If you have prostate cancer and a large prostate, you may wonder whether robotic surgery is still possible. A larger gland can make the operation more technically challenging, but prostate size alone does not usually mean that robotic surgery is unsuitable.
Your surgeon may have less working space and may need to adjust parts of the procedure, particularly around the bladder neck. Larger prostates can sometimes mean longer surgery or greater blood loss, but your PSA, Grade Group, MRI findings, cancer stage, general health and your surgical team’s experience are also important when deciding whether robotic surgery is right for you.
What Is Considered a Large Prostate?
There is no single universally accepted size that defines a ‘large’ prostate for robotic prostatectomy. Studies use different thresholds and measurement methods: some use imaging-based prostate volume in millilitres, while others group patients according to the weight of the removed prostate specimen in grams. These measurements are related but should not be treated as interchangeable.
Your prostate size may be measured using an MRI or ultrasound and reported in millilitres or cubic centimetres. Your surgeon will also consider the shape of your prostate, any prominent median lobe and the available space in your pelvis when planning surgery.
Can You Still Have Robotic Prostatectomy With a Large Prostate?
Yes, in many cases. A large prostate can make robotic prostatectomy more technically challenging, but it does not automatically mean that you cannot have the operation.
Studies suggest that robotic surgery can still be performed in men with very large prostates, although you may have a longer operation, greater blood loss or a longer period with the catheter. Your surgeon will consider your prostate size alongside your cancer, anatomy, general health and their experience with complex robotic surgery.
Why Can a Large Prostate Make Surgery More Difficult?
A larger prostate leaves less working space in the pelvis, making dissection around nearby structures more technically demanding.
Robotic surgery provides magnified three-dimensional vision and precise instruments, helping your surgeon work safely in this confined space.
How a Large Prostate May Affect Robotic Surgery
| Surgical consideration | How a large prostate may affect it |
| Working space | A larger gland can leave less room for the surgeon to work within the pelvis |
| Bladder-neck dissection | The bladder neck may be wider or more difficult to separate, particularly if a prominent median lobe is present |
| Bladder-neck reconstruction | Additional reconstruction may sometimes be needed before the bladder is reconnected to the urethra |
| Operating time | Extra dissection and reconstruction can make the procedure take longer |
| Blood loss | Larger prostates have been associated with somewhat greater blood loss in some studies |
| Nerve preservation | Nerve-sparing may be technically more demanding, although cancer location and stage remain key considerations |
| Catheter duration | More extensive bladder-neck reconstruction may sometimes mean keeping the catheter in for longer |
| Prostate removal | A very large prostate may require a slightly larger extraction incision while the main operation remains robotic |
Why Does a Large Median Lobe Matter?
A prominent median lobe can grow into the bladder and alter bladder-neck anatomy, making tissue planes harder to identify.
It does not usually prevent robotic prostatectomy, although bladder-neck reconstruction may be needed and MRI can help with surgical planning.
How Can Prostate Size Affect the Bladder Neck?
The bladder neck is the opening at the base of your bladder where it joins the urethra, immediately above the prostate. If you have a large prostate or prominent median lobe, this area can be more difficult to separate during surgery and the opening may be wider than usual.
Your surgeon may therefore need to reconstruct or narrow the bladder neck before reconnecting your bladder to the urethra. This is a recognised surgical step rather than necessarily a complication, and careful planning helps protect nearby structures such as the ureteric openings.
Does a Large Prostate Make the Operation Longer?
A larger prostate can increase operating time because your surgeon may need longer for dissection and bladder-neck reconstruction. More complex anatomy can require additional care during these stages of the operation.
A longer operation does not necessarily mean something has gone wrong. It may simply reflect the extra time needed to complete the surgery safely.
Is There More Blood Loss With a Large Prostate?
You may have slightly more blood loss if you have a larger prostate. Studies have found higher average blood loss in men with larger glands, including those with prostates weighing more than 150 grams.
However, this does not mean you will necessarily have significant bleeding. Your blood loss depends on factors such as your anatomy, surgical technique and general health, so your surgeon will assess your overall risk rather than prostate size alone.
Does a Large Prostate Make Cancer Removal Less Effective?
Not necessarily. A larger prostate can make robotic surgery more technically challenging, but this does not automatically mean that your cancer is less likely to be completely removed.
