<prompt> Citellis angle is:Sold angleCP angleSinodural anglePa of MC Evans triangle  <response>: Sinodural Citellis angle, is the landmark for the superior petrosal sinus. Its is used to identify it while doing surgeries on this area. It is named after Salvatore Citelli, Italian laryngologist, 1875-1947. The other named terms after him are: Citellis Abcess: You can find about it in any standard text book for ENT like Dhingra. Citellis Syndrome: mental dullness, loss of power of concentration, and drowsiness or insomnia, seen in persons with adenoids or sinus infection. Citellis angle or sinodural angle is the angle between the sinus plate and the dural plate. This angle is acute in primary sclerosis but obtuse in secondary sclerosis i.e. Chronic Suppurative Otitis Media CSOM. 