“AT/RTs occur in both children and adults and are very rare in both age groups. Most patients are younger than two years of age at diagnosis. An estimated 470 people are living with this tumor in the United States and only 50 are adults. AT/RTs occur slightly more often in males than females.”

NIH National Cancer Institute (Atypical Teratoid/Rhabdoid Tumors (AT/RT): Diagnosis and Treatment – NCI)