Introduction
Aspergillosis of the paranasal sinuses (PSA) is a well known entity, which usually occurs in the maxillary sinus. Frontal sinus is rarely involved, and usually represents the progression of a mycotic infection within other sinuses. However, isolated involvement of frontal sinus even though extremely rare, has been reported, but its pathogenesis poorly understood [1]. Computed tomography (CT) and/or magnetic resonance (MR) imaging are the gold standard in the diagnostic process. Radiological aspect of frontal sinus aspergilloma (FSA) is similar to other PSA, except for a high incidence of erosive non-invasive forms [1].
The aim of this study was to report our cases and identify key features and aspects suggestive of FSA, to enable clinicians to appropriate diagnosis; moreover, we have investigated the pathogenesis of this entity which has not been clearly elucidated yet.