Why are Traumatic Bone Cysts Regarded as Pseudocysts?
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In accordance with the World Health Organization classification, Traumatic Bone Cysts belong to a bone-related group of lesions in which bony lesions such as aneurysmal bone cyst, fibrous dysplasia, ossifying fibroma, central giant cell granuloma, osseous dysplasia, and cherubism are also included. However, the characteristic that demarcates TBCs from the mentioned true cysts is the absence of epithelial lining, which is why TBCs are regarded as pseudocysts.

The TBC is a nonneoplastic intraosseous lesion that mostly affects patients in their second decade of life, the approximate mean age of patients is 20 years. The majority of TBCs taking place in the maxillofacial region are preferentially located in the body and symphysis of the mandible, only a few cases in the condylar and anterior regions of the mandible have been reported, whereas maxillary lesions are even rarer.

A 13-year-old girls OPG revealed a well-defined radiolucency with a size of 19 × 10.6 mm in the anterior region of the mandible with no perforation of buccal or lingual cortical layers and no resorption or displacement of the roots. A pulp vitality test was performed from the left mandibular canine to the first premolar on the right side, which yielded a positive response.

The surgical approach to the lesion was performed by corticotomy of buccal aspect of the lesion with a round burr, revealing a vacant cavity without an epithelial component, which confirmed the diagnosis of Traumatic Bone Cyst. The flap was closed with a Vicryl 3-0 suture (Ethicon, Somerville, NJ, USA) after irrigation of the cavity. The patient reported no complaint during the 6-month follow-up period, and osteogenesis in the defect area was observed

Source: https://jmedicalcasereports.biomedcentral.com/articles/10.1186/s13256-019-2220-7