Welcome to HCM.
The scan and the pain are suggestive of stone in the ureter
1. Blood tests to look at kidney function.
2. Plain xray and CT scan
of the kidneys and urinary tract
Based on the report an clinical progress, treatment is necessary.
Till then he needs
1. Pain killers.
2. Oral fluids liberally if there is no vomiting
Wishing him best health,