A 30 year old male, labourer, chronic smoker, alcoholic, presents with acute chest pain, severe back pain, radiation to interscapular area. The diagnosis is

(B) Ruptured aortic aneurysm> Dilatations of localised segments of the arterial system are called aneurysms.> They can either be true aneurysms, containing the three layers of the arterial wall in the aneurysm sac, or false aneurysms, having a single layer of fibrous tissue as the wall of the sac, e.g. aneurysm following trauma and as a mycotic aneurysm. ('Mycotic' is a misnomer, as the cause is not due to a fungus but to bacterial infection).