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Eur Radiol. 1999;9(8):1647-9.

Acetabular pneumatocyst containing air-fluid level.

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Department of CT and MR Imaging, Institut de Diagnòstic per la Imatge, Hospital Duran i Reynals, Ciudad Sanitaria y Universitaria de Bellvitge, Autovía de Castelldefels km 2'7, E-08907 L'Hospitalet de Llobregat, Barcelona, Spain.


The presence of intraosseous gas most commonly occurs in osteomyelitis, vacuum phenomenon, and postsurgery or posttraumatic states. Several cases of subchondral gas-filled lesions, called pneumatocysts, have also been described in the sacroiliac joint and clavicle, none of them with intralesional air-fluid level. These pneumatocysts are innocuous lesions of uncertain origin. We describe one case of acetabular pneumatocyst containing air-fluid level in a 62-year-old man with long-standing ankylosing spondylitis involving hip joint. To our knowledge, this is the first reported case of a pneumatocyst in an acetabular location containing air-fluid level.

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