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This video of a normal left upper quadrant clearly shows all four of the spaces visible in this window. The pleural space has no fluid, as is demonstrated by the mirror artifact in the bottom left corner of the screen, showing a reflection of the spleen on the other side of the diaphragm. The border between spleen and kidney is similarly without anechoic fluid. The inferior pole of the kidney and spleen are completely visualized, and are clear. The subdiaphragmatic space is similarly a tight border between spleen and diaphragm without anechoic space.