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Related Experiment Video

Updated: Feb 5, 2026

Taste Exam: A Brief and Validated Test

Taste Exam: A Brief and Validated Test

Published on: August 17, 2018

A lung pattern you can almost taste.

Christopher Castaneda¹, Ryan Johnson², Kris Conde²

¹Philadelphia College of Osteopathic Medicine, United States of America.

Clinical Imaging

|February 3, 2026

Summary

This summary is machine-generated.

The headcheese sign on CT scans indicates hypersensitivity pneumonitis. This radiological sign, also known as the three density sign, shows a mix of normal lung, ground glass opacities, and air trapping.

Keywords:

Chest CT Headcheese Hypersensitivity pneumonitis I saw the sign Lungs

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Related Experiment Videos

Last Updated: Feb 5, 2026

Taste Exam: A Brief and Validated Test

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Published on: August 17, 2018

Generation and Culture of Lingual Organoids Derived from Adult Mouse Taste Stem Cells

Generation and Culture of Lingual Organoids Derived from Adult Mouse Taste Stem Cells

Published on: April 5, 2021

Technique to Collect Fungiform Taste Papillae from Human Tongue

Technique to Collect Fungiform Taste Papillae from Human Tongue

Published on: September 18, 2010

Area of Science:

Radiology
Pulmonology
Medical Imaging

Background:

The headcheese sign is a specific radiological finding on computed tomography (CT) scans.
It is classically associated with hypersensitivity pneumonitis, an immune system disorder affecting the lungs.
The sign's appearance is derived from the visual resemblance to the meat dish, headcheese.

Purpose of the Study:

To describe the radiological characteristics of the headcheese sign.
To highlight its association with hypersensitivity pneumonitis.
To explain the underlying pathophysiology leading to this imaging pattern.

Main Methods:

Review of CT imaging findings in patients diagnosed with hypersensitivity pneumonitis.
Correlation of imaging features with clinical and pathological data.
Analysis of the components contributing to the "three density sign".

Main Results:

The headcheese sign is characterized by a mosaic pattern on CT.
This pattern results from the simultaneous presence of three distinct lung attenuations: ground glass opacities, air trapping, and normal lung parenchyma.
This combination of densities creates the characteristic appearance described as the headcheese sign.

Conclusions:

The headcheese sign is a valuable CT finding for diagnosing hypersensitivity pneumonitis.
It represents a specific manifestation of mixed lung pathologies, including inflammation and air trapping.
Recognition of this sign aids in the early identification and management of hypersensitivity pneumonitis.