pyelostomy
noun
py·e·los·to·my
ˌpī-(ə-)ˈläs-tə-mē 
plural pyelostomies
: the operation of forming an artificial opening in the renal pelvis of a kidney in order to provide a drainage route for urine alternative to the ureter
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“Pyelostomy.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pyelostomy. Accessed 4 Nov. 2024.
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