PMC5671700_01
(a) Opacity and cystic appearance in the right maxillary sinus associated with the roots of the maxillary right first molar; (b) cholesterol granuloma characterized by numerous longitudinal clefts permeated by irregular eosinophilic material surrounded by foreign body giant cells and macrophages (hematoxylin-eosin stain, x100); (c) cystic mass in maxillary sinus in close association with the apex of the maxillary right second premolar; (d) foreign body reaction with accumulation of cholesterol clefts involving macrophages and foreign body giant cells (hematoxylin-eosin stain, x400).
CRIPA2017-5249161.001.jpg
PMC5671700_01_CRIPA2017-5249161.001.jpg
fig1
Radiographic evaluation revealed opacity and cystic appearance in the right maxillary sinus associated with the roots of the maxillary right first molar (Figure 1(a)). In the submucosa, numerous longitudinal clefts were observed after dissolution of the cholesterol crystals; these were permeated by irregular eosinophilic material and surrounded by foreign body giant cells and macrophages (Figure 1(b)). In the clinical and radiographic history, a cystic mass was observed in the right maxillary sinus in contact with root apex of the endodontically treated maxillary right second premolar (Figure 1(c)).