TY - CHAP M1 - Book, Section TI - Renal Masses and Urinary Ascites A1 - Weinberg, Aviva E. A1 - Kennedy, William A. A2 - Stevenson, David K. A2 - Cohen, Ronald S. A2 - Sunshine, Philip PY - 2015 T2 - Neonatology: Clinical Practice and Procedures AB - Abdominal masses are frequent in the neonate, and nearly two-thirds are renal in origin. Most are benign, representing hydronephrosis, multicystic dysplastic kidney (MCDK), polycystic kidney disease, or congenital mesoblastic nephroma. Less commonly, a flank mass may be caused by a malignant renal lesion, such as a Wilms tumor. The initial diagnosis may be made on prenatal ultrasonography (US), found in an asymptomatic infant on physical palpation, or discovered as a consequence of postnatal imaging performed for hypertension, hematuria, urinary sepsis, or difficult feeding in the new infant.1 Fetal ultrasonography may demonstrate not only the renal mass but also associated findings, such as oligohydramnios, polyhydramnios, renal cysts, hydronephrosis, and bladder wall thickness, which may aid in developing a more specific diagnosis in the antenatal period.2 Early recognition of renal masses may allow timely treatment of congenital renal anomalies that would otherwise be missed because of their asymptomatic nature. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1109798989 ER -