Fig. 2From: Dental technician pneumoconiosis mimicking pulmonary tuberculosis: a case reporta and b CT guided lung biopsy. Haematoxylin and eosin stain revealed absence of normal alveolar tissue, which were replaced by fibrous tissue. There were areas of histiocytes proliferation with the presence of refractile dental material (blue arrow). The fibrous tissue was lined by ciliated tall columnar respiratory epithelium (black arrow)Back to article page