Five cases (three of them from a same family) of multicore myopathy ar
e presented, The age at diagnosis ranged from 4 to 38 years, In 2 case
s muscle complaints develope early in chidhood while in the remaining
3 cases raised CK serum levels lead to perform a muscle biopsy. Malign
ant hyperthermia occurred in a young boy among the three affected rela
tives. Other family members are probably affected, suggesting an autos
omal dominant inheritance. In none of the patients progressive disabli
ng myopathy has occurred after a long term follow-up. A review of the
bibliography is included, and clinical and evolutive characteristics o
f this myopathy are commented.