Читать книгу Shear's Cysts of the Oral and Maxillofacial Regions - Paul M. Speight - Страница 61

  Classification and Terminology of Inflammatory Collateral Cysts

  Clinical Features Frequency Age Sex Site Clinical Presentation

  Radiological Features Radiological Differential Diagnosis

  Pathogenesis Relationship of the Paradental Cyst to the Dentigerous Cyst

  Histopathology

  Treatment

Inflammatory collateral cysts are cysts of inflammatory origin that are found towards the buccal aspect of the roots of partially or recently erupted teeth. They arise as a result of inflammation in the pericoronal tissues, but the pathogenesis and the epithelium of origin remain uncertain. Although it is possible for a collateral cyst to arise on any erupting tooth, the vast majority are associated with mandibular molars, with about 60% on third molars and most of the remainder seen on the buccal aspect of first or second molars. Thus, two main types of inflammatory collateral cyst are recognised: the paradental cyst, found predominantly on mandibular third molars, and the mandibular buccal bifurcation cyst, found on first or second molars (Speight and Soluk Tekkeşin 2022b ). In some respects the collateral cysts remain controversial, since it is clear that in some quarters their very existence is questioned. There are a number of papers reporting lesions associated with impacted third molars that do not include a single case of paradental cyst (Curran et al. 2002 ; Stathopoulos et al. 2011 ), while other series of pericoronal lesions on mandibular third molars have suggested that more than 50% may be paradental cysts (Costa et al. 2014 ). One reason for these discrepancies may be the very nature of the cyst itself. The lesion presents as a ballooning of the pericoronal tissues to form a pocket (Ackermann et al. 1987 ; Slater 2003 ) that some may not regard as a true cyst, while others regard it as a simple variant of a dentigerous cyst. Nevertheless, the clinical and radiological features are those of a cystic lesion and the inflammatory collateral cysts are widely accepted as an entity and are included in the World Health Organization (WHO) classification of jaw cysts (WHO 2022a ; Speight and Soluk Tekkeşin 2022b ).