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Here is a Quick mnemonic to remember the features of Hypersensitivity pneumonitis is:

FARMER’S LUNG 4

F – Fever and Breathing problems

A – Acute onset on exposure to grain, Moldy hay and Silage which harbor Thermophilic Actinomycetes

R – Respiratory symptoms (cough, dyspnea and Clubbing is seen too

M – Malaise starting within 4 to 8 hours of antigenic exposure

E – Elevated erythrocyte sedimentation rate and BAL shows lymphocytosis

R – Radiographic findings (ground-glass opacities, reticulonodular infiltrates)

S – Symptoms improve with removal from exposure

L – Lymphocytic alveolitis

U – Uncommon but can progress to chronic disease

N – Noncaseating granulomas

G – Granulomatous inflammation and Diagnosis is based on Clinical prediction rule

4- Type 4 hypersensitivity reaction

This mnemonic can help you recall the key features associated with Hypersensitivity pneumonitis.