[An unusual coincidence: elective mutism and sleep-related bioelectric seizure status syndrome].

A case study of a 9-year-old girl is presented which suffers from elective mutism and a rare, special form of cerebral seizures (ESES). After a brief review of the literature concerning these two rare diseases diagnosis, psychotherapy and anticonvulsive treatment as well as a follow-up are described. It is argued that in this case there are two independent, very rare diseases, and problems are discussed which arise from the necessity to integrate two heterogeneous therapeutic concepts.