seromyotomy

Incision in the wall of a hollow viscus that involves the serosa and muscularis but not the mucosa. [serosa (1) + G. mys, muscle, + tome, a cutting]

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se·ro·my·ot·o·my (se″ro-mi-otґə-me) [sero- + myo- + -tomy] a cutting into the serosal and muscular layers of the wall of an organ.