“Air bubble”: a new diagnostic CT sign of perforated pulmonary hydatid cyst |
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Authors: | O Köktürk C Öztürk B Diren M Ünsal K Ayla |
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Institution: | (1) Department of Chest Diseases, Gazi University School of Medicine, Ankara, Turkey, TR;(2) Department of Radiology, MedArt Medical Center, Ankara, Turkey, TR;(3) Atatürk Chest Diseases and Chest Surgery Center, Ankara, Turkey, TR |
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Abstract: | The greatest difficulty in the CT diagnosis of perforated pulmonary hydatid cyst (PPHC) is the increase in the attenuation
numbers following infection. Because of the solid density of infected hydatid cysts, the differentiation from an abscess or
neoplasm is usually impossible. The aim of this study was to evaluate the value of “air bubble” as a new CT sign in the diagnosis
of PPHC. Sixty-five patients (28 men and 37 women) with PPHC were included in the study. As a control group, 55 patients who
had malignant (n = 36) or non-malignant (n = 19) pulmonary diseases were also examined. Radiological diagnosis with classical CT findings was made in only 38 of 65
patients (58.5 %) with PPHC. Air bubble sign was positive in 54 of the patients with PPHC (sensitivity 83.1 %) but only 3
of 55 patients in control group (specificity 94.5 %). When we analyzed the CT scans with classical CT findings including air
bubble, the diagnosis of PPHC was made in 61 of patients (93.8 %). It is concluded that “air bubble sign” is a valuable CT
finding in the diagnosis of PPHC.
Received: 3 September 1997; Revision received: 22 May 1998; Accepted: 5 August 1998 |
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Keywords: | : Hydatid disease Chest CT |
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