Research does not show that a larger prostate automatically increases the risk of a positive surgical margin, which means cancer cells are found at the cut edge of the removed tissue. Several studies have reported similar or even lower positive-margin rates in larger glands, although differences in tumour stage, Grade Group and patient characteristics can influence these findings.
Does Prostate Size Affect the Risk of Cancer Recurrence?
Having a large prostate does not necessarily mean you have a higher risk of prostate cancer returning after robotic prostatectomy. Studies have not consistently found prostate size itself to be a significant predictor of biochemical recurrence, meaning a rise in PSA after treatment that can indicate the cancer has returned.
Your long-term risk depends more on factors such as your cancer stage, Grade Group, surgical margins and lymph-node status. Your final pathology and follow-up PSA will therefore give you a much clearer picture of your individual recurrence risk.
Evidence Note
A 2024 single-centre study of 14,481 men undergoing robot-assisted radical prostatectomy compared prostate specimen weights from below 50 g to above 150 g. Men in the largest-prostate group had lower rates of full nerve sparing and lower recovery rates for urinary continence and sexual function, but they also had lower positive-margin and biochemical-recurrence rates than men with the smallest glands. The retrospective design means these differences cannot be attributed to prostate size alone.
A 2026 multicentre study of 201 men with prostate volumes above 100 mL also supported the feasibility of RARP in very large prostates. Continence recovery reached 84.1% at 12 months and 90.6% at five years, while Grade Group, pT3 stage and positive surgical margins, rather than prostate volume, independently predicted biochemical recurrence. These figures are useful for counselling but should not be used to predict an individual patient’s outcome.
Does a Large Prostate Affect Urinary Continence Recovery?
A larger prostate may be associated with slower or lower urinary continence recovery after robotic prostatectomy, particularly in very large glands. However, studies are not completely consistent, and outcomes also depend on factors such as age, urethral length, nerve preservation, bladder-neck technique and surgeon experience.
It is also important to distinguish post-operative continence from any urinary symptoms you had before surgery because of prostate enlargement. Your surgeon can explain how your baseline urinary function and individual anatomy may affect your recovery after the operation.
Can You Still Have Nerve-Sparing Surgery With a Large Prostate?
Yes, you may still be able to have nerve-sparing surgery with a large prostate. The main consideration is where your cancer is located and whether it appears close to the nerves that control erections, rather than prostate size alone.
A larger prostate can make the dissection more technically demanding, but your MRI, biopsy results, cancer stage and preoperative erectile function will also guide the decision. Your surgeon can explain whether preserving one or both sides is appropriate without compromising cancer removal.
Does Prostate Size Affect Erectile Function After Surgery?
A very large prostate can make nerve-sparing more technically difficult, and some studies have reported lower rates of nerve preservation and sexual-function recovery in men with the largest glands. However, prostate size is only one part of the picture.
Your age, erectile function before surgery, cancer location and stage, general health and whether one or both neurovascular bundles can be safely preserved are also important. Erectile recovery can take time even after successful nerve-sparing surgery, and your team can discuss penile rehabilitation or other treatments if needed.
Will You Need a Catheter for Longer?
After robotic prostatectomy, you will usually have a catheter to drain your bladder while the new bladder-to-urethra connection heals. The catheter is often removed around 7 to 10 days after robotic prostatectomy, although the exact timing varies between centres and may be longer if the bladder-to-urethra connection needs more time to heal.
If you have a very large prostate, you may need more bladder-neck reconstruction, which can sometimes mean keeping the catheter in for longer. Your surgeon will decide when it is safe to remove it based on how your operation went and how well the connection is healing.
Will Recovery Take Longer With a Large Prostate?
A large prostate does not necessarily mean your overall recovery will be much longer. However, some early stages of recovery may take more time if your operation is more complex.
- Catheter time: You may need the catheter for longer if additional bladder-neck reconstruction is required.
- Urinary control: Continence recovery may be slightly slower during the early months.
- Energy levels: A longer or more complex operation may affect how quickly your energy returns.
- Daily activities: Your surgeon will advise when you can safely return to driving, work and exercise.
Recovery varies from person to person. Your general health, surgical complexity and individual healing will all influence your recovery time.
How Will Your Surgeon Plan Surgery for a Large Prostate?
Your surgeon will usually review your MRI, PSA, biopsy Grade Group and cancer stage before surgery. Your MRI can show the prostate size and shape, any prominent median lobe and how the cancer relates to nearby structures.
