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Endosonography with an echoendoscope (12 MHz frequency is used) placed in the gastric lumen (gl) showing the layers of the gastric wall (gw) and GI loops outside the stomach. Lumen is partly collapsed (d), partly waterfilled (arrows). Motility and contractions of native GI loops may be studied. High frequency miniprobes are less suitable for this purpose due to higher frequencies and small transducer diameter.
