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Updated: Jun 4, 2026

Is My Mouse Pregnant? High-Frequency Ultrasound Assessment
Published on: March 18, 2021
[A baby with an abdomen full of balls]
Nicolette D Moes1, Harma A Koetse
1Beatrix Kinderziekenhuis, Universitair Medisch Centrum Groningen, afd. Kindergeneeskunde, The Netherlands.
Insights
Calcified meconium balls in a newborn indicate an urethrorectal fistula. This rare condition, associated with anorectal malformations, occurs when urine enters the intestinal tract, causing calcification.
Area of Science:
- Pediatric Surgery
- Neonatal Imaging
- Congenital Malformations
Background:
- Anorectal septum malformation is a rare congenital anomaly.
- Urethrorectal fistulas can occur as part of these malformations.
- Meconium is the first stool passed by a newborn.
Observation:
- Radiologic examination of a 2-day-old female infant revealed intra-abdominal densities within the colon.
- These densities were identified as calcified meconium balls.
Findings:
- The calcification of meconium was attributed to the presence of urine within the intestinal tract.
- This finding confirmed the diagnosis of an urethrorectal fistula.
Implications:
- Calcified meconium balls serve as a radiologic marker for urethrorectal fistulas in neonates.
- Early identification of this condition is crucial for timely surgical intervention.
- This case highlights the importance of considering urinary tract anomalies in infants with anorectal malformations.
Abstract:
A 2-day-old girl with an urethrorectal fistula as part of an anorectal septum malformation showed intra-abdominal densities in the colon on radiologic examination, due to calcified meconium balls. This calcification is caused by the presence of urine in the intestinal tract and therefore confirms the presence of an urethrorectal fistula.
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