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Acetabular pneumatocyst containing air-fluid level.

J A Narváez1, J Narváez, M Rodríguez-Mijarro

  • 1Department 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.

European Radiology
|October 20, 1999
PubMed
Summary

This study reports the first case of an acetabular pneumatocyst with an air-fluid level in a patient with ankylosing spondylitis. This finding expands understanding of intraosseous gas manifestations in joint disease.

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Area of Science:

  • Radiology
  • Orthopedic Surgery
  • Rheumatology

Background:

  • Intraosseous gas is typically associated with osteomyelitis, vacuum phenomenon, or post-surgical/traumatic conditions.
  • Subchondral gas-filled lesions, termed pneumatocysts, have been documented in the sacroiliac joint and clavicle, but without intralesional air-fluid levels.
  • The etiology of these pneumatocysts remains uncertain, and they are generally considered benign.

Observation:

  • A unique case of an acetabular pneumatocyst containing an air-fluid level is presented.
  • The patient was a 62-year-old male with a history of long-standing ankylosing spondylitis affecting the hip joint.

Findings:

  • This represents the first documented instance of a pneumatocyst in the acetabulum exhibiting an air-fluid level.

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  • The presence of an air-fluid level within the acetabular pneumatocyst is a novel radiological finding.

    • Implications:

    • This case expands the spectrum of known intraosseous gas presentations, particularly in the context of chronic arthropathies like ankylosing spondylitis.
    • Further investigation may elucidate the specific mechanisms leading to air-fluid level formation in these lesions.
    • Radiologists and clinicians should consider this presentation when evaluating hip joint abnormalities in patients with spondyloarthropathies.