CT Signs of Solitary Pulmonary Lesions: Revisited

This poster is published under an open license. Please read the disclaimer for further details.

Congress:

ECR 2015

Poster Number:

C-1764

Type:

Educational Exhibit

Keywords:

CT, Thorax, Lung, Contrast agent-intravenous, Cancer, Inflammation

Authors:

H. Hayashi, K. Ashizawa, Y. Ogihara, A. Nishida, T. Tanaka, J. Fukuoka, M. Uetani; Nagasaki/JP

DOI:

10.1594/ecr2015/C-1764

DOI-Link:

https://dx.doi.org/10.1594/ecr2015/C-1764

Fig. 1: Pneumonia. Chest radiograph shows consolidation with air bronchogram.

Fig. 2: Adenocarcinoma. Thin-section CT (TSCT) shows an “air bronchogram” running...

Fig. 3: Adenocarcinoma. Pathological microphotograh in low magnification view shows...

Fig. 5: Mucinous adenocarcinoma. Contrast-enhanced CT scan reveals CT angiogram sign.

Learning objectives

•To understand the various CT signs and key findings of solitary pulmonary lesions. •To　know the pathological findings corresponding to these signs and findings. •To understand the specific signs, combination of these signs and their limitations.

Background

There are many signs in chest CT, which we have been using in daily clinical practice. Some of them are derived from the findings in conventional chest radiography, and others are created originally based on the CT findings. These signs are useful to briefly describe the characteristics of the lesions, but it should be noted that the meaning or significance might not be the same as the original one. Contents Signs ofinternal structures air bronchogram (sign) angiogram sign CT halo sign reversed halo sign Signs...

Findings and procedure details

Signs ofinternal structures air bronchogram (sign) angiogram sign CT halo sign reversed halo sign Air bronchogram –chest radiograph- Fig. 1 Phenomenonofair-filled bronchi being made visible by the opacification of surrounding alveoli. It is almost always caused by a pathologic airspace/alveolar processes, in which something other than air fills the alveoli1. Air bronchogram on chest radiograph is an important sign to describe a feature of airspaceconsolidation, but it is rarely used for nodular lesions. Air bronchogram -CT- Fig. 2Fig. 4 Meaning of the air bronchogram on...

Conclusion

Understanding of the CT signs is important for the diagnosis and management of clinical cases. We shouldrecognize the original meaning of these signs, correlation to the pathological findings and their limitations.

Personal information

References

Fleischner FG. The visible bronchial tree; A roentogen sign in pneumonic and other pulmonary consolidations. Radiology 50; 184-189, 1948 Kuriyama K et al. Prevalence of air brohchograms in small peripheral carcinomas of the lung on thin-section CT: comparison with benign tumors. AJR 156: 921-924, 1991 Honda T et al. Radiographic and pathological analysis of small lung adenocarcinoma using the new IASLC classification. Clin Radiol 68: e21-6, 2013 Zhao F et al. CT features of focal organizing pneumonia: An analysis of consecutivehistopathologically confirmed 45 cases. EJR...