Which type of brachytherapy uses a radioactive seed that remains in place?

Permanent brachytherapy involves the implantation of radioactive seeds or sources that are designed to remain in the tissue for an extended period, often for the entire lifespan of the seeds. These seeds emit radiation over time to target and destroy cancerous cells while minimizing exposure to surrounding healthy tissue. This technique is particularly common in the treatment of prostate cancer, where small seeds are placed directly into the prostate gland.

The advantage of permanent brachytherapy is that it provides a continuous dose of radiation over an extended period without the need for frequent re-treatment. This method contrasts with temporary brachytherapy, where sources are inserted for a limited time and then removed after the treatment dose has been delivered.

Understanding the characteristics of different brachytherapy techniques is crucial. Temporary brachytherapy uses sources that are removed after treatment, and interstitial brachytherapy typically refers to the placement of radiation sources within the tissue but does not specifically indicate whether those sources are temporary or permanent. Intraductal brachytherapy pertains to a specific application within the breast, focusing on localized delivery. Each type has distinct applications and procedural implications, making clarity on their differences essential in clinical practice.