4-month-old female patient with intermittent hypertension. Evaluate for renal vein thrombosis. KIDNEYS  Cortical Echogenicity: Normal   Medullary Echogenicity: Normal   Pelvicaliceal System -- SFU Grade*  Right: 0 Left: 0  Length*** Right: 4.9 cm Left: 4.6 cm   Mean for age: 6.2 cm  Range for age: 4.8 - 7.5 cmADDITIONAL OBSERVATIONS: The right renal vein is patent and there is Doppler color flow throughout the right kidney. The left renal vein is patent with Doppler color flow throughout the kidney. There is a trace amount of perihepatic ascites.
Patent renal veins bilaterally without evidence of hydronephrosis.*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