• (n.) The act or practice of opening cysts; esp., the operation of cutting into the bladder, as for the extraction of a calculus.
<procedure, surgery> A surgical incision into the bladder. ... (27 Sep 1997) ... 
(sis-tot´ә-me) vesicotomy.
Cys·tot'o·my noun [ Greek ............ bladder + ............ to cut: confer French cystotomie .] The act or practice of opening cysts; esp., the operation of cutting into the bladder, as for the extraction of a calculus. 
Type: Term Pronunciation: sis-tot′ō-mē Definitions: 1. Incision or puncture into urinary bladder or gallbladder. Synonyms: vesicotomy
A cystotomy is an incision into the bladder.