Six month old male with history of hydronephrosis on outside ultrasound. KIDNEYS  Cortical Echogenicity: Normal on right, left kidney not visualized.  Medullary Echogenicity: Normal on right, left kidney not visualized.  Pelvicaliceal System -- SFU Grade*  Right: 0 Left: Not visualized  Length*** Right: 6.2 cm Left: Not visualized  Mean for age: 6 cm  Range for age: 4.5 - 7.5 cmADDITIONAL OBSERVATIONS: Patient family reports left kidney was seen in a low position on ultrasound from Kuwait when patient was one month of age. Now, no left kidney is visualized in any of the 4 abdominal quadrants or pelvis.
Normal solitary right kidney. Nonvisualized left kidney likely secondary to involution of a multicystic dysplastic kidney.*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 calyces 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