in nature, such as fetal hemangioma is vascular malformations, fetal lung cysts are cystic adenomatous malformations. The incidence of various fetal tumors is not the same.