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Fig. 1D —CT-guided core biopsy in 60-year-old woman with pure ground-glass
opacity (GGO) lesion in right upper lobe. Photomicrograph reveals that
alveolar walls are lined by cellular proliferation of atypical pneumocytes
with hobnail morphology. No evidence of stromal invasion is seen. Histologic
diagnosis of core biopsy was bronchoalveolar carcinoma. Final diagnosis after
surgical resection was bronchoalveolar carcinoma, Noguchi type A. (H and E,
x200)
