Aneurysms are focal abnormal dilatation of a blood vessel. They typically occur in arteries, venous aneurysms are rare. Aneurysms may also occur in the heart.
- hereditary connective tissue disorders
- fibromuscular dysplasia
- infection: mycotic aneurysm, syphilis (luetic aneurysm)
- myocardial infarction: may cause left a ventricular aneurysm
- flow related (in cerebral AVM, contralateral ICA occlusion etc)
Morphologically there are two main types of aneurysms. The morphology is not specific for any cause:
- saccular aneurysm: eccentric, involving only a portion of the circumference of the vessel wall
- fusiform aneurysm: concentric, involving full circumference of the vessel wall
Occasionally a 3rd type, serpentine aneurysm has been classified as a separate entity 3.
- distal thromboembolism
- pressure effects
- 1. Kaufman JA, Lee MJ. Vascular and interventional radiology, the requisites. Mosby Inc. (2004) ISBN:0815143699. Read it at Google Books - Find it at Amazon
- 2. Kumar V, Abbas AK, Fausto N et-al. Robbins and Cotran pathologic basis of disease. W B Saunders Co. (2005) ISBN:0721601871. Read it at Google Books - Find it at Amazon
- 3. Sari A, Kandemir S, Kuzeyli K et-al. Giant serpentine aneurysm with acute spontaneous complete thrombosis. AJNR Am J Neuroradiol. 2006;27 (4): 766-8. AJNR Am J Neuroradiol (full text) - Pubmed citation