Final answer:
One possible finding that could suggest neuroblastoma is enlarged lymph nodes in the abdomen.
Step-by-step explanation:
Neuroblastoma is a type of cancer that commonly affects children. It arises from immature nerve cells and can present with various symptoms. In the case of the 3-year-old boy with a swollen right side of the abdomen, one possible finding that could suggest neuroblastoma is enlarged lymph nodes in the area. Swollen lymph nodes can be palpated by a healthcare provider during a physical examination.