Rupture in smooth muscle tissue (6)
I believe the answer is:
hernia
(Other definitions for hernia that I've seen before include "Protrusion of organ throung abdinen, rupture" , "Rupture, protrusion of organ through abdominal wall" , "Breaking of an organ through its lining" , "An heir (anag.)" , "Protrusion of organ through wall of abdomen, a rupture" .)