[Verse 1] In the truncus arteriosus type two design Where the trunk forgot to separate in time The spiral twist creates a puzzling maze Left PA climbs up while right PA stays low [Chorus] LPA anterior superior rise RPA posterior inferior lies Embryonic rotation leaves its trace Document the spiral every case When the trunk divides but keeps the twist Surgical planning can't afford to miss [Verse 2] The undivided truncal root spun round Before the septum came to split the sound Now catheter threading hits a wall The geometry defies the normal call [Chorus] LPA anterior superior rise RPA posterior inferior lies Embryonic rotation leaves its trace Document the spiral every case When the trunk divides but keeps the twist Surgical planning can't afford to miss [Bridge] Anastomosis angles shift and bend The spiral course will challenge surgeon's hand Echo, CT, cardiac cath must show Which vessel climbs and which one stays below [Verse 3] Each imaging study bears the weight To map this twisted pulmonary fate The spiral signature demands respect Or intervention plans will misdirect [Chorus] LPA anterior superior rise RPA posterior inferior lies Embryonic rotation leaves its trace Document the spiral every case When the trunk divides but keeps the twist Surgical planning can't afford to miss [Outro] In type two truncus remember well The spiral course has tales to tell
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