Invasive aspergillosis or mucormycosis of the paranasal sinuses involving the cranial cavity is termed rhinocerebral mycosis, which is often difficult to differentiate from malignancy. Prognosis of rhinocerebrla mycosis is disatrous and usually fatal . The authors herien report 6 cases of rhinocerebral mycosis : two of them were mucormycosis and four were aspiergillosis histopathologically. Main CT features are modular mucosal thickening in the multiple sites of the paranasal sinuses that extend to orbital apex or cavernous sinus through focal destruction of bony wall. In spite of their invasiveness beyond bony boundary, destruction is not so remarkable and it is not so remarkable and it is always accompanied by bony sclerosis. Awareness of these diseases and CT patterns discussed in this report should be helpful in leading to early biopsy and treatment.