There is a suprarenal complex mass arising from the adrenal gland. The diagnosis is adrenal hemorrhage. Infants of diabetic mothers are at risk for this complication. These should be followed to resolution.
Rarely, a neuroblastoma may present in a newborn as an adrenal bleed. Wilms tumor occurs in young children, not neonates, and this is extrarenal. Similarly, this is not arising from the liver and is, therefore, not a hepatoblastoma. There is no hydronephrosis. Normal echo-poor pyramids are seen in the kidney.
REFERENCE:
Abdu AT, Kriss VM, Bada HS, Reynolds EW. Adrenal hemorrhage in a newborn. Am J Perinatol. 2009 Sep;26(8):553-7.