The dilatation of a passage.
The dilatation of a tube, duct, or hollow organ.
A term that means widening, usually referring to a disorder of a duct bearing secretions from a gland or organ (e.g. mammary duct ectasia).
The term “ectasia” is used to describe a condition of widening, particularly concerning a disorder of a duct. For instance, mammary duct ectasia refers to the abnormal widening of the ducts responsible for carrying secretions from breast tissue to the nipple.