Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: I/O warning : failed to load external entity "file:////srv/scielo/www/bases/xml/rpr/v28n5/1561-3194-rpr-28-05-e6541.xml" in /srv-new/scielo/www/htdocs/class.XSLTransformerPHP5.php on line 36 Displasia fibrosa de senos paranasales. Presentación de Caso