Eight hours old male with left renal pelvis measuring 7.5 mm on prenatal ultrasound. Evaluate for structural abnormalities. KIDNEYS  Cortical Echogenicity: Normal   Medullary Echogenicity: Normal   Pelvicaliceal System -- SFU Grade*  Right: 0 Left: 0  Length*** Right: 4.1 cm Left: 4.3 cm   Mean for age: 5.0 cm  Range for age: 4.0 - 6.0 cmADDITIONAL OBSERVATIONS: Please note that ultrasound can underestimate the degree of hydronephrosis in a newborn due to dehydration.
Normal examination. Please note ultrasound can underestimate the degree of hydronephrosis in a newborn due to dehydration. Recommend follow up ultrasound in one week for definitive evaluation.*SFU grading system: Grade 0: No hydronephrosis. Grade 1: The renal pelvis is visualized. Grade 2: A few but not all of the calices are identified in addition to the renal pelvis. Grade 3: Virtually all the calices are seen. Grade 4: Grade 3 and parenchymal thinning.Fernbach SK, Maizels M, Conway JJ. Ultrasound Grading of Hydronephrosis: Introduction to the System used by the Society for Fetal Urology. Pediatric Radiology (1993) 23: 478-480.***Rosenbaum DM, Korngold E, Teele RL. Sonographic Assessment of Renal Length in Normal Children. AJR Am J. Roentgenol (1984) 142:467-469