[Verse 1]
Listen close, the trunk divides its story here,
Not one gate but two, set close or far, a whispered frontier,
Posterior wall, sometimes drifting left and low,
Separate ostia, that's the clue you need to know,
The distance between them shifts from case to case,
Measure the gap before you map the space.
[Chorus]
Two ostia, one common root,
Posterior wall is where they shoot,
Spiral apart, or crossing tight,
Type Two's secret hides in plain sight,
Left goes high, right dips below,
Remember the twist before you go,
Two ostia, one trunk, one truth,
That's the fingerprint of Type Two.
[Verse 2]
Now follow the branches as they wind and lean,
A spiral course, a crossing scene,
Left artery climbing anterior and up so proud,
Right one sinking posterior, low beneath the cloud,
Or reverse the pattern, the map can turn about,
Surgeons trace this twist before they cut it out,
Because the conduit's landing spot depends upon the bend,
Get the geometry wrong, and the graft won't mend.
[Verse 3]
Below the valve a window opens wide,
Subarterial VSD, ten to fifteen millimeters side to side,
A fibrous rim sits proudly at the top,
While down below the conduction fibers never stop,
The bundle of His runs quiet, tucked and near,
Respect that rim, or the rhythm you'll impair.
[Chorus]
Two ostia, one common root,
Posterior wall is where they shoot,
Spiral apart, or crossing tight,
Type Two's secret hides in plain sight,
Left goes high, right dips below,
Remember the twist before you go,
Two ostia, one trunk, one truth,
That's the fingerprint of Type Two.
[Verse 4]
One valve to rule the outflow, thick and strange,
Three leaflets mostly, sixty-five to seventy in range,
Four cusps appear in one case out of five,
Two cusps show up rarer, still it thrives,
Dysplastic, floppy, thickened tissue at its core,
This valve wears damage that the trunk cannot ignore.
[Bridge]
Right aortic arch bends the mirror plane,
Left brachiocephalic leads the mirror-image train,
Thirty percent, this quirk loves Type Two best,
A foramen ovale left open, uninvited guest,
Coronaries wander, single ostium, crossing paths unseen,
Right through the ventriculotomy, sneaking in between,
Twenty-two Q eleven, the missing thread,
Thirty to forty percent carry it instead,
Widely separated origins — that's Type Three, not this,
And absent branch entirely — call that A3, don't miss,
Type Two stands between them, close but still apart,
Separate doors, one lintel, that's the anatomic art.
[Chorus]
Two ostia, one common root,
Posterior wall is where they shoot,
Spiral apart, or crossing tight,
Type Two's secret hides in plain sight,
Left goes high, right dips below,
Remember the twist before you go,
Two ostia, one trunk, one truth,
That's the fingerprint of Type Two.
[Outro]
Posterior doors, a spiral thread,
The rim, the valve, the arch instead,
Type Two whispers what the heart concealed,
Now the anatomy stands revealed.