<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Inflammation of the frontal sinus; in most cases the infection is caused by the bacteria STREPTOCOCCUS PNEUMONIAE and HAEMOPHILUS INFLUENZAE. This condition may be acute or chronic.</n0:def-definition><n0:def-source>MSH2003_2003_05_12</n0:def-source></n0:ComplexDefinition>