Ectasia (), also called ectasis (), 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).
Bronchiectasis, chronic dilatation of the bronchi
Duct ectasia of breast, a dilated milk duct. Duct ectasia syndrome is a synonym for nonpuerperal (unrelated to pregnancy and breastfeeding) mastitis.
Dural ectasia, dilation of the dural sac surrounding the spinal cord, usually in the very low ...
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