Fig. 1
From: Primary paranasal sinus hyalinizing clear cell carcinoma: a case report
Head CT scan. Coronal head CT scan showing a destructive lesion within the paranasal sinuses extending to the nasal cavity. The epicenter of the mass is seen within the left ethmoid/posterior maxillary and sphenoid sinus (a) with extension posteriorly to involve the anterior superior border of the clivus (b)