We analyse the most important clinical, CT, surgical, histopathological, biological, biochemical, mycological and bacteriological features of caseous sinusitis, i.e. chronic, poorly symptomatic sinusitis which are resistant to usual treatment. CT shows an opacity of the maxillary sinus with often a hyperdense foreign body (dental overfilling) but no valid predictive criteria for fungal etiology. The endoscopic or surgical procedures point out a caseous mass often called fungal mass or aspergilloma. The biochemical composition of this mass (water, proteins, lipids) is similar to that of tissues surrounding the sinus. The calcium value is variable and shows no correlation with CT imaging. The qualitative and quantitative analysis of the metals (zinc, lead, silver, copper, iron) is of relevance for exogenic origin (dental overfilling). The fungal etiology is inconstant (20 cases) after the mycological investigations. We discuss the nosologic and diagnostic features of caseous sinusitis, fungal or not, and which are often or too often called aspergillosis sinusitis.
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