“…The term 'plasma cell granuloma' has been used for a number of pulmonary lesions, all characterized by the presence of plasma cells, histiocytes, ly~nphocytes, blood vessels and other components of an inflammatory reaction (Bahadori & Liebow 1973). The similarity to granulation tissue has led some to consider this entity as an inflammatory pseudotumour (Umiker & Iverson 1954, Titus et al 1962, Val-Bernal, Garijo-Ayensa & Echevarri 1973, Vila-Torres et al 1976, and the predominance in some lesions of the histiocytic infiltrate and abundant foam cells, has justified the use of terms like xanthoma, fibroxantlioma or histiocytoina (Scott, Morrow & Payne 1948, Umiker & Iverson 1954, Viguera et al 1976, Spencer 1977.…”