[Verse 1]
CT with contrast, oral and IV, step through the anatomy
Obstruction shows the transition point, dilated loops for all to see
Perforation — free air beneath the diaphragm, pneumoperitoneum
Ischemia, portal venous gas, staging tumours at the ileum
Crohn's disease calls for enterography, CT or MR grade
Mural thickening, skip lesions mapped, the comb sign on display
Wall enhancement, strictures, fistulas, abscess hiding deep
MR enterography reads the bowel wall while the patient breathes
[Chorus]
CT, MRI, PET-CT, contrast enema too
Tag the red cells, scan the Meckel's, mesenteric CTA
Pelvic MRI for rectal cancer — T stage, fascia, EMVI
Every modality has its place, know when and what and why
CT, MRI, PET-CT, contrast enema too
The pelvis, gut, and mesentery — scan it all the way through
[Verse 2]
Pelvic MRI, the rectum's courtroom, every detail tried
Mesorectal fascia margin threatened — circumferential decide
T staging layer by layer, muscularis the border zone
EMVI when the vessels fill with tumour, nodes that calcify alone
Tumour deposits scattered like lacunae in the fat
Low rectal cancer — intersphincteric plane or levator, note that
MERCURY criteria guiding surgeons, CRM predicted clear
MRI answers questions that no CT can engineer
[Chorus]
CT, MRI, PET-CT, contrast enema too
Tag the red cells, scan the Meckel's, mesenteric CTA
Pelvic MRI for rectal cancer — T stage, fascia, EMVI
Every modality has its place, know when and what and why
CT, MRI, PET-CT, contrast enema too
The pelvis, gut, and mesentery — scan it all the way through
[Verse 3]
PET-CT lights up metabolic activity, glucose hungry cells
Recurrent colorectal cancer, restaging after chemo spells
Limitations — mucinous tumours, signet ring won't glow
Low FDG avidity means false negatives, surgeon needs to know
Contrast studies — upper GI series, swallowing under screen
Small bowel follow-through traces transit through the jejunine
Gastrografin challenge in SBO — therapeutic and diagnostic claim
Defecography captures pelvic floor mechanics, puborectalis to blame
[Bridge]
Now ultrasound — compressible appendix means it's clear
Non-compressible, target sign, periappendiceal fluid — appendicitis here
Endoanal ultrasound reads the sphincter like a manuscript
Internal, external layers, fistula tracks, the anatomy gripped
Tagged RBC scan — bleeding source when CT angiography fails
Half-life of technetium maps the haemorrhage trails
Meckel's scan seeks ectopic gastric mucosa, pertechnetate absorbed
A vestigial ileal outpouching — embryologic, unexplored
[Chorus]
CT, MRI, PET-CT, contrast enema too
Tag the red cells, scan the Meckel's, mesenteric CTA
Pelvic MRI for rectal cancer — T stage, fascia, EMVI
Every modality has its place, know when and what and why
CT, MRI, PET-CT, contrast enema too
The pelvis, gut, and mesentery — scan it all the way through