Minute Hemorrhages may occur in chronic passive congestion and in hemorrhagic diatheses. Severe hemorrhage may follow ulcerations of all kinds, particularly from the typhoidal, or wounds, such as the bites of intestinal parasites.

Edema is present in chronic passive congestion, and in inflammations, particularly if severe.

Embolism and thrombosis may occur. As a rule, there are no bad results, as the anastomoses are so extensive that necrosis does not occur. It may, however, if the mesenteric vessels be involved, be followed by hemorrhagic infarction with fatal necrosis of the portion of the intestine involved and peritonitis. The formation of the duodenal ulcer in burns is thought by some to be due to thrombosis.

Amyloid degeneration beginning in the fibrous wall of the small blood-vessels of the mucosa and submucosa is quite frequently encountered in chronic tuberculosis, syphilis, and chronic suppuration.