A nodular, tumor-like mass attached to the wall of the right atrium and bulging into the lumen was found in three calves. It consisted of cardiac muscle, connective tissue, and communicating blood-filled spaces. There were small thick-walled spaces that communicated with coronary arteries and wide thin-walled spaces that communicated with the atrial lumina. In one calf an anastomosis between both types of spaces was found.
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