Previous prostate procedures such as TURP or HoLEP, a prominent median lobe and existing urinary symptoms can also affect surgical planning. Prior surgery may alter tissue planes and bladder-neck anatomy, while a large median lobe can make bladder-neck preservation more challenging. Your surgeon will therefore plan the operation around your individual anatomy rather than prostate size alone.
Will a Larger Prostate Require a Bigger Incision?
Robotic prostatectomy is performed through several small abdominal ports, but your prostate still needs to be removed through one of the incisions. If you have a very large prostate, this extraction incision may need to be slightly bigger.
This does not mean your operation becomes open surgery. The main procedure can still be performed robotically through the keyhole ports, while your recovery will depend on the size of the incision, your general health and how smoothly the operation goes.
Why Does Your Surgeon’s Experience Matter With a Large Prostate?
A large prostate can create challenging anatomy, including a prominent median lobe, difficult bladder neck or limited working space. Your surgeon may therefore need to adapt parts of the procedure to your individual anatomy.
Experience with complex robotic prostatectomy can be particularly useful in these situations. You can ask whether your surgeon regularly operates on men with large prostates and how your prostate size may affect the planned approach.
UK Guidance Note
Current NICE prostate cancer recommendations do not specify a prostate-volume cutoff above which radical prostatectomy cannot be performed. Treatment suitability is based on your cancer, overall health, expected benefit and potential side effects. NICE also recommends a urological assessment before radical treatment if you have troublesome urinary symptoms.
European guidance similarly does not identify a large prostate as an automatic contraindication to radical prostatectomy. However, it notes that features such as a large median lobe or previous TURP can make bladder-neck preservation more challenging, so individual anatomy should be considered when planning the operation.
What Should You Ask Before Choosing Robotic Surgery?
If you have a particularly large prostate, ask your surgeon how its size may affect your individual operation. You can ask whether you have a prominent median lobe, whether bladder-neck reconstruction is likely and whether you may need a longer catheter period.
It is also important to understand how your cancer affects the surgical plan, including nerve sparing and cancer clearance. Your surgeon should explain what prostate size may make more challenging and what it is unlikely to change.
Myth vs Fact
| Myth | Fact |
| A large prostate means you cannot have robotic prostatectomy. | No. Large and even very large prostates can be treated robotically in appropriately selected patients, although the operation may be more technically demanding. |
| A larger prostate automatically means a higher positive-margin rate. | No. Current evidence does not show higher positive-margin rates simply because the prostate is larger, and some studies have reported lower rates in larger glands. |
| Prostate size does not affect continence recovery at all. | Not necessarily. Evidence is mixed, but large contemporary cohorts have reported lower continence recovery in men with very large prostates, while other studies have found smaller or no long-term differences. Age, anatomy and surgical technique also influence recovery. |
| Nerve sparing depends only on where the cancer is. | Cancer location is critical, but very large prostate size can make nerve preservation technically more difficult and has been associated with lower full nerve-sparing rates. |
| A prominent median lobe prevents robotic surgery. | No. It may make bladder-neck dissection and reconstruction more difficult, but experienced teams can usually manage this anatomy robotically. |
| A previous TURP or HoLEP is the same issue as simply having a large prostate. | No. Previous prostate surgery can alter tissue planes and bladder-neck anatomy and should be considered separately during surgical planning. |
Key Takeaways
- There is no single universally accepted size threshold for a “large” prostate, and imaging volume in mL is not identical to postoperative specimen weight in grams.
- A large prostate does not automatically rule out robotic radical prostatectomy.
- Larger glands can increase operating time, blood loss and the likelihood of bladder-neck reconstruction or a longer catheter period.
- Current evidence does not show that large prostate size automatically increases positive surgical margins or biochemical recurrence.
- Evidence on continence and erectile recovery is mixed, particularly with very large glands above 150 g.
- A prominent median lobe can make bladder-neck dissection more complex but does not generally prevent robotic surgery.
- Previous TURP or HoLEP should be considered separately because prior surgery can alter the surgical planes.
- Cancer stage, Grade Group, tumour location, baseline function and surgical planning remain important alongside prostate size.
Frequently Asked Questions
1. Can you have robotic prostate surgery with a large prostate?
Yes, you can often still have robotic prostatectomy with a large prostate. The operation may be more technically challenging, but prostate size alone does not usually rule out surgery. Your cancer stage, MRI findings and overall health also matter.
