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Chest Imaging

E2932. Signs in Chest Imaging: Name Saves Time and Helps You Remember

Ojili V1,  Nepal P2,  Kaur N.1 1. UT Health San Antonio, San Antonio, Texas; 2. Metropolitan Health Center, New York, New York

Address correspondence to V. Ojili (

Background Information: Radiological signs are recognizable, characteristic patterns used to describe abnormalities visualized on various imaging modalities. Awareness of such signs can shorten the differential diagnosis list and ultimately aid in the diagnosis and subsequent treatment of disease. The purpose of this exhibit is to provide an educational review for the radiology residents, whether they are beginning their training or preparing for the certification examinations, and serve as a refresher and reference to the practicing radiologist.

Educational Goals/Teaching Points: We describe the plain radiographic and CT signs in chest imaging and discuss the clinical manifestations of specific imaging findings, highlight the usefulness of the classic imaging signs, and discuss how they can aid in the differential diagnosis and management.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques: Radiological practice includes classification of illnesses with similar characteristics through recognizable signs. These signs can aid the physician to reach a diagnosis and facilitate management. In this exhibit we present the frequently encountered as well as the rare but useful plain film and CT signs in chest imaging including the air bronchogram sign, silhouette sign, deep sulcus sign, continuous diaphragm sign, bulging fissure sign, Luftsichel sign, Golden S sign, air crescent sign, halo sign, reverse halo sign, water-lily sign, etc. Plain radiographs and CT are very useful in the detection of these signs and are well suited for reliable depiction of the underlying cause and associated complications.

Conclusion: Knowledge of various imaging signs in chest imaging and the ability to recognize these signs can help the radiologist in shortening the differential diagnosis list and ultimately aid in the diagnosis and facilitates appropriate management.