Figure 1

Imaging and histology of the nodule. Chest X-ray (A) and CT scan (B&C) showed a 25×33 mm nodule in the right upper lung. Diffused small nodules throughout the lung can be seen in the chest-X ray. HE (hematoxylin and eosin) staining (D) of the biopsied 25×33 nodule showed fibrous tissue hyperplasia and hyaline change. Carbon deposits and chronic inflammatory cell infiltration could be seen. Immunostaining (E) of CD163 and CK (criatinne kinase) showed positive CD163 staining and negative CK staining.