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Fig. 5B. —Acute and chronic venous thrombosis in 64-year-old man with small cell lung carcinoma. Longitudinal sonogram using color Doppler of proximal right thigh shows recanalized small superficial femoral vein (arrowheads) and capacious profunda vein shown in black and white (arrow) with normal flow. Valvular incompetence indicated by reversed flow on spectral waveform during Valsalva's maneuver was also noted (not shown).