Isolated Cardiac Sarcoidosis in a Patient with a Rare Coronary Anomaly Presenting with MINOCA and Heart Block: The Devil Is in the Detail

A middle-aged pre-menopausal female presented with shortness of breath and syncope. She had a past history of acute onset chest pain with elevated cardiac enzyme, regional wall motion abnormality on echocardiography, and a coronary anomaly in angiogram. She was being treated as a case of coronary artery disease. On current evaluation, she had right bundle branch block with intermittent 2: 1 AV block on ECG and a hyperechoic and hypo-kinetic interventricular septum with moderate left ventricular systolic dysfunction on echo-cardiography. Coronary angiogram revealed hyperdominant left anterior descending with right coronary artery ostial atresia. The patient was diagnosed to have cardiac sarcoidosis on the basis of epicardial late gadolinium enhancement (LGE) on MRI and increased use of 68-Gallium DOTANOC PET scan. Patient underwent dual-chamber ICD implantation and then steroids were started.