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[Rounded atelectasis with emphasis on its wide spectrum]

K Hayashi¹, S Kohzaki, M Uetani

¹Department of Radiology, Nagasaki University School of Medicine.

Nihon Igaku Hoshasen Gakkai Zasshi. Nippon Acta Radiologica

|September 25, 1993

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Rounded atelectasis (RA) is a common condition with varied appearances. This study defines RA and proposes it as a spectrum of disease, challenging previous narrow definitions.

Area of Science:

Radiology
Pulmonology

Background:

Rounded atelectasis (RA) is frequently reported in Western countries but rarely in Japan.
The radiographic presentation of RA exhibits significant variability.
A clear, universally accepted definition of RA is lacking.

Observation:

A retrospective review of 22 cases identified as RA and its variants was conducted.
RA was defined as peripheral atelectasis with lung distortion, mimicking a tumor.
Typical diagnostic criteria include peripheral tumoral shadow, acute pleural angle, vessel convergence, and volume loss.

Findings:

The study identified cases lacking some typical RA criteria but still considered within its broad category.
A wide spectrum of RA presentations exists, from typical "cranial tilting" to linear pleural-based shadows.

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This variability suggests RA is a spectrum entity rather than a single entity.

Implications:

The findings necessitate a broader understanding of RA beyond typical presentations.
This research may improve diagnostic accuracy and reduce misdiagnosis of RA as malignancy.
Further research is warranted to fully elucidate the spectrum of rounded atelectasis.