Читать книгу Shear's Cysts of the Oral and Maxillofacial Regions - Paul M. Speight - Страница 18

Non‐odontogenic cysts of the jaws are mostly developmental in origin and arise from vestigial epithelial remnants of ductal structures or from inclusions at the line of fusion of the palatal shelves. The nasolabial and mid‐palatal raphe cyst actually occur in the soft tissues, but are so closely apposed to the maxillary bone that they are included in the classification of jaw cysts. The surgical ciliated cyst is included here because it arises within the alveolar bone of the maxilla. Pseudocysts are not epithelial lined, but are included because they are important in the radiological differential diagnosis of cystic jaw lesions. As discussed above, we are content to use ‘cyst’ as a diagnostic term for the simple bone cyst, since this is clearly understood and widely used by clinicians who recognise that they present clinically and radiologically as a cystic lesion. Stafne bone cavity is neither a cyst nor a pseudocyst, but is an anatomical anomaly causing an indentation of the mandible that appears as a cystic lesion on radiology or imaging. It is often included in classifications and we include it here because of its importance in the radiological differential diagnosis of cystic lesions. Osteoporotic bone marrow defects are controversial lesions, but they present as cystic radiolucencies and must also be considered in the differential diagnosis.