Monarch Disease Ontology term MONDO_0006123 (cardiac rhabdomyoma) is a well circumscribed benign tumor arising from cardiac muscle. It usually affects children and may be present in the fetus. Depending on tumor location and size, cardiac, respiratory, and hemodynamic parameters may be affected. There is an association between cardiac rhabdomyoma and tuberous sclerosis. Also known as: cardiac rhabdomyoma (disease), heart rhabdomyoma, rhabdomyoma of heart, rhabdomyoma of the heart.