What is PI-RADS in an MRI prostate report?

PI-RADS stands for Prostate Imaging – Reporting and Data System. It is a standardized scoring system used by radiologists to report MRI prostate results. The score ranges from 1 to 5 and indicates the likelihood of clinically significant prostate cancer, helping urologists and patients make informed decisions about whether a biopsy is needed.

What does PI-RADS 1 and PI-RADS 2 mean?

PI-RADS 1 means the finding is most probably not cancer, and PI-RADS 2 means probably not cancer. Both scores carry a 0% chance of aggressive prostate cancer based on published US data from 2018. Biopsy is generally not recommended at these levels.

What does PI-RADS 3 mean on a prostate MRI?

PI-RADS 3 is an indeterminate finding, meaning the result is uncertain. It carries an 8.9% chance of aggressive prostate cancer. A biopsy may be recommended at this level and requires careful discussion between the urologist and patient.

What does PI-RADS 4 or PI-RADS 5 mean?

PI-RADS 4 means the finding is probably cancer, with a 21.4% chance of aggressive prostate cancer. PI-RADS 5 means the finding is most probably cancer, with a 62.7% chance of aggressive prostate cancer. Biopsy is strongly recommended for both scores.

Why is MRI prostate done before a biopsy?

MRI prostate helps identify which patients truly need a biopsy, avoiding unnecessary procedures in men who do not have cancer. Prostate biopsy carries risks including rectal pain, rectal bleeding, bloody urination, and rarely, serious bloodstream infection. MRI helps prevent these unnecessary complications.

At what PI-RADS score should I get a prostate biopsy?

Based on current evidence, a prostate biopsy is generally recommended for patients with a PI-RADS score of 3 or higher. However, the final decision should always be made jointly between the patient and their urologist, taking into account other clinical factors such as PSA level and age.

Prostate MRI: What PI-RADS Scores Mean

最后更新： 2026年6月9日

Soarawee Weerasopone，泌尿科医生

曼谷医院总部，曼谷

Samitivej Sriracha 医院, 春武里府

LINE联络

由于现在医疗关注和健康促进计划非常活跃，很多怀疑患有前列腺癌的先生都会推荐到我的泌尿科办公室就诊。过去，当我们怀疑他们患有前列腺癌时，我们只有一种推荐方法，那就是介绍他们做前列腺组织活检。从那时起，并非所有患者都能通过活检得到前列腺癌阳性结果！这让我们非常苦恼，因为我们不能让一个没有前列腺癌的人接受不必要的活组织检查，从而导致这些并发症，这对他是非常不公平的。

直肠痛
直肠出血
血尿
罕见但严重的并发症——活检过程中的血流感染

不必要的前列腺癌活检可能会发生不必要的并发症。

目前，前列腺MRI是明确需要做活检的患者的必备工具，今天我们就来讨论一下前列腺MRI结果的解读。当训练有素的放射科医师对 MRI 前列腺进行报告时，他们将始终报告为称为“PI-RADS”的系统，它代表“前列腺成像 - 报告和数据系统”。 PI-RADS 评分将报告为 1 到 5 之间的值，根据可疑前列腺癌的水平变化，这将为泌尿科医生和患者共同做出决定增加大量信息。以下是侵袭性前列腺癌活检结果阳性的解释方法和可能的机会（基于美国 2018 年的文献）

前列腺癌可以通过 MRI 前列腺模态准确检测。

MRI 前列腺结果解读

PI-RADS 1 – 很可能不是癌症 – 0% 侵袭性前列腺癌的机会
PI-RADS 2 – 可能不是癌症 – 0% 侵袭性前列腺癌的机会
PI-RADS 3 – 不确定癌症 – 8.9% 发生侵袭性前列腺癌的几率
PI-RADS 4 – 可能是癌症 – 侵袭性前列腺癌的几率为 21.4%
PI-RADS 5 – 最有可能的癌症 – 62.7% 侵袭性前列腺癌的机会

从数据中可以看出，对于PI-RADS评分至少为3分的人，必须推荐活检。无论如何，这只是一个附加数据，需要泌尿科医生和患者之间仔细咨询。任何问题，您都可以与您信任的泌尿科医生讨论，如果您给我发短信，我将很荣幸。下篇文章见！

你可以访问我的官方网站这里.

If you have an elevated PSA or need MRI prostate evaluation for prostate cancer screening, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. 预约咨询.

**免责声明：** 本内容由曼谷医院总院的认证泌尿科医生 Soarawee Weerasopone 医生撰写和审阅。本内容仅用于教育目的，不构成医疗建议。在开始任何医疗治疗前，请务必咨询合格的医疗专业人士。.

医学撰写与审阅： 素瓦瑞·维拉宋蓬医生（Pom医生）— 曼谷医院总部认证泌尿科医生。国际学者：贝勒医学院（美国）· 顺天堂大学（日本）· 长庚纪念医院（台湾）。.