Pulmonary Arteriovenous Malformation Unmasked by Pregnancy: A Review of Pulmonary Arteriovenous Malformations and Cardiovascular and Respiratory Changes in Pregnancy

Table 1

Classification of pulmonary arteriovenous malformations [3, 14].

Group	Subgroup	Features
I		Multiple small arteriovenous fistulas
		Without aneurysm
II		Large arteriovenous aneurysm
III	A.	Large arteriovenous aneurysm (central)
	B.	Large arteriovenous aneurysm with anomalous venous drainage
	C.	Multiple small arteriovenous fistulas with anomalous venous drainage
IV	A.	Large venous aneurysm with systemic artery communication
	B.	Large venous aneurysm without fistula
V		Anomalous venous drainage with fistulas