Disease: Hat Head (Planopilicephaly)
Epidemiology: Sporadic cases throughout year; Seasonal peak in the months of May and June. No predilection for race or gender. Children are relatively protected from mass seasonal outbreaks.
Symptoms: Hair assumes flattened distorted shape after wearing popular head accessory. Pain is rare (aside from psychic/ego pain). Plagiocephaly (flattening of skull bones) usually does not occur unless a metal hat is worn (and put on with a sledgehammer). May be associated with Forehead Line and Bang Crush Injury.