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(A) Cross section of lung specimen with peribronchiolar fibrosis inducing bronchial enlargement. Tumorlet (t) adjacent to bronchus (b) and vascular (v) tissue; (B) High power magnification of tumorlets with neuroendocrine growth pattern, cells are uniform, round with stippled chromatin (yellow arrow); (C) NEH with epithelial proliferation and tumorlets immunopositive for synaptophysin.
