atresias

Example:The obstruction of the ductus arteriosus is a rare condition that can lead to pulmonary hypertension in newborns.

Definition:A block or closure of a passage, channel, or natural cutting, such as a vascular or an organ duct.

Example:The narrowing of the urethra, or stenosis, can lead to urinary retention and contribute to urological issues.

Definition:A narrowing or constriction of a body passage or orifice, often due to inflammation or scarring.

Example:The occlusion of the renal artery can lead to reduced blood flow to the kidneys, potentially resulting in renal failure.

Definition:The blocking or closing of a blood vessel or other bodily passage, often caused by a clot or other material.