text: Yo, check it out, listen up, I got a story to tell,
  'Bout a rare condition, prepubertal boys can dwell.
  This 3-year old dude, healthy and lean,
  But he had a breast mass, the largest ever seen.
  
  Measuring 9 by 6 by 4, it was no joke,
  Unilateral cystic beast, man, it made folks choke.
  Lymphatic malformation, they thought at first,
  Tried sclerotherapy with Picibanil, but no burst.
  
  No effect on the size, it stayed the same,
  So they took a different route, no time for games.
  They excised that mass, cut it out real clean,
  Pathological exam showed mammary gland, it seemed.
  
  Idiopathic gynecomastia, that's what they found,
  The tissue in his chest, it was profound.
  But here's the kicker, the real twist in this tale,
  FISH revealed mosaicism, XXY, the cells did unveil.
  
  In the breast, abnormal epithelial cells did show,
  But not in the blood, man, that's the way it goes.
  So remember this case, it's rare but it's true,
  Breast enlargement in prepubertal boys, it can ensue.