Abstract
The pronator quadratus muscle is a small quadrilateral muscle attached to the anterior aspects of the distal sixths of the radius and ulna. A well-defined fascia covers the muscle, preventing intermuscular communication and creating a distinct forearm space in which fluid can accumulate (4). A thin layer of fat overlies the fascial covering, between the pronator quadratus and flexor digitorum profundus muscles (1,4). This fat plane can be seen as a thin radiolucency on at least 90% of lateral radiographs of normal distal forearms (1,3). The thin radiolucency can either have a slight anterior convexity or be straight and parallel to the ra-
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