<unk>  is an enlargement (i.e megaly) of the heart (Cardio means heart in Greek).
It’s not a disease in itself but a physical sign that occur in many diseases and condition.
Cardiomegaly
Hepatomegaly
Clitoromegaly
Abdominal enlargement
Bulging flanks
Breast engorgement
Subcutaneous emphysema
Dactyly