TY - JOUR T1 - A diagnostic red herring JF - Emergency Medicine Journal JO - Emerg Med J SP - 184 LP - 184 DO - 10.1136/emermed-2017-206783 VL - 35 IS - 3 AU - Alexander J Martin-Bates AU - Charles Martin-Bates AU - Richard Withnall Y1 - 2018/03/01 UR - http://emj.bmj.com/content/35/3/184.abstract N2 - Clinical introduction A 29-year-old keen parachutist presented to the emergency services in Cyprus complaining of sudden-onset facial flushing, dizziness and a widespread rash. The episode began on a hot day, 1 hour after she had eaten a breakfast of tinned tuna, and while she was ascending in an aircraft to parachute from 10 000 ft. She completed her jump uneventfully. She had no significant medical history (figure 1).Figure 1 Patient’s legs on presentation; this rash was generalised.Question Based on the history and rash, which ONE of the following is the most likely diagnosis?Fish allergyHeat-related eruptionScombrotoxin poisoningStress-induced urticariaQuestion ER -