This has nothing to do with cheese, but represents a mish-mash of meat made from the head of a calf or pig. This variegated appearance when seen in a patient with interstitial lung disease (ILD), suggests fibrotic hypersensitivity pneumonitis as mentioned. The blue arrow points to the ground-glass, the green to the area of air-trapping and the red to a normal spared lung lobule.
Head-Cheese Sign

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The REF started in fun! In August 1996, after the Saturday radiology meeting in KEM, a few residents and Ravi and Bhavin were sitting at the “katta” having “chai”, when the usual subject of resident education came up.
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