Abstract The role of conventional 2D echocardiography in the setting of acute myocarditis is limited as often it reveals no significant changes in global systolic function. Published studies have demonstrated the usefulness of myocardial deformation imaging in acute myocarditis with global longitudinal strain (GLS) being more sensitive in the recognition of myocardial dysfunction even in preserved systolic function and its strong correlation to the amount of myocardial oedema found on cardiac MRI. It also has the advantage of being more readily available, requiring a shorter interpretation time and is significantly cheaper as compared to cardiac MRI. GLS has also been shown to play a role in risk stratification with a lower GLS being associated with a higher rate of major adverse cardiac events (MACE) among all myocarditis cases independent of LV ejection fraction. We describe a case where there was strong correlation between GLS and myocardial oedema on CMR T1 weighted imaging. A 26 year old with no relevant past medical history presented to hospital complaining of pleuritic sounding chest pain. ECG showed ST segment changes suggestive of pericarditis. White blood cell count and troponin levels were elevated. Echocardiography performed on the same day showed apical akinesia and reduced longitudinal LV function. Global longitudinal strain was an average of -8% and was notably reduced in the apical, inferior, posterior and lateral regions. The overall left ventricular function was normal (55% by bi-plane Simpson"s method). Cardiac MRI showed normal LV size and function with myocardial oedema in the mid inferolateral, apical inferior and apical anterior segments. These findings were consistent with acute myocarditis affecting the involved segments. Our case demonstrates that the global longitudinal strain reduction correlated very similarly to the pattern of myocardial oedema in the affected segments and is consistent with similar findings from published studies. GLS by 2D speckled imaging may therefore play an important role in the assessment of acute myocarditis especially in patients with preserved ejection fraction and may help in risk stratification. Abstract P1318 Figure. combined GLS CMR