“…It is evident that the right atrium is the largest cardiac chamber in all 3 cases; it forms the right and posterior heart borders and at least in Case 3 is larger than the other cardiac chambers together. The tricuspid valve appears to be situated in normal position and there is no evidence of displacement of the valve or atrialization of the right ventricle using the criteria described by HIPONA & ARTHACHINTA (1965) or SOLOFF et coli. (1957).…”