A stricture may be defined as an obstruction or closure, partial or absolute, of the lumen of any passage in the body. Thus, as familiar examples, the term "stricture" is applied to obstructions of the nose, throat, intestines and the urinary passages.
Among the commonest strictures are those of the male urethra, because trauma is not infrequent and infections of the urethral mucosa, especially gonorrhea, are common diseases. These always leave behind them, at one or more points of the mucous membrane, damage of sufficient degree and depth to cause the formation of scartissue, which, by the process of contracture or shriveling, leads to more or less closure of the canal. This narrowing progresses steadily for the worse as the years go by, in the vast majority of patients.
In a mill-stream the closure of a dam causes a backset or up-stream pressure of water along the main channel and
PEDERSEN VC. DILATATION OF STRICTURE OF THE MALE URETHRAWITH SPECIAL REFERENCE TO THE AUTHOR'S IRRIGATING TUNNELED AND GROOVED AND STANDARD SOUNDS. JAMA. 1910;LIV(1):29–35. doi:10.1001/jama.1910.92550270001001j
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