Long-term evolution of a laughing headache associated with chiari type 1 malformation

We describe an acute-onset, sharp, short-lasting (few seconds) headache at the vertex, that first occurred 10 years ago in a 44-year-old woman, Attack s were triggered by vigorous laughing. A magnetic resonance imaging study s howed a Chiari type 1 malformation. To our knowledge, laugh-induced headache with long-term evolution in associ ation with Chiari type 1 malformation has not been previously reported.