[Verse 1] When the truncal root refuses to divide The pulmonary branches take a twisted ride Left PA climbs up high, anterior and bright Right PA drops below, posterior from sight [Chorus] It's a spiral dance, a twisted romance LPA up front, RPA behind From embryonic days when rotation went astray This pattern you must always find Left anterior superior, right posterior inferior Document it every time [Verse 2] The undivided trunk just spins around Creating geometry that's quite profound What should be side by side now overlap Making surgery a complex map [Chorus] It's a spiral dance, a twisted romance LPA up front, RPA behind From embryonic days when rotation went astray This pattern you must always find Left anterior superior, right posterior inferior Document it every time [Bridge] Every echo, every cath, every CT scan you read Mark the spiral course or surgical plans won't succeed Anastomosis angles change when vessels cross this way The catheter won't navigate if you don't know the play [Verse 3] Type Two truncus brings this gift so strange Pulmonary arteries in spiral range The interventional team needs to know Which way these twisted vessels go [Final Chorus] It's a spiral dance, a twisted romance LPA up front, RPA behind From embryonic days when rotation went astray This pattern you must always find Left anterior superior, right posterior inferior Document it every time [Outro] In truncus type two, remember what's true The spiral course defines the view
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