Atherosclerotic aneurysm:-usually occur in the abdominal aorta above renal arteries,

Aortic dissection:usually occur in severe atherosclerosis

Varicose veins:- •this condition caused by decrease in intraluminal pressure and loss of support of vessel wall

Phlebothrombosis is thrombus formation in deep veins of upper extremities

The most common benign tumor of blood vessel is hemangioma

hemangioma takes the form of large, flat, map-like discoloration
that cover large areas of face or upper parts of body producing port wine stain.

Capillary hemangioma:consists of uncapsulated
closely packed capillaries separated by a
Abundant connective tissue stroma

Angiosarcomait can be differentiated from other malignantsoft
tissue tumor as fibrosarcoma or
leiomyosarcoma

The most common cause of ischemic heart disease is a reduction in coronary arterial blood supply
due to I- atherosclerosis of coronary arteries.

Symptomatic ischemic heart disease is associated with reduction reached 65% or more of one or
more.

Most acute M.I are caused by preexisting atherosclerosis with thrombosis.

Myocardial necrosis begins within 20 to 40 minutes of time of coronary artery
occlusion.

The myocardial infarctstypically begin with subepicardial region,

subendocardial region,.it's the last area to receive blood from branches of the epicardial coronary
arteries.

The infarct usually reach the full size within 3 to 6 hours,

occlusion of left anterior descending coronary artery
cause infarction of anterior and basal areas of left ventricle.

occlusion of the right
coronary artery is responsible for most infarcts involving the posterior and basal
portions of left ventricle.

occlusion of more proximal
segments of the coronary arteries products larger infarcts involving the full
thickness of myocardium

occlusion of more distal arterial branches cause large zone of infarcts,

long standing coronary atherosclerosis, collateral circulation
may develop over time in response to chronic ischemia, this collateral increase the size
of infarct.

with M.I for the first 18 hours no changes
are evident on gross examination ,