We describe a patient who presented with a history of unexplained exer
tional dyspnea and pulmonary infiltrates. She was evaluated for inters
titial lung disease, presumed to be idiopathic and underwent an open l
ung biopsy. The pathologic findings were compatible with exogenous lip
oid pneumonia and her history revealed longstanding use of intranasal
petroleum jelly (Vaseline) at bedtime. (Chest 1994; 105: 968-69)