Fossa navicularis stricture is a narrowing in the distal urethra within the glans, just behind the urinary opening. It can cause a thin or spraying stream, straining and difficulty directing urine. Lichen sclerosus, instrumentation and previous hypospadias surgery are important causes. Treatment depends on how far the scar extends: short distal disease may be managed with meatoplasty, while longer or recurrent strictures often need oral mucosal graft reconstruction, sometimes in stages.

What is a fossa navicularis stricture?

It is scar narrowing in the terminal urethra within the glans. Because it is part of the distal/penile urethra, reconstruction must consider both urinary function and the shape of the glans and meatus.

What patients commonly notice

• Spraying or forked urinary stream.
• Very narrow stream despite a good bladder urge.
• Visible distal scarring.
• Pain or splitting at the meatus in inflammatory disease.
• Previous distal urethral surgery.

Where is the fossa navicularis?

The fossa navicularis is the widened final part of the urethra inside the glans, just before the meatus. A stricture here is slightly deeper than isolated meatal stenosis and can extend into the distal penile urethra.

Common causes

• Lichen sclerosus.
• Previous catheterisation or transurethral instruments.
• Hypospadias surgery or other distal urethral reconstruction.
• Local inflammation, trauma or previous surgery.

Why diagnosis needs more than looking at the meatus

The external opening may appear acceptable while a deeper fossa narrowing remains. Calibration, small-calibre endoscopy or urethrography can help establish proximal extent. The condition of the glans and urethral plate also influences the operation.

Treatment choices

A very short distal narrowing may be treated with a carefully selected meatoplasty. Longer fossa disease usually needs augmentation with a graft, commonly oral mucosa. When local tissues are severely scarred or there is failed hypospadias, staged reconstruction may be required.

Why repeated endoscopic cutting is usually disappointing

The distal urethra is sensitive to further scarring and the penile urethra is not a good site for repeated VIU. Durable reconstruction is often preferable when disease is recurrent or extends beyond a minimal meatal ring.

Distal urethral reconstruction is also about the glans

The fossa navicularis lies within the glans, so surgery has to create space for the urethra without leaving a deformed or excessively scarred glans. Previous hypospadias repair, lichen sclerosus and repeated meatotomy can reduce the amount of healthy glanular tissue available.

Some distal repairs open the glans and augment the urethral plate with oral mucosa; others use glans-preserving approaches when anatomy permits. The surgeon also decides where the final meatus will sit and how to minimise spraying. These details explain why a distal 2-cm stricture can require more nuanced planning than a similar-length bulbar stricture.

After reconstruction, early spraying can occur while swelling settles and is not automatically failure. Persistent narrowing, wound separation or a new fistula should be reviewed.

When should you see a urologist?

The fossa navicularis is the short distal segment just inside the glans. A stricture here can look like ‘meatal narrowing’ to a patient, but reconstruction is different when the scar extends beyond the opening.

• The stream sprays despite the meatus not looking extremely small.
• Instrumentation repeatedly catches just inside the glans.
• There is a history of lichen sclerosus, catheterisation or transurethral surgery.
• Previous meatotomy helped only temporarily.
• The glans has scarring, splitting or prior hypospadias surgery.

How distal anatomy changes the operation

The fossa navicularis lies inside the glans, so reconstruction must restore both a usable channel and a reasonable meatal shape. A simple incision may be enough for a very short meatal narrowing, but a longer fossa scar can require a graft or flap placed within limited glanular tissue.

The surgeon also checks whether disease extends proximally into the penile urethra. Treating only the visible meatus when several centimetres are scarred may give brief relief but leave the real obstruction behind. RGU and cystoscopy can help define that proximal extent.

In lichen sclerosus, local skin quality is especially important. Diseased genital skin should not be used as the reconstructive substitute; oral mucosa is commonly preferred. In previously operated hypospadias, available glans and dartos tissue may be limited, which can make staged reconstruction more appropriate.

How is urethral stricture diagnosed?

Examination determines the meatal appearance and quality of glans tissue, but the surgeon must also know how far the scar extends proximally. Gentle distal calibration/cystoscopy and RGU can separate isolated meatal disease from a longer fossa-navicularis or penile stricture. Lichen sclerosus changes and previous hypospadias scars are specifically documented because they affect tissue choice.

Treatment options

Distal reconstruction must balance patency, stream direction and glans cosmesis. Simply making a wide external opening can solve obstruction but may not meet every patient’s functional or cosmetic goals.

Dilatation or VIU / DVIU

Repeated dilatation has limited durability for a fixed distal scar, and DVIU is not recommended for penile strictures. Temporary calibration may occasionally be used while a definitive plan is being made.

Urethroplasty

Options include meatoplasty for very distal disease and graft/flap-based distal urethroplasty when the fossa navicularis is involved. Oral mucosa is commonly used when genital skin is diseased or lichen sclerosus is present. The exact glans incision/reconstruction is tailored to scar pattern and tissue quality.

Urinary drainage when the patient cannot pass urine

If urgent drainage cannot be achieved atraumatically through the distal urethra, suprapubic catheterisation can protect the reconstruction field.

What to bring for consultation

• Previous meatal/fossa-navicularis procedure records.
• Any lichen-sclerosus diagnosis or dermatology treatment.
• RGU if proximal extension is suspected.
• History of hypospadias or glans surgery.
• Uroflow/PVR when there are broader obstructive symptoms.
• Your priority regarding stream direction, standing voiding and glans appearance.

FAQs

Related reading

• Meatal Stenosis in Men: Symptoms and Treatment
• Penile Urethral Stricture Explained
• Lichen Sclerosus and Urethral Stricture
• Buccal Mucosal Graft Urethroplasty
• Urologist in Latur

References

• European Association of Urology. EAU Guidelines on Urethral Strictures, 2026 https://uroweb.org/guidelines/urethral-strictures
• European Association of Urology. EAU Guidelines on Urethral Strictures: Diagnostic Evaluation, 2026 https://uroweb.org/guidelines/urethral-strictures/chapter/diagnostic-evaluation
• European Association of Urology. EAU Guidelines on Urethral Strictures: Disease Management in Males, 2026 https://uroweb.org/guidelines/urethral-strictures/chapter/disease-management-in-males
• American Urological Association. Urethral Stricture Guideline (2023 amendment) https://www.auanet.org/guidelines-and-quality/guidelines/urethral-stricture-guideline