[Verse 1] Back in nineteen forty-nine, Collett and Edwards drew the line Four types of truncus, where do arteries align? Type One's got a short main trunk, sixty percent of cases spunk Left side sprouting, then it splits, that's how the normal pattern fits [Chorus] Where do pulmonary arteries come from? Classification tells us how they run Type One short main, Type Two separate doors Type Three wide apart, Type Four needs more Collett Edwards, Van Praagh too Teaching us what doctors need to know [Verse 2] Type Two's our patient here tonight, twenty to thirty percent right No main segment to be found, separate ostia all around Left posterior surface shows, where each artery grows and flows Adjacent doors but standing lone, each PA has its own home [Chorus] Where do pulmonary arteries come from? Classification tells us how they run Type One short main, Type Two separate doors Type Three wide apart, Type Four needs more Collett Edwards, Van Praagh too Teaching us what doctors need to know [Bridge] Type Three widely separated walls, ten percent of all the calls Type Four was reclassified, pulmonary atresia's side Van Praagh came in sixty-five, kept the knowledge alive A-one through A-four he made, different system, different grade [Verse 3] Our case shows the spiral course, left PA takes anterior force Superior positioning clear, right PA posterior here Inferior pathway it will take, no main segment for heaven's sake Type Two classic presentation, spiral course demonstration [Chorus] Where do pulmonary arteries come from? Classification tells us how they run Type One short main, Type Two separate doors Type Three wide apart, Type Four needs more Collett Edwards, Van Praagh too Teaching us what doctors need to know [Outro] Two systems help us understand Where pulmonary vessels stand Classification is the key To truncus anatomy
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