RT Book, Section A1 Ng, Yu-tze A2 Duchowny, Michael A2 Cross, J. Helen A2 Arzimanoglou, Alexis SR Print(0) ID 1138411346 T1 Hypothalamic Hamartoma and Gelastic Epilepsy T2 Pediatric Epilepsy YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071496216 LK accesspediatrics.mhmedical.com/content.aspx?aid=1138411346 RD 2024/10/15 AB Hypothalamic hamartomas (HHs) are congenital mass lesions in the region of the third ventricle and tuber cinereum. Their true prevalence is unknown and is approximated to be 1 in 100,000. This estimated prevalence appears high but may actually be an underestimate as the diagnosis is often missed or at least significantly delayed.1