<unk><unk> s are characterized by a single abnormally large blood vessel (arteriole) beneath the gastrointestinal mucosa (submucosa) that bleeds, in the absence of any ulcer, erosion, or other abnormality in the mucosa. The size of these blood vessels varies from 1–5 mm (more than 10 times the normal diameter of mucosal capillaries). Pulsation from the enlarged vessels leads to focal pressure that causes thinning of the mucosa at that location, leading to exposure of the vessel and subsequent hemorrhage. Approximately 75% of<unk> s occur in the upper part of the stomach within 6 cm of the gastroesophageal junction, most commonly in the lesser curvature. However,<unk> s may occur in any part of the gastrointestinal tract. Extragastric<unk> s have historically been thought to be uncommon but have been identified more frequently in recent years, likely due to increased awareness of the condition. The duodenum is the most common location (14%) followed by the colon (5%), surgical anastamoses (5%), the jejunum (1%) and the esophagus (1%).<unk> s have been reported in the gallbladder. The pathology in these extragastric locations is essentially the same as that of the more common gastric<unk> .
Dieulafoy's lesion
Martorell's ulcer
Marjolin's ulcer
Curling's ulcer
Hunner's ulcer
Tornwaldt's disease
Lipschütz ulcer
Dercum's disease