“…It was first observed in the lung and described by Brunn in 1939 [3,4]. Its synonyms include "xanthogranuloma," "fibrous xanthoma," "plasma cell granuloma," "histiocytoma," "pseu-dolymphoma," "plasmacytoma" and "inflammatory fibrosarcoma" [2,[4][5][6][7][8]. Some investigators believe that it is a true neoplasm, while others believe that it represents an immunological response to an infectious or noninfectious agent [4,7,[9][10][11].…”