This sign refers to a small isolated aggregation of gas situated anterior to the upper hepatic surface. It is the most frequent, therefore the most important, among the various right upper quadrant gas signs.5,6,15,17 The anterior superior bubble may be single or multiple, with the gas describing an oval or circular shadow, ranging from a few millimeters to several centimeters in diameter
There is diffuse lucency over the liver with a straight lateral border (arrowheads) from a large pneumoperitoneum.
(Figs. 7-25, 7-28, 7-29, 7-33 through 7-35). It often appears in the medial half of the right upper quadrant, but small deposits of free air may be positioned more laterally. Its location varies depending on the shape and size of the liver in relation to the contour of the anterior abdominal wall. Occasionally, an abscess in and near the liver, bowel gas, and an atelectatic streak of lung projecting under the dome of the diaphragm can closely simulate the anterior superior bubble.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.