A 3100-g Laotian male infant was found to have a barely palpable left abdominal mass during a routine postnatal examination. The patient's mother emigrated from Laos 6 weeks prior to delivery and had received no prenatal care until her arrival in this country. The pregnancy and labor were unremarkable aside from a tight nuchal cord. The infant's Apgar scores were 7 and 9 at 1 and 5 minutes, respectively. The patient fed well during the first day of life with no evidence of distress. He had a slightly distended but soft abdomen with an irregular, soft, left upper quadrant mass extending to the midline. There were no other notable abnormalities. The patient's stool was guaiac positive and the results of a urinalysis were normal. Abdominal roentgenography (Fig 1), ultrasonography, and computed tomography (Fig 2) were performed.
Denouement and Discussion