A<unk>  is a condition in which an untreated<unk>  has burned through the mucosal wall in a segment of the gastrointestinal tract (e.g., the stomach or colon) allowing gastric contents to leak into the abdominal cavity.
Perforated ulcer
Tropical ulcer
Callous ulcer
Evisceration 
Kangri ulcer
Cushing ulcer
Gastric erosion
Curling's ulcer