The presentation of odontogenic keratocysts in the jaws with an emphasis on the tooth-bearing area: a systematic review and meta-analysis

Recurrence Patterns of Odontogenic Keratocysts in Syndromic and Non-Syndromic Patients

Purpose

Odontogenic keratocysts (OKCs) have high recurrence rates. We aimed to identify recurrence patterns in OKCs and the onset of second primary OKCs in non-syndromic and syndromic patients.

Material and Methods

Patients with OKCs reporting to our department from 1998 to 2021 (23 years) were retrospectively evaluated using demographic, clinical (age, sex, location, and size), histopathological, radiographic, and treatment data. All patients were followed-up for > 3 years and evaluated for OKC recurrence. Patients with naevoid basal cell carcinoma syndrome (NBCCS) were evaluated separately.

Results

We included 38 and 13 patients in the non-syndromic and syndromic OKC groups, respectively. The recurrence rates were 15.8 and 21.4% in the non-syndromic and syndromic groups, respectively; 8.9% of patients exhibited a second recurrence and 1.8% a third recurrence. No second primary OKCs were observed in the non-syndromic group; 76.9% of patients in the syndromic group developed at least one.

Conclusion

We found a higher recurrence rate in patients with NBCCS compared with patients with non-syndromic OKCs (21.4 versus 15.8%). The probability of developing a second primary OKC in patients with NBCCS was higher compared with that in patients with non-syndromic OKCs (76.9 versus 0%). No statistically significant risk factors for OKC recurrence were identified.

Odontogenic keratocystic can be misdiagnosed for a lateral periodontal cyst when the clinical and radiographical findings are similar

Lateral periodontal cyst (LPC) and odontogenic keratocystic (OK) are two osteolytic lesions of the jaw with different local invasiveness and percentage of recurrence. The aim of this study was to highlight the attention on the differential diagnosis of these lesions that sometimes can have unexpected location and can lead doubts on diagnosis, therapy, and follow-up. A 34-year-old man presented to our department with a complaint of soft pain in the vestibular aspect of left mandibular second premolar and left mandibular first molar. Vital teeth in the left mandible, no mucosal swelling, and no drainage were observed. The CBCT showed a well circumscribed hypodensity area, extending between 3.5 and the apex of mesial root of 3.6. No displacement and no resorption of the roots were notified. Upon clinical and radiographical examination, a provisional diagnosis of LPC was made and enucleation of the lesion and histological examination were planned. Histologically, a cystic wall partially lined by a keratinizing squamous epithelium was observed. Surrounding and within the lesion, there was a chronic inflammatory infiltrate also of granulomatous type and with cholesterol clefts. Based on these findings, the diagnosis of odontogenic keratocystic was done. Radiolucent lesions in the premolar and canine region are frequently clinically and radiographically misdiagnosed. The identification of keratocyst in a location preoperatively favoring a lateral periodontal cyst should be suspected and biopsy must be considered in all cases to establish the nature of the lesion, the best surgical treatment, and the follow-up appointments.

Load transfer across a mandible during a mastication cycle: The effects of odontogenic tumour

The extent to which load transfer in a diseased mandible with odontogenic tumour might influence the potential risk of pathological fracture has scarcely been investigated. The study sought to investigate the quantitative deviations in load transfer across healthy and cancer-affected (diseased) mandibles having odontogenic tumours. The effect of size of the tumours (small: 9 mm diameter, large: 19 mm diameter), and variation in bone mechanical (elastic) properties of the mandible on load transfer in cancer-affected mandibles during a mastication cycle have been investigated. Based on patient-specific computed tomography-scan datasets, detailed three-dimensional finite element models of healthy and diseased mandibles were developed. High stresses of 25-30 MPa and strains ∼700 µε were observed in the healthy mandible during the right molar bite. However, marginal deviations were observed in principal stress distributions in the diseased mandibles with small- and large-sized tumours, as compared to the healthy mandible. Maximum principal strains of ∼1474 µε were found in the body region adjacent to the symphysis region for small-sized tumour. Whereas for large-sized tumour, maximum strains of ∼2700 µε were observed in the right buccal regions. Reduction in Young's modulus due to different stages of odontogenic tumours had a localised effect on the principal stress distributions, but triggered an abrupt increase in the principal tensile strains. It appears that there is a potential risk of pathological fracture for large-sized odontogenic tumour, owing to high tensile stresses and strains.

Conservative management of odontogenic keratocyst with long-term 5-year follow-up: Case report and literature review

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The World Health Organization, in the last classification of the Head and Neck tumours defined Odontogenic Keratocyst as a cyst instead of a tumor.

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There are plenty of approaches in order to reduce the high recurrence of this lesion consisted in surgical, non-surgical and combined treatment.

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Surgical treatment is considered, for several years as the gold standard treatment, but currently a combined therapy has become as a first choice.

Introduction

Odontogenic Keratocyst (OKC) is a benign lesion recently considered an odontogenic cyst in the present World Health Organization (WHO) classification of Head and Neck tumors (2017) mainly based on its clinical and histopathological features. Several studies, systematic reviews and meta-analyses have shown a multimodal approach to reducing the high recurrence rates inherently exhibited by this pathological condition after long-term periods of follow-up.

Presentation of case

The patient, a 67-years-old woman, was submitted to conservative surgical management of an odontogenic keratocyst. Initially this consisted of decompression and subsequent enucleation, with a long-term period of follow-up to ensure that there was no recurrence.

Discussion

Conservative surgical management is the first choice and might be considered the gold standard, but combined therapy such as marsupialization, application of Carnoy’s solution, enucleation of the remnant lesion and an extensive follow-up period would considerably reduce recurrence rates.

Conclusion

Therefore, an appropriate long-term follow-up must be done after the treatment performed in order to ensure clinical success, which in this case was described as an absence of signs of recurrent disease.