RT Journal Article SR Electronic T1 Asymptomatic young man with an incidental murmur JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP heartjnl-2018-313223 DO 10.1136/heartjnl-2018-313223 A1 Maryam Shojaeifard A1 Hamid Reza Pouraliakbar A1 Golnaz Houshmand YR 2018 UL http://heart.bmj.com/content/early/2018/05/31/heartjnl-2018-313223.abstract AB Clinical introduction A 32-year old man was referred to our institution for transthoracic echocardiography (TTE) following detection of an incidental murmur on physical examination before blood donation. He was asymptomatic with no significant medical history. Physical examination revealed dual heart sounds with a grade II/VI systolic murmur heard in the left sternal border. An ECG was in normal sinus rhythm. TTE was performed (figure 1A–C, online supplementary videos 1–4) followed by cardiac CT angiography (CTA) (figure 1D,E).Figure 1 (A) Transthoracic echocardiography, parasternal left ventricular long axis view. (B) Colour Doppler of modified short axis in the mid-left ventricular level. (C) Doppler flow velocity profile. (D) Cardiac CT angiography (CTA) sagittal reconstruction. (E) Three-dimensional CTA reconstruction of the heart.Question What is the diagnosis?Pericardial cyst.Ventricular septal defect.Kawasaki.Anomalous left coronary artery from pulmonary artery (ALCAPA).