Snapshot A 56-year-old man presents to his physician for pain in his right calf. He noticed his calf appears red and denies any trauma to the affected area. A week prior to presentation, he was flying on a plane for 14 hours. Medical history is significant for venous insufficiency. On physical exam, there is erythema on the posterior calf and tenderness along the course of a superficial vein. A duplex ultrasound demonstrates impaired blood flow and incompressibility of a superficial vein. Introduction Clinical definition login to view 1 more bullet Associated conditions login to view 3 more bullets Prognosis login to view 1 more bullet Epidemiology Demographics login to view 2 more bullets Location login to view 2 more bullets Risk factors login to view 7 more bullets ETIOLOGY Pathogenesis login to view 1 more bullet Presentation Symptoms login to view 1 more bullet Physical exam login to view 5 more bullets Imaging Duplex ultrasound login to view 6 more bullets Studies Labs login to view 1 more bullet Differential Deep venous thrombosis login to view 2 more bullets Septic thrombophlebitis login to view 5 more bullets DIAGNOSIS Making the diagnosis login to view 1 more bullet Treatment Conservative login to view 3 more bullets Medical login to view 9 more bullets Complications Progression to deep venous system login to view 2 more bullets