Abstract
BACKGROUND: Fungal infections of the paranasal sinus are increasingly recognized in both normal and immunocompromised individuals. It is necessary to distinguish invasive diseases from the non- invasive as the result and prognosis of sinus treatment different in each one. CBCT imaging could help us in this regard. In this case, we describe a fungal sinusitis according to Cone Beam Computed Tomography (CBCT) findings. CASE PRESENTATION: We present a case of a 48-year-old woman with diabetes mellitus referred to our Maxillofacial Radiology Center in Babol, Iran. The patient has been discharged from the hospital recently after recovering from COVID-19 Considering the background systemic disease (diabetes) and clinical and radiological findings (extension of bone destruction), fungal sinusitis (invasive form) was listed top in the differential diagnosis list , as it is the most common condition in post-COVID-19 patients. CONCLUSION: CBCT images are very useful for diagnosing normal anatomy variations and sinus lesions especially bone lesions .In this case, its early diagnosis led to rapid recovery of the patient.