A quote from my positioning book in the Paranasal Sinuses chapter:"Exudate contained in the [paranasal] sinuses is not fluid in the usual sense of the word but is commonly a heavy, semigelatinous material. The exudate, rather than flowing freely, clings to the walls of the cavity and takes several minutes, depending on its viscosity, to shift position".
Eewwwwwwww!
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