Ectasia (/ɛkˈteɪʒə/), also called ectasis (/ˈɛktəsᵻs/), is dilation or distention of a tubular structure, either normal or pathophysiologic, but usually the latter (except in atelectasis, where absence of ectasis is the problem).
Specific conditions
References
Ectasia Wikipedia(Text) CC BY-SA