Neuroblastoma Neuroblastoma is a cancerous tumor that begins in nerve tissue of infants and very young children. The abnormal cells often are found in the nerve tissue that is present in the unborn baby and later develops into a detectable tumor. More Information More Home Doctors Services Home Doctors Services No clinicians found Please try a new search Start a New Search Need help finding the right clinician? We're here to help! Contact Us Online or at 888-402-LVHN (5846) Hours: Monday-Friday, 7 a.m.-8 p.m. Saturday-Sunday, 9 a.m.-5 p.m.