FIGURE 16.

Second relapse of a neuroblastoma (T) of the right nasal fossa and maxillary sinus. Coronal reformatted computed tomography (CT) (A) and axial CT with contrast medium (B) images show complete invasion of the optic canal (o), superior (dashed arrow) and inferior orbital fissure (arrowhead) on the right compared to the normal left side (indicators for the normal left side). Axial CT scan (C, D, bone window) shows enlarged right vidian canal with slight blurring of its contour (black arrow) as compared to the left (white arrow). The right foramen rotundum (ellipse) is eroded compared to the left side (*). Notice the normal fat pad in the left pterygopalatine fossa (PPF) and total obliteration on the right.