Abnormal pulmonary interstitial morphology Anthracosis 2020-12-23T12:44:15Z Anthracosis is the deposition of black carbon pigment. It is commonly seen in perihilar lymph nodes as well as within lung parenchyma. There can be prominent storiforming (i.e., spiral patterning) of histiocytes, to such an extent as to mimic a neoplastic lesion histologically. Anthracosis is a common finding in smokers and polluted city dwellers. See Figure 15.11 in PMCID:PMC7262960.