2.12.24
Quick Review #105 - #pathology #oralpathology #doctorgallagher #oralsurgery #oralsurgeon #dentist #dentistry #dental
The Odontogenic Keratocyst (OKC), commonly referred to as the Keratocystic Odontogenic Tumor (KCOT) due to its aggressive behavior and high recurrence rate, is a distinct type of developmental cyst:
• Clinical Features:
1. Age and Location: OKCs can occur at any age but are most commonly diagnosed in the second and third decades of life. They have a predilection for the posterior mandible, particularly the angle and ramus.
2. Asymptomatic Nature: Many OKCs are discovered incidentally on radiographs, as they tend to grow without causing significant symptoms. However, large lesions can cause swelling, displacement of teeth, or cortical bone expansion.
3. Recurrence: They are known for their high recurrence rate, attributed to their thin cyst lining and potential for daughter cysts within the fibrous capsule.
• Radiographic Features:
1. Radiolucency: OKCs appear as radiolucent areas on X-rays. The radiolucency can be unilocular or multilocular, with the latter sometimes described as having a "soap bubble" or "honeycomb" appearance.
2. Well-defined Borders: The lesions typically exhibit well-defined, sometimes scalloped, borders.
3. Effect on Surrounding Structures: They can cause displacement of teeth and resorption of tooth roots. Larger lesions may lead to thinning of the cortical bone.
• Histological Features:
1. Lining: The cyst lining is characterized by a thin (3-10 cell layers thick), parakeratinized stratified squamous epithelium. The surface may have a corrugated or wavy appearance.
2. Basal Cell Layer: A prominent feature is the palisaded arrangement of the basal cell layer, where the nuclei of the basal cells are aligned away from the basement membrane, giving a "picket fence" or "tombstone" appearance.
3. Keratin Content: The lumen of the cyst contains keratin, a feature that distinguishes it from other jaw cysts which typically do not have keratin.
The combination of these clinical, radiographic, and histological features helps in the diagnosis and management of OKCs. Due to their aggressive nature and potential association with Nevoid Basal Cell Carcinoma Syndrome (Gorlin Syndrome), accurate diagnosis and treatment planning are crucial.
References:
1. Borghesi, A., Nardi, C., Giannitto, C., Tironi, A., Maroldi, R., & Di Bartolomeo, F., et al. (2018). Odontogenic keratocyst: imaging features of a benign lesion with an aggressive behaviour. Insights into Imaging, 9(4), 883–897. https://doi.org/10.1007/s13244-018-0637-0
2. Shear, M., & Speight, P. M. (2017). Cysts of the Oral and Maxillofacial Regions (4th ed.). Wiley-Blackwell.
3. Neville, B. W., Damm, D. D., Allen, C. M., & Chi, A. C. (2015). Oral and Maxillofacial Pathology (4th ed.). Saunders.
4. ChatGPT. 2024.