Prostatitis MRI mainly shows focal or diffuse T2WI low signal in the peripheral band, mildly restricted DWI, and equal or low signal ADC. Prostatitis is mostly caused by infections such as bacteria or Chlamydia trachomatis, and the inflammation will put the prostate in a swollen and congested state. The normal peripheral band of the prostate is high signal in T2WI, while due to swelling and congestion of the prostate, the peripheral band shows abnormal low signal on the T2WI map of magnetic resonance imaging (MRI), which may show diffuse, multifocal or focal low signal, and there may also be signal unevenness in the central band. Due to the swelling, the peripheral bands may also have a mild diffusion-weighted imaging (DWI) first, i.e., equal or slightly high signal on DWI and equal or slightly low signal on apparent diffusion coefficient (ADC). Currently, the diagnosis of prostatitis is mostly based on clinical manifestations, rectal fingerprinting, prostate fluid and urine examination, and imaging also often uses ultrasonography, while MRI is mostly used for differential diagnosis with other prostate diseases such as prostate cancer.