2. What is considered a large prostate for robotic surgery?
There is no single size that defines a large prostate for robotic surgery. Some studies use imaging-based prostate volume in millilitres, while others use the weight of the removed prostate specimen in grams. Your surgeon will consider the measured size together with prostate shape, pelvic anatomy and your cancer.
3. Does a large prostate make robotic surgery more difficult?
Yes, a larger prostate can leave your surgeon with less working space in the pelvis. It may also make areas such as the bladder neck more technically challenging. Robotic technology provides magnified three-dimensional vision and precise instrument control during the procedure.
4. Can a large prostate make the operation take longer?
It can. Your surgeon may need more time for dissection, bladder-neck work or reconstruction. A longer operation does not necessarily mean that something has gone wrong.
5. Does a large prostate increase blood loss during surgery?
A larger prostate may be associated with slightly greater blood loss during robotic prostatectomy. However, your individual blood loss depends on several factors, including your anatomy and surgical technique. Your surgeon will assess your overall risk before surgery.
6. Can you still have nerve-sparing surgery with a large prostate?
Yes, nerve-sparing surgery may still be possible if it is safe from a cancer-control perspective. Your MRI, biopsy findings, tumour location and cancer stage are central to deciding whether nerve sparing is oncologically safe. A very large prostate can also make nerve preservation technically more difficult.
7. Does a large prostate affect urinary continence recovery?
A large prostate may be associated with slower or lower continence recovery after robotic prostatectomy, particularly in very large glands, although studies are not completely consistent. Your age, baseline urinary function, anatomy, nerve preservation and surgical technique also influence how quickly urinary control returns.
8. Will you need a catheter for longer after surgery?
You will usually have a catheter for around 7 to 10 days while the bladder-to-urethra connection heals, although timing varies between centres and patients. If your surgery involves more bladder-neck reconstruction, your surgeon may recommend keeping it in for longer.
9. Does a large prostate make prostate cancer harder to remove?
Not necessarily. A large prostate can make the operation more technically demanding, but it does not automatically mean that cancer removal will be less effective. Your cancer stage, Grade Group, tumour location and surgical margins are more important.
10. Does a large prostate mean you will have a longer recovery?
Not necessarily. You may have a slightly more complex early recovery, particularly if you need additional bladder-neck work or a longer catheter period. Your overall recovery will also depend on your general health and how your surgery progresses.
Final Thoughts: What Does Having a Large Prostate Mean for Your Surgery?
Having a large prostate does not necessarily mean you cannot have robotic prostate surgery. While a larger gland can make certain parts of the operation more technically challenging, your surgeon will consider your prostate size alongside your MRI findings, cancer stage, general health and individual anatomy when planning your treatment.
If you are considering robotic prostate surgery in London, you can contact our team to discuss how your prostate size may affect the procedure and recovery. We can arrange a consultation to review your individual circumstances and consider whether robotic surgery may be suitable for you.
References:
- Jaber, A.R. et al. (2024) ‘Impact of Prostate Size on the Functional and Oncological Outcomes of Robot-assisted Radical Prostatectomy’, European Urology Focus, 10(2), pp. 263–270. Available at: https://pubmed.ncbi.nlm.nih.gov/38290859/
- Gamal, A. et al. (2025) ‘Functional and Oncological Outcomes of Very Large Prostate Sizes Post Robotic Radical Prostatectomy: A Propensity Score-Matched Analysis’, The Prostate, 85(5), pp. 456–462. Available at: https://pubmed.ncbi.nlm.nih.gov/39733346/
- Rabie, A. et al. (2026) ‘Robotic-assisted radical prostatectomy for large-volume prostates (>100 mL): perioperative, functional, and oncologic outcomes from a 5-year multicenter cohort’, Journal of Robotic Surgery, 20(1), 662. Available at: https://pubmed.ncbi.nlm.nih.gov/42474561/
- Fahmy, O. et al. (2021) ‘Impact of Prostate Size on the Outcomes of Radical Prostatectomy: A Systematic Review and Meta-Analysis’, Cancers, 13(23), 6130. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC8656835/
- National Institute for Health and Care Excellence (2019, updated 2021) Prostate cancer: diagnosis and management. NICE guideline NG131. Available at: https://www.nice.org.uk/guidance/ng131
- European Association of Urology (2026) EAU Guidelines on Prostate Cancer. EAU Guidelines Office, Arnhem, The Netherlands. Available at: https://uroweb.org/guidelines/prostate-cancer