pni-rads分级是 prostate ultrasound report on the structure of the prostate， which is a method for evaluating the risk of prostate cancer by analyzing the appearance of prostate nodules.
1.pni-rads 1： All nodules are hypoechoic， with no obvious signs of cancer.It is generally recommended to follow up once a year.
2.pni-rads 2： There is a small hypoechoic nodule， which is likely benign.It is recommended to follow up every 6-12 months.
3.pni-rads 3： There may be a suspicious nodule， but the probability of cancer is less than 1%.Biopsy is not recommended for now， but close follow-up is required.
4.pni-rads 4： Suspicious nodules， with a cancer probability of 10-50%.Biopsy is recommended.
5.pni-rads 5： Highly suspicious of cancer， with a cancer probability greater than 50%.Biopsy is strongly recommended.
For special populations， such as elderly patients with comorbidities， the risk of biopsy complications should be considered， and the decision should be made by a urologist.Young patients should pay more attention to follow-up and monitoring of nodules.Patients with obvious symptoms should seek medical attention promptly.
