Multifocal neuroendocrine cell hyperplasia accompanied by tumorlet formation and pulmonary sclerosing pneumocytoma: A case report

Figure 3 Pathological findings. A: Microscopic examination showed inflammatory cell infiltration with lymphocytes, neutrophils, and histiocytes in alveoli. Alveolar septa broke and merged, focal bronchiectasis was observed, and cartilage in the bronchus was damaged [(hematoxylin and eosin staining (HE staining), × 40]; B: Multifocal neuroendocrine-like cell nest hyperplasia was found in the surroundings of the expanded bronchus (single focal diameter < 0.5 cm; HE staining, × 100); C: The nuclei of hyperplasia cells are polygonal or short fusiform with a uniform size. The nuclear chromatin was delicate and in fine particles. The nucleoli were unclear; no mitotic figures or necrosis was detected (HE staining, × 200); D: HE staining (× 100) showed the papillary arrangement of tumor cells and a sample of vascular cavity.