Anatomy, Subtypes & Symptoms of Isolated Epispadias

When a child is diagnosed with isolated epispadias, the specific anatomy—the physical way the body is formed—is the most important factor in determining the subtype and the potential for future bladder control. By understanding where the urethral opening is located and how the underlying bones are positioned, your care team can tailor a treatment plan for your child.

Male Anatomical Subtypes

In boys, isolated epispadias is classified based on where the urethral meatus (the opening where urine exits) is located along the top (dorsal) side of the penis ^[1]. Generally, the further back the opening is toward the body, the more severe the condition is considered.

• Glanular Epispadias: This is the mildest form. The opening is located on the glans (the head of the penis) ^[2].
• Penile Epispadias: The opening is located somewhere along the shaft of the penis ^[2].
• Penopubic Epispadias: This is the most complex form. The opening is at the very base of the penis, where it meets the pubic bone ^[2]. In this subtype, the defect often extends through the bladder neck (the muscular valve that holds urine in the bladder), which significantly increases the chance of urinary incontinence ^[2][3].

Female Presentation

Isolated epispadias in girls is much rarer than in boys but involves similar anatomical challenges. It is typically characterized by a “cleft” or split in the structures of the external genitalia ^[4].

• Bifid Clitoris: The clitoris is typically split into two separate halves ^[4].
• Cleft Urethra: The urethra does not form a complete tube and is instead “open” or abnormally wide along its length ^[4][5].
• Labia Minora: The small inner folds of the vulva may also be separated or underdeveloped ^[6].

The “Hidden” Variant: Concealed Epispadias

Concealed epispadias is a unique, milder form where the urethral defect is “hidden” because the prepuce (foreskin) is intact and covers the opening ^[7][8].

• Diagnosis: Because the anatomy may look normal on the outside, this variant is often diagnosed later in childhood, sometimes when a child has difficulty with potty training or during a routine exam ^[8].
• Prognosis: This type usually has a better outlook for urinary control because the bladder neck is more likely to be functioning normally ^[8][7].

Pubic Diastasis and Bladder Control

A key feature of the Bladder Exstrophy-Epispadias Complex (BEEC) is pubic diastasis—a physical separation of the pubic bones at the front of the pelvis ^[9][3].

• Pelvic Support: When these bones are separated, the muscles of the pelvic floor (the levator ani muscles) are positioned differently than they would be in a typical pelvis ^[9].
• Impact on Continence: Research shows that a wider pubic diastasis is directly linked to an increased risk of urinary incontinence ^[9]. This is because the separated bones and shifted muscles provide less support to the bladder neck, making it harder for the “valve” to stay closed and hold urine ^[9].

Diagnosis and Symptoms

Most cases of isolated epispadias are diagnosed immediately at birth during the first physical examination of the newborn ^[10].

• Signs at Birth: Doctors look for the abnormal dorsal opening, a flattened appearance of the glans, or an upward curve of the penis (called dorsal chordee) ^[11].
• Later Diagnosis: In concealed or very mild forms, symptoms may only become apparent later. These can include a spraying urinary stream, a penis that curves upward during an erection, or “continuous dampness” if the bladder neck is not holding urine properly ^[8][2].

Monitoring the Kidneys

Additionally, children with BEEC conditions may experience Vesicoureteral Reflux (VUR), where urine backs up from the bladder into the kidneys ^[2]. Doctors will frequently use routine renal ultrasounds to monitor this and ensure the upper urinary tract and kidneys remain healthy ^[2].