Urethral and periurethral lithiasis / by Victor Cox Pedersen.

  • Pedersen, Victor Cox, 1867-1958.
Date:
[1913]
Catalogue details

Licence: In copyright

Credit: Urethral and periurethral lithiasis / by Victor Cox Pedersen. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    other elements artificially introduced in the course of disease, surgical intervention, and unnatural practices. Such foreign matter becomes the nucleus of the calculus through the excitation of the two factors in the pathogenesis of stone just alluded to, with secondary precipitation of urinary salts upon this nucleus. From the foregoing general bases it follows that urethral and periurethral calculi are either migra- tory, with various degrees of impaction, or forma- tive, otherwise called native—urethral stones, in the strict sense. Migratory concretions originate in renal, ureteral, and vesical pathogenesis through all the factors just laid down in the opening sen- tences of this paper to which is added migration of the stone from its seat of origin toward the outer world until arrested in the urethra at one of the natural narrowings in health, or at one of the path- ologically altered points in disease. The term encysted calculi is employed for stones in pockets and diverticula communicating with the urethra in either the anterior or posterior portion. Congenital diverticula of the anterior urethra usu- ally occur between the glans and the scrotum, while acquired forms result from injury, such as rupture, cysts, scars, strictures, fistulae, and the like. Pro- static urethral diverticula are also either congeni- tal or acquired. Remains of the urogenital sinus constitute the congenital forms, while the acquired types are due to cysts, abscesses, etc., or, finally, to the secondary pathology of the stones themselves, leading to ulceration through the urethra and then to encystment. Some authorities maintain that these encysted stones have unusual and peculiar composi- tion. Englisch,1 in 100 specimens, found thirty- five percent of complex composition, twenty-seven per cent, phosphates, twenty-two per cent, urates, and sixteen per cent, oxalates. 1Archiv fiir klinische Cliirurgie, lxxii, p. 487.