Inflammatory pseudotumours or plasma cell granulomas are space-occupying, rounded masses appearing in various locations usually as an aftermath of recurrent infections.
Recurrent pain and mass have been the most common presentations (Durst et al., 1977). These have been confused with tumours but radical surgical treatment is unnecessary, in the absence of life-threatening complications. The prognosis is excellent after excision. The nature and pathogenesis of the inflammatory pseudotumours, their presentation as fever and anaemia in some cases, are unknown.
This report is probably the first case of a plasma cell granuloma involving the maxillary sinus causing focal erosion of the orbital wall, simulating a malignant tumour clinically.