Histologic changes: A stellate, cellular nodule, 3 mm in diameter, is located near a bronchiole and small pulmonary artery (upper right). Rounded nodules were also present.


An elastic van Gieson stain of the same nodule (B) shows very little dark red staining to indicate collagenous scar. Note the dark red of the collagenous adventitia of the pulmonary artery at the upper right for comparison.


Clinical summary Image 2

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