Radiographic, sonographic, and histologic findings in a case of a huge splenic cyst in a newborn are presented. The patient had the characteristic findings, particularly the visceral displacement, associated with splenic cysts in a series of 10 older children and adolescents. The occurrence in a newborn of a large splenic cyst histologically similar to those found in older children supports the hypothesis that they are developmental rather than traumatically acquired.
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