[Chin tremor in a peruvian family]

Chin tremor is an uncommon hereditary autosomic dominant disorder, characterized by involuntary, episodic, and repetitive movements involving chin muscles, stimulated by stress. It was first described by Massaro in 1894 like geniospasmo . The most reported cases are from Europeans or Americans families.

A 53 years old man with chin tremor since childhood.

We report the first Peruvian family with chin tremor without European nor American ascendancy with six affected members in four generations.