Hello - thanks for asking your question.
You note dull right sided pain. There is blood in the urine. A CT scan was done a year ago. It is certainly possible that something may have developed in the interval period.
In any case, any possibility of blood in the urine (hematuria) in a 55 yo male needs to be comprehensively evaluated. Causes includes a kidney stone, intrinsic kidney disease, urinary tract disease (i.e. infection), or bladder disease.
I would first evaluate for a kidney stone, either with an ultrasound or spiral CT scan.
If that was negative, then tests for cancer (i.e. bladder cancer) should be considered with urine cytology or cystoscopy.
I would also consider a kidney ultrasound to evaluate for intrinsic kidney disease that can also cause blood in the urine.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.