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Histogram showing proportions of the different sinus compartments that were affected in 100 horses with sinus disease at each of three different centers. RMS, rostral maxillary sinus; VCS, ventral conchal sinus; CMS, caudal maxillary sinus; DCS, dorsal conchal sinus; FS, frontal sinus; ES, ethmoidal sinus (also termed the middle conchal sinus); SPS, sphenopalatine sinus (RDSVS, University of Edinburgh; RVC, University of London).
