Infrared spectrophotometry of intraluminal meconium calculi in a neonate with imperforate anus and rectourethral fistula.

Background/purpose: Intraluminal meconium calculi are a rare cause of neonatal abdominal calcifications in patients with anorectal malformations. To investigate their pathogenesis, we performed infrared spectroscopic analysis of meconium-calcified lesions.

Methods: Meconium calculi were collected from the colostomy in a newborn patient with imperforate anus and rectourethral fistula.