Table 1.

Classification of PAA.

	Acquired
Congenital	True aneurysms	Pseudoaneurysms
Increased pulmonary blood flow (Eisenmenger’s syndrome)	Pulmonary arterial hypertension related	Post infectious
Pulmonary valvular abnormalities	Lung conditions other than pulmonary hypertension	Malignancy related
Connective tissue abnormalities	Vasculitis	Iatrogenic
	Idiopathic	Traumatic