Subject: Odontogenic Cysts
Reviewed: May 21, 2012
Important NoteThis Clinical Policy Bulletin expresses our determination of whether certain services or supplies are medically necessary. We have reached these conclusions based on a review of currently available clinical information including:
We consider the removal of odontogenic cysts medically necessary when a differential diagnosis has accurately identified the lesion. Odontogenic cyst enucleation is considered by Aetna to be a distinct procedure when performed independently of other related surgical procedures. When performed concomitantly and in the same location as surgical tooth extraction, removal of an impacted tooth or an apicoectomy, we consider the removal of the cyst to be part of the related surgical procedure and a separate benefit would not be available for the cyst removal. However, when the expansion of the cyst is evident outside of the confines of the tooth, the removal of the cyst may be considered as a separate procedure.
Nonodontogenic cysts, odontogenic tumors and other related tumors of the jaw are not addressed by this policy.
All true odontogenic cysts are characterized by an epithelial lining. These cysts grow by expansion, and in doing so are identified radiographically by their characteristic radiolucency. They are believed to arise from the proliferation of normally quiescent epithelial cells in the jaw (that is, gingival rests of Serres, rests of Malassez). Cysts can be divided into inflammatory and developmental categories.
Radicular (periapical) Cyst - This is the most common odontogenic cyst (65% of all odontogenic cysts) and is thought to arise from the epithelial cell rests of Malassez in response to inflammation. Radiographic findings could be indicative of a nonvital tooth that has a small well-defined periapical radiolucency at its apex. Large cysts may involve a complete quadrant with some of the teeth occasionally mobile and some of the pulps nonvital. Root resorption may be seen. The cyst is painless when sterile and painful when infected. Treatment is extraction of the affected tooth and its periapical soft tissue or root canal if the tooth can be preserved.
Paradental Cyst - An inflammatory cyst forming most often along the distal or buccal root surface of partially impacted mandibular third molars, this cyst is thought to be the result of inflammation of the gingiva overlying a partly erupted third molar. Radiographically, it presents as a radiolucency in the apical portion of the root and represents from 0.5% to 4% of all odontogenic cysts. Treatment is by enucleation.
Dentigerous (follicular) Cyst - This is the most common developmental cyst (24% of all developmental cysts) and is thought to originate through the accumulation of fluid between reduced enamel epithelium and a completed tooth crown. It is usually found in the mandibular third molars, maxillary canines and maxillary third molars. These cysts are most prevalent in the second to fourth decades. Radiographically, a unilocular radiolucency with well-defined sclerotic margins encircling the crown of an unerrupted tooth is seen. Treatment is with enucleation or decompression followed by enucleation if large.
Lateral Periodontal Cyst - This cyst may arise from epithelial rests in the periodontal ligament, or may represent a primordial cyst originating from a supernumerary tooth bud. It is most frequently encountered in the mandibular premolar region in adult men over 40 years. On radiographs, this cyst is an interradicular radiolucency with well-defined or corticated margins. The adjacent teeth usually show some degree of root divergence and are vital. The treatment is surgical enucleation or curettage with preservation of adjoining teeth.
Odontogenic Keratocyst (OKC) - This is a specific and microscopically distinct form of odontogenic cyst that may assume the character of any of the odontogenic cysts. OKC comprises approximately 11% of all cysts of the jaws and are most often seen in the mandibular ramus and angle. It may be associated with the crown of a tooth appearing as a dentigerous cyst or may represent a keratinizing variant of the lateral periodontal cyst. Radiographically, it can mimic any of the jaw cysts and may appear as a well-marginated inter-radicular radiolucency, a pericoronal radiolucency or a multilocular radiolucency. Small OKCs may be treated with simple enucleation if the entire cyst lining can be removed. Association with an impacted tooth requires removal of the cyst and tooth.
Codes3D7450 -- Removal of benign odontogenic cyst or tumor - lesion diameter up to 1.25 cm
Revision DatesOriginal policy: March 12, 2007
The above policy is based on the following references:
1Cysts and Cystic Lesions of the Mandible: Clinical and Radiologic-Histopathologic Review : Robert J. Scholl, MD, Helen M. Kellett, MD, David P. Neumann, MD and Alan G. Lurie, DDS, PhD, From the Department of Diagnostic Imaging and Therapeutics, School of Medicine (R.J.S., H.M.K., D.P.N.), and the Department of Oral Diagnosis, Division of Oral and Maxillofacial Radiology, School of Dental Medicine (A.G.L.), University of Connecticut Health Center, 263 Farmington Ave, Farmington, CT 06030. Presented as a scientific exhibit at the 1997 RSNA scientific assembly. Received April 13, 1998; revision requested May 22; final revision received February 17, 1999; accepted February 17.
2Odontogenic Cysts and Tumors, Grand Rounds Presentation, UTMB, Dept. of Otolaryngology: Michael Underbrink, MD, MBA, Anna Pou, MD, Francis B. Quinn, Jr., MD and Matthew W. Ryan, MD. February 13, 2002
3American Dental Association. Current dental terminology, CDT-2011-2012; 61.*
*Current Dental Terminology. Copyright 2010 American Dental Association. All rights reserved.
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