RT Journal Article SR Electronic T1 Chest wall mass: what lies beneath? JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 586 OP 586 DO 10.1136/emermed-2018-207503 VO 35 IS 10 A1 Richards, Claire Elaine A1 Mostafa, Ahmed Mamdouh Taha A1 Elmoheen, Amr YR 2018 UL http://emj.bmj.com/content/35/10/586.abstract AB Clinical introduction A 24-year-old Filipino man attended the ED with a 1-month history of a discrete swelling over his upper anterior chest wall that was rapidly increasing in size and tenderness. He denied any other symptoms. His medical history was unremarkable.Examination revealed a tender, 7 cm × 6 cm mass over the upper part of the sternum (figure 1). The surface was smooth, it was immobile, non-compressible and the overlying skin was normothermic but mildly erythematous. Cervical lymphadenopathy was present. His vital signs were normal.Figure 1 Chest wall mass.Question What is the most likely diagnosis?LipomaChondrosarcomaLymphoma Mycobacterium tuberculosis (TB)Question