Radiological Features in Actinomycosis of Paranasal Sinus region and Base of Skull with Oro-antral fistula

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Actinomycosis of paranasal sinus region occurs rarely. It’ s a clinical and diagnostic dilemma associated with significant morbidity. If untreated it can spread to the base of skull and lead to fistula formation. Computed tomography scan (CT) can reveal the type and extent of disease but the definitive diagnosis is by demonstration of actinomyces on histopathology. The authors report a rare case of actinomycosis of the paranasal sinus region spreading to the base of skull with formation of oroantral fistula; CT scan findings, differential diagnosis and review of literature, has been discussed.