Pyonephrosis with large renal calculus on POCUS Acute left flank pain with nausea and vomiting. What's the diagnosis? Answer: Pyonephrosis from large renal calculus. Note moderate hydronephrosis with layering debris. Tx with perc neph to drain infected urine and IV abx. - MH_EMUltrasound @MH_EMultrasound #Pyonephrosis #calculus #renal #ultrasound #clinical #hydronephrosis #kidney