(This video shows how a CT scan is done in a child to see the size of the adenoid, the patency of the airway, the condition of the sinus etc.)
The adenoids can be easly evaluated by nasal endoscopy, and if not tolerated, Xrays and Sinus CAT scans.
CT Scan of adenoid is better than doing X-ray lateral Neck. It will give better idea about the septum, turbinates and sinuses. This is done in Jubilee Hospital, Trivandrum, South India.