Isolated congenital megacystis with spontaneous resolution: a case report

Abstract

The patient was a male infant with an antenatal diagnosis of huge intraabdominal mass. Prenatal ultrasound at 35 weeks gestation revealed a markedly enlarged cystic mass in the lower abdomen. After birth at 38 weeks, the infant was allowed to void spontaneously and passed meconium. Ultrasonography showed an enlarged bladder with wall thickness of 2.9 mm and no hydronephrosis. Voiding cystourethrograms showed no evidence of vesicoureteral reflex and posterior urethral valve. The post -void residuals were 15 mL at 11 days of life, 5 mL at 1 month and 0 mL at 5 months. Over 10 years' follow -up, the patient remains completely well without any urinary or gastrointestinal symptoms. In sporadic isolated congenital megacystis, which is not so rare in fetuses but is quite rare in neonates, gastrointestinal symptoms may be masked in the neonatal period ; however, the present patient has never presented any symptoms.

A Late Preterm Female Infant with Fetal Growth Retardation in Whom Changes in Autonomic Balance Were Likely Involved in Bradycardia and Residual Urine Retention

“…Congenital megacystis is easy to diagnose with fetal screening thanks to the easy availability of ultrasonography. We recently reported a very rare case of transient solitary megacystis [3]. Due to intrauterine growth retardation, the reported infant underwent multiple fetal screening echoes at both the referral hospital and our hospital.…”

“…However, newborn babies urinate more frequently than adults, which is thought to compensate for the amount of urine produced [1,2]. We recently reported a male infant with transient isolated congenital megacystis that was identified by fetal echo as a mass lesion in the pelvic cavity and which caused a large amount of residual urine over a limited period of time after birth [3]. Here, we experienced a late preterm infant with Fetal Growth Retardation (FGR) who had no abdominal abnormalities on fetal echo and megacystis early in life, the cause of which was found to be transient and marked amounts of residual urine.…”