| | intranasale excisie van sinus frontalis, sinus ethmoidalis en sinus sphenoidalis (verrichting) |  |  | intranasale excisie van sinus frontalis, sinus ethmoidalis en sinus sphenoidalis |  |  | Intranasal frontoethmosphenoidectomy |  |  | FESS - Functional sinus surgery - frontoethmosphenoidectomy
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