title: Picture quiz: a case of sudden severe chest pain: answers.
abstract: Pneumomediastinum is a condition in which air presents in the mediastinum. It was first described by Laennec in 1819 as a consequence of trauma. Spontaneous pneumomediastinum (SPM) was reported in 1939 by Hamman.
authors: M Abu
authors: MA
authors: Rabia
authors: P
authors: P
authors: Sullivan
authors: S M
authors: SM
authors: Stivaros