A 5-year-old child was admitted to the hospital for prolapsing rectal mass and painless rectal bleeding. Histopathological examination reveals enlarged and inflamed glands filled with mucin. What is the likely diagnosis?

Explanation

## Correct Answer: B. Hamartoma In a 5-year-old child presenting with prolapsing rectal mass and painless rectal bleeding, the clinical picture strongly suggests a **juvenile polyp**, which is a type of hamartoma. The key discriminating feature is the age (young child) combined with the histopathological finding of "enlarged and inflamed glands filled with mucin." Hamartomas are benign tumors composed of tissue elements normally present in that organ but arranged haphazardly. Juvenile polyps are the most common colorectal polyps in children and typically present between ages 2–10 years with rectal bleeding and prolapse. The histology shows dilated, mucin-filled glands with inflamed lamina propria—exactly matching the description. These polyps are usually solitary, located in the rectosigmoid region, and have an excellent prognosis with spontaneous regression or simple polypectomy. Unlike adenomas (which show dysplasia), hamartomas lack malignant potential. The painless bleeding occurs due to mechanical trauma and mucosal ulceration from the prolapsing mass. This is a classic presentation in Indian pediatric surgical practice and aligns with guidelines from the Indian Academy of Pediatrics regarding colorectal polyps in children. ## Why the other options are wrong **A. Adenoma** — Adenomas show dysplastic epithelium with loss of normal glandular architecture and are premalignant lesions. While they can present with bleeding, adenomas are rare in 5-year-old children and typically occur in older age groups. The histology described (inflamed glands filled with mucin without dysplasia) is inconsistent with adenoma. NBE may trap students who see 'glands' and think adenoma, but the age and benign histology exclude this. **C. Choristoma** — Choristomas are ectopic tissues—normal tissue in an abnormal location (e.g., gastric mucosa in the ileum). They do not typically present as prolapsing rectal masses in children and lack the characteristic mucin-filled gland pattern described. Choristomas are rare in the rectum and would not explain the clinical presentation. This is a distractor for students confusing hamartoma (disorganized normal tissue) with choristoma (normal tissue in wrong place). **D. Carcinoma** — Colorectal carcinoma is extremely rare in a 5-year-old child and typically presents in adults >50 years. The painless, self-limited bleeding and benign histology (no malignant cells, no dysplasia) rule out carcinoma. The prolapsing nature and spontaneous regression potential are hallmarks of benign juvenile polyps, not malignancy. NBE uses age as a red herring to test whether students apply age-appropriate differential diagnosis. ## High-Yield Facts - **Juvenile polyps** are the most common colorectal polyps in children, presenting between ages 2–10 years with rectal bleeding and prolapse. - **Hamartomas** are benign tumors of disorganized normal tissue elements; juvenile polyps are hamartomas with **zero malignant potential**. - Histology of juvenile polyps shows **dilated mucin-filled glands with inflamed lamina propria**, not dysplasia. - **Painless rectal bleeding** in a child with a prolapsing mass is classic for juvenile polyp; adenomas and carcinomas are rare at this age. - Management is **polypectomy or observation** (many regress spontaneously); no chemotherapy or radical surgery needed. ## Mnemonics **HAM = Hamartoma** **H**aphazard arrangement of **A**ll normal tissue **M**ixed together. Benign, no dysplasia, no malignant potential. Use when you see 'disorganized normal tissue' in a young child. **JPP Rule: Juvenile Polyp Profile** **J**uvenile (age 2–10), **P**rolapsing mass, **P**ainless bleeding = Hamartoma. Differentiates from adenoma (older age, dysplasia) and carcinoma (rare in children). ## NBE Trap NBE pairs 'glands' and 'mucin' with adenoma to trap students who focus on histological terminology rather than age and dysplasia status. The key is recognizing that inflamed glands WITHOUT dysplasia in a young child = hamartoma, not adenoma. ## Clinical Pearl In Indian pediatric practice, a child brought with 'blood in stool and something coming out of the rectum' is a juvenile polyp until proven otherwise. Most regress spontaneously or are easily removed endoscopically—reassuring parents that this is NOT cancer is crucial for compliance and reducing anxiety. _Reference: Bailey & Love Ch. 71 (Colorectal polyps in children); OP Ghai Ch. 14 (Pediatric GI surgery)_