Rheumatoid Pseudocyst (geodes) of Anterior Inferior Iliac Spine: A Case Report

Typically, geodes are associated with obvious joint involvement, and they are located in the subchondral portion of the joint. Radiological lucencies are produced by pannus infiltration through a disruption in the subchondral plate, and they present as round or oval cystic areas of various sizes. We report a patient with rheumatoid disease and positive antinuclear antibody who had a geode that did not involve the joint. Considering the mechanism of geode occurrence, this is a very rare report of such a manifestation. As a result, we present a rare case of geode occurrence without joint involvement in the setting of rheumatoid disease.