Hello,
Enlarged mesenteric lymph nodes can be due to various reasons like bacterial infection, allergy, tuberculosis etc. If the constipation is persistent and there is diagnostic dilemma then one can safely go ahead with CT scan. With new machines radiation exposure is quite low.
Next Steps
I would prefer to give a course of antibiotics before getting a CT scan done
Health Tips
if you want to discuss it further you can book a Consult