The epithelized oral sinus tract.
Sinus tracts that extended from periapical lesions to the alveolar mucosa were surgically removed and examined microscopically. The results indicate that sinus tracts may be lined with stratified squamous epithelium. More commonly, however, these tracts are lined with granulation tissue.
D003751:Dental Fistula / Q000473:pathology*; D004848:Epithelium / Q000473:pathology; D006097:Granulation Tissue / Q000473:pathology; D006801:Humans; D009061:Mouth Mucosa / Q000473:pathology