Acute coronary syndrome in a patient with a single coronary artery arising from the right sinus of Valsalva

Table 1 Angiographic classification of a single coronary artery proposed by Lipton in 1979[3]

Ostial location	R	Right sinus of Valsalva
	L	Left sinus of Valsalva
Anatomical distribution	I	Single coronary artery with normal right or left coursing (RC or LC)
	II	After leaving the right or left sinus the single coronary artery crosses at the base of the heart as a large transverse trunk in order to supply the contralateral coronary artery
	III	Single coronary artery arising from the right sinus, with the left anterior descending and circumflex arteries from separate coronary artery trunks instead of a single trunk immediately at the exit
Course of the transfer branch	A	Anterior to the large vessels (anterior to the right ventricle)
	B	Between the aorta and pulmonary artery
	P	Posterior to the large vessels
	S	Septal type (above the interventricular septum)
	C	Combined type