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.