Max and Kevin discuss the pathology encountered in e-cigarette or vaping product associated acute lung injury (EVALI). In the pattern based approach, you can get to the diagnosis of inhalation acute lung injury through the acute lung injury path (Pattern 1) or the nodules path (Pattern 5). The final diagnosis requires clinicopathologic correlation. Oil Red O stains are NOT useful in the workup of lung biopsies in this setting as they lack specificity, have unknown sensitivity, and are technically unreliable.

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