text: Yo, check it out, here's the story that I gotta tell,
  'Bout an 8-year-old boy, ain't been feelin' well.
  He got that Diamond-Blackfan anemia, it's a struggle,
  Ended up in the hospital, things startin' to bubble.
  
  Frequent vomiting for three days straight,
  Loin pain hittin' hard, man, it just ain't great.
  This ain't the first time, he been here before,
  Same complaints, but they ain't findin' the core.
  
  Ultrasound on the abdomen, what did they see?
  Left renal pelvis dilated, somethin' ain't right, you see.
  Talkin' 'bout a renal scintigraphy, the doc had a plan,
  But the mother said, "No furosemide, my son can't stand."
  
  Allergic to that stuff, that's what she claimed,
  Every time he took it, his stomach went insane.
  But it might just be the diuretic effect at play,
  Causing renal pelvis dilation, makin' him sway.
  
  Scintigraphy without furosemide, what did it show?
  Obstruction in the kidneys, function all asymmetrical.
  So they did a pyeloplasty, to make things right,
  After that, he's been symptom-free, sleepin' tight.
  
  For those with cyclic vomiting, here's what you gotta do,
  Consider uretero-pelvic junction obstruction, it's true.
  Only way to rule it out, when the complaints arise,
  Ultrasound and scintigraphy, under proper hydration, no lies.
  
  So remember this tale, it's a lesson to learn,
  When it comes to medical mysteries, you gotta discern.
  Sometimes the answers ain't so clear, but we persist,
  Keep searchin' for the truth, that's the rap, insist!