Bilateral failure of the kidneys to ascend during embryonic life may lead to fusion of the two renal masses, resulting in a round mass known as pancake kidney. Reviewing the literature, we did not encounter any reports of prenatal diagnosis of pancake kidneys. We present 6 cases of a pancake kidney diagnosed prenatally. Extrarenal associated anomalies included an aberrant right subclavian artery, nonvisualization of the uterus, consistent with Mayer-Rokitansky-Küster-Hauser syndrome, and a sequence of early-onset growth restriction, hypospadias, and syndactyly, suspected as Smith-Lemli-Opitz syndrome. On postnatal follow-up, all infants had a normal renal outcome.
Keywords: congenital anomalies of the kidney and urinary tract, Mayer-Rokitansky-Küster-Hauser syndrome; pancake kidney; prenatal diagnosis; prenatal ultrasound.
© 2020 by the American Institute of Ultrasound in Medicine.