head cheese sign
A descriptive term for a CT image with varying densities of lung parenchyma corresponding to a mixed infiltrative pattern consisting of ground-glass consolidation and obstructive lung disease (often associated with bronchiolitis), mosaic perfusion, with decreased
vessel calibre and side branches in hypoattenuating regions of lung parenchyma.
The appearance has been fancifully likened to hog’s head cheese (bottom image), a mixture of boiled pork scraps and pigs’ feet in a gelatinous base.
Aetiology, head cheese sign Hypersensitivity pneumonitis, sarcoidosis, atypical infections (e.g., due to Mycoplasma pneumoniae) with associated bronchiolitis, and acute interstitial pneumonia.
Synonym Hog’s head cheese sign