Final answer:
Mesenteric adenitis is a condition that can cause pain in the RLQ when palpated in the LLQ. It is characterized by inflammation of the lymph nodes in the mesentery of the abdomen.
Step-by-step explanation:
The condition described in the question is likely mesenteric adenitis, which is inflammation of the lymph nodes in the mesentery of the abdomen. Mesenteric adenitis can cause pain in the lower right quadrant (RLQ) of the abdomen when palpated in the lower left quadrant (LLQ). This condition often occurs in children and presents with symptoms such as abdominal pain, fever, and swollen lymph nodes.