Radiology signs serve as a pathognomonic for determining specific diagnoses or narrowing differential diagnoses based on imaging alone. Many signs resemble astronomical entities. These "astronomical signs" are distinctive and include "out of this world" phenomena, such as, the stars, planets, and comets. Knowing these classical findings are important as a memory aid for clinicians and radiologists to recognize a radiological appearance related to certain conditions.
Educational Goals / Teaching Points
Illustrate classic radiology signs of several pathological conditions that correlate with radiologic manifestations that resemble various types of astronomical features. Through case-based scenarios, we highlight key findings to allow radiologists to make a confident diagnosis on the basis of imaging findings alone.
Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
Ultrasound signs include comet tail artifact, starry sky, and twinkling Artifact. CT signs include comet tail and galaxy. Plain Radiograph findings include Earth-heart sign. loss of half-moon overlap sign, and sunburst appearance. MRI findings include -starfield pattern, starry sky, and sunburst sign.
There are many astronomical classic radiologic signs that the trained radiologist should recognize, thereby allowing confident diagnosis on the basis of imaging findings alone or narrowing differential diagnoses.