Renal vein thrombosis in a child, a rare case with an unusual finding on nuclear renal scan

We present a case of unusual finding on nuclear renal scan in a child of 9 years. Latter on that was diagnosed as a case of renal vein thrombosis. The child presented in pediatric outpatient department (OPD) with complaint of intermittent abdominal pain. On abdominal ultrasound there were asymmetrical kidneys in size. On nuclear scan there was peripheral rim sign/doughnut sign not mentioned or explained in literature previously that was reported as suspicious for renal vascular insult. Renal vein thrombosis was confirmed on renal Doppler ultrasound. Patient recovered completely with medical treatment in pediatric nephrology department without surgical intervention.