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AJR 2000; 174:37-41
© American Roentgen Ray Society

Mycoplasma pneumoniae Pneumonia

Radiographic and High-Resolution CT Features in 28 Patients

Pia Reittner1, Nestor L. Müller1, Laura Heyneman1, Takeshi Johkoh1,2, Jai Soung Park3, Kyung Soo Lee4, Osamu Honda2 and Noriyuki Tomiyama2

1 Department of Radiology, Vancouver Hospital and Health Sciences Centre, 855 W. 12th Ave., Vancouver, B.C., V5Z IM9 Canada.
2 Department of Radiology, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka 565-0825, Japan.
3 Department of Radiology, College of Medicine, Soonchunhyang University, Seoul 140-210, Korea.
4 Department of Radiology, Samsung Medical Center, College of Medicine, Sungkyunkwan University, 50 Irwon-dong, Kangnam-ku, Seoul, 135-710 Korea.

OBJECTIVE. The aim of the study was to compare the radiographic and the high-resolution CT findings of Mycoplasma pneumoniae pneumonia.

MATERIALS AND METHODS. The chest radiographs and 1.5-mm collimation CT scans obtained in 28 patients with serologically proven M. pneumoniae pneumonia were retrospectively reviewed. The radiographs and CT scans were analyzed independently by two observers.

RESULTS. The most common finding on radiography was the presence of air-space opacification (n = 24), which was patchy and segmental (n = 9) or nonsegmental (n = 15) in distribution. On high-resolution CT, areas of ground-glass attenuation were seen in 24 patients (86%) and air-space consolidation in 22 (79%). In 13 patients (59%), the areas of consolidation had a lobular distribution evident on CT. Nodules were seen more commonly on high-resolution CT (25 of 28 patients, 89%) than on radiography (14 patients, 50%) (p << 0.01, chi-square test). In 24 (86%) of the 28 patients, the nodules had a predominantly centrilobular distribution on CT. Thickening of the bronchovascular bundles was identified more commonly on CT (23 of 28 patients, 82%) than on radiography (five patients, 18%) (p << 0.01, chi-square test).

CONCLUSION. The lobular distribution, centrilobular involvement, and interstitial abnormalities in M. pneumoniae pneumonia are often difficult to recognize on radiography but can usually be seen on high-resolution CT.


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