My father began prostate & bladder issues in 2013. 2day the doctor said he notice a small dot from the ultra sound on his bladder. what could b the causes of a dot from the ultra sound on his bladder?

Growth: Of concern would be a growth such as a polyp or cancerous lesion. A urologist is best qualified to review the ultrasound and determine whether a cystoscopy with a biopsy is advisable. A cytology examination of the urine looking for malignant cells could be done, but if negative it still wouldn't rule out a malignant growth and a cystoscopy of the bladder is still the most conclusive test.

Many: A small spot on ultrasound for bladder could be many things a tumor cyst a bladder stone or a cancer. See your urologist for specific diagnosis and treatment