Thanks for writing in.
I suppose your dad is an elderly gentleman who had a fall 7 months back.
In elderly men, the prostate
gland often enlarges and creates a sensation of incomplete emptying of the bladder. It is located at the base of urinary bladder
and when enlagred in size, causes obstruction to the outflow of urine.
In such patiens, MRI, colonoscopy
and rest of ultrasound
findings can be normal.
I suggest you get your dad to take another ultrasound keeing in mind the evaluation of prostate gland. Also pre void and post void urine volume is to be assessed.
You can consult an urologist
for further diagnosis and medication.
Hope this helps.