has part has part has_part characteristic of part of has modifier abnormal heart right atrium morphology abnormal vena cava sinus morphology abnormal sinus of the vena cava MP:0010497 MPheno.ontology csmith 2010-09-30T01:19:16Z any structural anomaly of the portion of the cavity of the right atrium of the heart that receives the blood from the vena cavae and is separated from the rest of the atrium by the crista terminalis morphology abnormal vena cava sinus