[Verse 1]
Single vessel arising from the cardiac base
Two semilunar valves in truncal embrace
Moss and Adams chronicle this twisted tale
Where aorta and pulmonary should never fail
To separate cleanly in the growing heart
But embryology tears the plan apart
[Chorus]
Truncus Type Two, remember the clue
Pulmonary branches spring from the back view
Posterior wall, that's where they call
Home for the arteries meant to crawl
To lungs awaiting oxygenated dreams
While systemic circulation schemes
[Verse 2]
Anderson maps the conotruncal zone
Where neural crest cells should have grown
Into spiraling septum, neat and clean
Instead we find this morphologic scene
Of common outlet valve commanding flow
To circuits high and circuits low
[Chorus]
Truncus Type Two, remember the clue
Pulmonary branches spring from the back view
Posterior wall, that's where they call
Home for the arteries meant to crawl
To lungs awaiting oxygenated dreams
While systemic circulation schemes
[Bridge]
Kirklin guides the surgeon's blade
Through conduit repair parade
Right ventricle to pulmonary connection
Restoring proper flow direction
Valved tube bridging the divide
Where nature's blueprint went awry
[Verse 3]
Cyanosis paints the infant blue
Volume overload breaks through
Congestive failure stakes its claim
Unless repair extinguishes the flame
Of mixing blood in single trunk
Where separated streams have sunk
[Final Chorus]
Truncus Type Two, we know what's true
Posterior birth of vessels blue
Surgical fix with conduit trick
Makes two from one with expert pick
Knowledge gleaned from textbook lore
Saves the hearts worth fighting for