PMC5637856_01
Coronal (a) and sagittal (b) CBCT-scan: well-defined hypodense lesion involving a distal and apical region (endo-perio lesion) of the endodontically treated right maxillary first molar. Maxillary and ethmoidal sinusitis and a perforation of the lesion into the right maxillary sinus cavity are also observed.
CRIPA2017-6249649.001.jpg
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fig1
A deviation of the nasal septum on the right is also outlined (Figures 1(a) and 1(b)).
Histological aspect of radicular cyst: (a) cystic cavity containing hemorrhagic exudate and neutrophils lined exclusively by ciliated pseudostratified columnar epithelium. The wall of the cyst consists of fibrous connective tissue with an intense chronic inflammatory infiltrate. (HES, x6.4). (b) High magnification showing the ciliated pseudostratified columnar epithelium and inflammatory infiltrate represented by lymphocytes, plasma cells, and some neutrophils (HES, x60).
CRIPA2017-6249649.002.jpg
PMC5637856_01_CRIPA2017-6249649.002.jpg
fig2
The cyst wall consisted of fibrous connective tissue containing an intense chronic inflammatory infiltrate mainly represented by lymphocytes and plasma cells (Figures 2(a) and 2(b)).