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 Indian J Med Microbiol  
 

Figure 3 (A-D): Types of Clival extension. Pictorial representation with horizontal lines at the inferior margin of sella (brown line) and along the vidian canal (purple line), and vertical line (orange line) along the posterior wall of sella. 3A – Subdorsal; Pneumatization not extending above the inferior margin of sella or below the level of the vidian canal. 3B – Dorsal; Pneumatization extending superiorly into the dorsum sella. 3C – Occipital; Pneumatization extending inferior to the level of the vidian canal. 3D – Combined; Dorsal + Occipital

Figure 3 (A-D): Types of Clival extension. Pictorial representation with horizontal lines at the inferior margin of sella (brown line) and along the vidian canal (purple line), and vertical line (orange line) along the posterior wall of sella. 3A – Subdorsal; Pneumatization not extending above the inferior margin of sella or below the level of the vidian canal. 3B – Dorsal; Pneumatization extending superiorly into the dorsum sella. 3C – Occipital; Pneumatization extending inferior to the level of the vidian canal. 3D – Combined; Dorsal + Occipital