We observed a 15-year-old Caucasian boy with a rare form of reflex epilepsy, known as hot water epilepsy (HWE), associated to McCune-Albright syndrome (MAS). This is a rare disease due to post-zygotic and somatic mutations of the Gs-alpha gene, that results in cellular mosaicism. Predominant features of MAS occur in the bony skeleton, the skin, the endocrine system, and, in atypical presentations, in other non-endocrine tissues. It is unknown whether or not an expression of the GNAS1 product in the brain does exist. Although the association of MAS with HWE in our patient may be merely casual, it brings up the possibility that the striking phenotypic variability of MAS might also include epilepsy.