18FDG = 18fluorodeoxyglucose; A = axillary lymphadenopathy; AF = atrial fibrillation; AFL = atrial flutter; AVNRT = atrioventricular nodal reentrant tachycardia; AFB = acid fast bacilli; ATT = anti-tuberculosis therapy; C = cervical lymphadenopathy; CS = cardiac sarcoidosis; IAS = interatrial septum; LA = left atrium; LAA = left atrial appendage; LAPW = posterior wall of left atrium; LVEF = left ventricular ejection fraction; M = mediastinal lymphadenopathy; M.tb PCR = polymerase chain reaction to detect Mycobaterium tuberculosis; Mtx =methotrexate; N = negative; NA = not available; P = positive; PDN = prednisolone; RA =right atrium; RAA = Right atrial appendage; S= supraclavicular lymphadenopathy; TB = tuberculosis.