1) Dilatation 2) Distension 3) Distention 4) Ectasis 1) Ectasis 2) Lymphangiectasia 3) Lymphangiectasis 
Ectasia (meaning `dilation` or `distention of a tubular structure`) occurs as part of a pathophysiological process. ==Specific conditions== ...
• (n.) A dilatation of a hollow organ or of a canal.
(ek-ta´zhә) expansion, dilatation, or distention. adj., ectat´ic., adj. mammary duct ectasia a benign condition occurring in postmenopausal women, characterized by dilation of the ducts, inspissation of breast secretions, and periductal inflammation. Called also co...
Ec·ta'si·a noun [ New Latin See Ectasis .] (Medicine) A dilatation of a hollow organ or of a canal. 
Type: Term Pronunciation: ek-tā′zē-ă, ek′tă-sis Definitions: 1. Dilation of a tubular structure.
[n] - dilatation or distension of a hollow organ
ectasis noun dilatation or distension of a hollow organ