• Progressive interstitial fibrosis with roentgenographic honeycombing developed in the case of a psoriatic patient who had been on a regimen of methotrexate for 18 years. Examination revealed a combined restrictive and obstructive defect in pulmonary mechanics and severe compromise of gas transfer across the pulmonary alveolar-capillary membrane. Improvement in the level of arterial blood gases and pulmonary diffusing capacity occurred after discontinuation of methotrexate therapy. Interstitial fibrosis of the lung is a potential complication of methotrexate therapy for psoriasis.
(Arch Dermatol 114:1800-1802, 1978)
Kaplan RL, Waite DH. Progressive Interstitial Lung Disease From Prolonged Methotrexate Therapy. Arch Dermatol. 1978;114(12):1800–1802. doi:10.1001/archderm.1978.01640240042014
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