Of patients who underwent myelomeningocele closure during gestation 93.7% had significant lower urinary tract dysfunction consisting of high bladder pressure or incontinence. These data reinforce the absolute need to follow these patients closely. The potential benefits of fetal surgery in the urinary tract remain to be proved.

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Objectives To evaluate the first 100 cases of in utero myelomeningocoele (MMC) repair and urological outcomes in a prospective analysis aiming to define possible improvement in bladder function. Patients and methods We used a protocol consisting of a detailed medical history, urinary tract ultrasonography, voiding cystourethrography, and urodynamic evaluation. Patients were categorised into four groups: normal, high risk (overactive bladder with a detrusor leak‐point pressure >40 cm H2O and high filling pressures also >40 cm H2O), incontinent, and underactivity (underactive bladder with post‐void residual urine), and patients were treated accordingly. Results We evaluated 100 patients, at a mean age of 5.8 months (median 4 months), classified as high risk in 52.6%, incontinent in 27.4%, with underactive bladder in 4.2%, and only 14.7% had a normal bladder profile. Clean intermittent catheterisation was initiated in 57.3% of the patients and anticholinergics in 52.6%. Antibiotic prophylaxis was initiated in 19.1% of the patients presenting with vesico‐ureteric reflux. Conclusion The high incidence of abnormal bladder patterns suggests little benefit of in utero MMC surgery concerning the urinary tract.

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The one-step strategy is associated with 68.5% success in a single operation, whereas 31.5% will need a second repair. We recognize that meatal problems are mostly associated with fistulae and diverticula; therefore, we recommend a final acceptable proximal glandar opening that will not compromise the neourethra.

Our results show that gestational age at birth has little impact on bladder pattern. These data reinforce the need to follow this population closely.