Michael P. D'Alessandro, M.D.
Peer Review Status: Internally Peer Reviewed
Due to birth trauma, perinatal stress associated with anoxia or dehydration, and systemic disorders such as thrombocytopenia, septicemia, and congenital syphilis. Seventy percent involves the right adrenal while 5-10% are bilateral. Usually has spontaneous resolution in 4-6 weeks.
Initially on ultrasound it will appear as an anechoic suprarenal mass with variable compression and displacement of the kidney. Rarely the hematoma will appear as echogenic and complex and is difficult to distinguish from neonatal neuroblastoma. Repeating the ultrasound in a month allows the two to be distinguished as by then neonatal hemorrhage should have either turned cystic in appearance or resorbed.
Two weeks after hemorrhage calcification can develop on the abdominal plain film.
See References Chapter.
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