VIDEO 07-90. Color flow of mild pulmonic valve regurgitation originating very close to the area where the proximal left main coronary artery can be visualized. Timing the color flow with color M-mode can be useful. Pulmonic regurgitation is limited to diastole. Coronary flow occurs both in systole and in diastole. Unusually prominent coronary artery color flow can be a clue to possible left main coronary artery stenosis. In this case the flow represents pulmonic regurgitation.