. Interpretation of dental and maxillary roentgenograms . Fig. 19.—High power view of epithelial cyst lining. 44 interpeetatioisj of eoentgenogeams iiially in the peridental membrane, where they are knownas debris epitJieliaux paradentaires of Malassez. Theseepithelial cells are believed to be remains of the outercells of the enamel organ which originally passed downand formed the outer wall of the sac in which the cemen-tum of the root was formed. Proliferation of theseepithelial cells found among the granulation tissue isstimulated by the chronic inflammatory process. The. Fig. 20.—Later sta
. Interpretation of dental and maxillary roentgenograms . Fig. 19.—High power view of epithelial cyst lining. 44 interpeetatioisj of eoentgenogeams iiially in the peridental membrane, where they are knownas debris epitJieliaux paradentaires of Malassez. Theseepithelial cells are believed to be remains of the outercells of the enamel organ which originally passed downand formed the outer wall of the sac in which the cemen-tum of the root was formed. Proliferation of theseepithelial cells found among the granulation tissue isstimulated by the chronic inflammatory process. The. Fig. 20.—Later stage of cyst formation, showing pressure atrophy of epithelial lining. mass of epithelium then breaks down in the center, it isbelieved by fatty degeneration, and a space is formedcontaining fluid (Figs. 18 and 19). This cyst cavity grad-ually enlarges, the pressure of the fluid causing atrophyof the epithelial cells, until the wall of the cyst consistsof a dense fibrous capsule lined with at most a few layersof epithelial cells (Fig. 20). All traces of epithelium mayfinally disappear. The cyst fluid is usually clear, straw- PATHOLOGY AND DE]SrTAL EOENTGE]S!OLOGY 45 colored, and may contain cliolesterin crystals, recognizedby their rectangular shape with a notch in one angle. Thefluid is generally sterile, but infection of the cyst wallmay convert it into pus from which various organismsmay be recovered. Dental root cysts may vary con-siderably in size, from that of a small pea to a hens egg(Figs. 217 and 243). In the maxilla, they may invade themaxillary sinus or th
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