<prompt> 25 year old male presented with growth in left atrium. Diagnosis?RhabdomyomaMyxomaMetastasisPapillary elastosis  <response>: Ans. b MyxomaThe left atrium has been opened to reveal the most common primary cardiac neoplasm-an atrial myxoma. These benign masses are most often attached to the atrial wall. They can produce a ball valve effect by intermittently occluding the atrioventricular valve orifice. 