Rectal Spacing for Prostate Cancer: Protecting the Rectum During Radiation Therapy

Introduction: Reducing Side Effects While Preserving Effective Treatment

Radiation therapy is one of the most effective and widely used treatments for localized prostate cancer. Options such as brachytherapy (internal radiation) and external beam radiation therapy (EBRT) offer excellent long-term cancer control for appropriately selected patients.

However, because the prostate sits directly in front of the rectum, radiation treatment can expose the rectal wall to unintended doses of radiation. This proximity creates a risk of bowel-related side effects that can impact quality of life during and after treatment.

Rectal spacing is an important advancement designed to address this issue. By physically increasing the distance between the prostate and rectum, it helps reduce radiation exposure to surrounding healthy tissue while maintaining effective cancer treatment.

Why Rectal Protection Matters in Radiation Therapy

Both brachytherapy and external beam radiation are designed to precisely target prostate cancer, but even with modern techniques, some radiation can reach adjacent structures. The rectum is particularly vulnerable due to its location immediately behind the prostate.

Potential rectal side effects of radiation therapy may include:

• Rectal irritation or discomfort
• Increased bowel frequency or urgency
• Loose stools or diarrhea
• Fecal incontinence
• Rectal bleeding
• Long-term changes in bowel habits (less common but important)

While many of these effects are temporary, some can persist or develop later. Reducing radiation exposure to the rectum is therefore a key goal in treatment planning.

What Is Rectal Spacing?

Rectal spacing is a minimally invasive procedure that creates temporary space between the prostate and rectum before radiation therapy begins. This added separation significantly reduces the amount of radiation that reaches the rectal wall.

At Atlanta Prostate Center, we use Barrigel™, an FDA-approved rectal spacer designed specifically for prostate cancer radiation treatment.

Barrigel is a soft, biocompatible gel that is injected into the space between the prostate and rectum. Once placed, it gently pushes the rectum away from the prostate by several millimeters to centimeters, creating a protective buffer during radiation delivery.

How the Rectal Spacing Procedure Works

Rectal spacing with Barrigel is a straightforward outpatient procedure that is typically completed in about 15 minutes.

Procedure Overview

• Performed under anesthesia for patient comfort
• A small needle is used to precisely place the gel between the prostate and rectum
• Real-time imaging guidance ensures accurate placement
• Gold fiducial markers are often placed at the same time, for the radiation oncologist to accurately orient the prostate during each radiation treatment
• No incisions are required

Recovery

• Patients go home the same day
• Most men return to normal daily activities within 24 to 48 hours
• Minimal downtime and discomfort

The procedure is designed to integrate seamlessly into the overall treatment timeline and is usually performed prior to starting radiation therapy.

How Effective Is Rectal Spacing?

Clinical studies have shown that rectal spacing significantly reduces radiation dose to the rectum during both brachytherapy and external beam radiation therapy.

Key benefits include:

• Lower rates of rectal irritation and bowel symptoms
• Reduced risk of long-term rectal complications
• Improved overall quality of life during and after treatment

By creating even a small amount of separation, rectal spacing can meaningfully decrease radiation exposure to sensitive tissue without compromising cancer control.

Who Should Consider Rectal Spacing?

Rectal spacing is typically recommended for men undergoing:

• External beam radiation therapy (EBRT)
• Brachytherapy

It is particularly valuable for patients who:

• Want to minimize treatment-related side effects
• Have concerns about bowel function or quality of life
• Are candidates for higher-dose or more targeted radiation approaches

A consultation with a prostate cancer specialist is necessary to determine whether rectal spacing is appropriate based on individual anatomy and treatment goals.

Safety and Insurance Coverage

Barrigel is FDA-approved for use as a rectal spacer in prostate cancer radiation therapy. It is made of a biocompatible material that remains in place during treatment and is gradually absorbed by the body over time.

In most cases, rectal spacing is covered by insurance, making it an accessible option for patients seeking to reduce radiation-related side effects.

Complications from the procedure are uncommon when performed by an experienced team. As with any procedure, there are small risks, but these are generally minimal and well-managed.

Conclusion

Rectal spacing represents a meaningful advancement in prostate cancer care, allowing patients to benefit from highly effective radiation treatments such as brachytherapy and external beam radiation while reducing the risk of bowel-related side effects.

With a quick outpatient procedure, minimal recovery time, and proven ability to protect surrounding tissue, rectal spacing has become an important consideration for men planning radiation therapy.

As with all prostate cancer treatments, the decision to include rectal spacing should be made through a personalized discussion with an experienced specialist who can align treatment options with your specific diagnosis and quality-of-life priorities.