. Journal of radiology . re frequently formed on theposterior sinus wall. These some-times are so large as to lead onelo think of a triple sinus. Over-reabsorption often causesthe sinus to be prolonged in vari- Watch The Journal—It Leads! 30 THE JOURNAL bus directions (a) into the lesserwings and clinoid processes, (b)into the anteroinferior angle; (c)into the pterygoid processes. When re-absorption extendsinto the lesser wings and clinoidprocesses, the sinns encroachesupon the optic nerve, often to suchan extent that the nerve comes tolie almost within the sinus cavityThe importance of this a
. Journal of radiology . re frequently formed on theposterior sinus wall. These some-times are so large as to lead onelo think of a triple sinus. Over-reabsorption often causesthe sinus to be prolonged in vari- Watch The Journal—It Leads! 30 THE JOURNAL bus directions (a) into the lesserwings and clinoid processes, (b)into the anteroinferior angle; (c)into the pterygoid processes. When re-absorption extendsinto the lesser wings and clinoidprocesses, the sinns encroachesupon the optic nerve, often to suchan extent that the nerve comes tolie almost within the sinus cavityThe importance of this anatomicalconfiguration cannot be over esti- OF RADIOLOGY maxillary sinus is in direct relationwith the sphenoid, only a thin par-tition of bone separating the twocavities. This formation is rare, butwhen present is particularly favor-able for operation on the sphenoidvia the maxillary sinus route. Re-absorption into the ptery-goid processes causes circum-scribed depression to be formed inthe floor of the sinus, thereby. Fig. XI.—Case No. 19401—Postero-anterior radiogramwith left sphenoid injected. mated, especially in connectionwith ophthalmic complications re-sulting from infection of thesinus mucosa. When the sinus extends intothe anteroinferior angle, the Watch The Journal favorinj and ? ™& . — poor lavage in case of suppuration. Over-extension of the posteriorethmoidal cell. Occasionally thesphenoid sinus is poorly devel-oped; a posterior ethmoidal cell -It Leads! SPHENOID SINUSES—HUBENY pushing it downward and back-ward and occupying the placewhere the sphenoid is normallysituated. thereby forming aspheno-ethmoidal cell. Underthese circumstances the posteriorethmoid cell is then in relation tothe optic chiasm and pituitarybody. Xot infrequently this cellis in relation to the splenoid sinusof the opposite side, and if dis-eased, it could easily communi-cate the infection to this cavity.
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