Author: Adrian Boyle / Editor: Adrian Boyle / Reviewer: Michael Perry / Codes: EnvC4, ResP2, SLO1 / Published: 13/07/2023

An 18-year-old male attends your Emergency Department (ED) with left sided pleuritic chest pain.

He returned from his second day of a beginner’s SCUBA diving course held in a lake in the UK four hours ago. He developed discomfort following a “practice emergency ascent”.

He describes mild breathlessness that has developed over the last four hours, but no cough or haemoptysis. He was previously well.