RT Journal Article SR Electronic T1 Laughing seizures due to a midline intraventricular neoplasm in tuberous sclerosis. JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 443 OP 444 DO 10.1136/adc.72.5.443 VO 72 IS 5 A1 S Gunatilake A1 D G De Silva YR 1995 UL http://adc.bmj.com/content/72/5/443.abstract AB Laughing seizures have been described in association with hypothalamic hamartomas and precocious puberty. Laughing seizures due to a neoplasm arising from the floor of the left lateral ventricle extending down towards the hypothalamus in a child with tuberous sclerosis is reported. This combination has not been reported before and emphasises the importance of imaging to diagnose such midline lesions in children with paroxysmal laughing.