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Cystic lesion of the jaws

الكلية كلية طب الاسنان     القسم جراحة الوجة والفكين     المرحلة 4
أستاذ المادة احمد صلاح حميد التميمي       22/03/2020 10:01:03
Cystic lesion of the jaws: cyst is a pathological cavity lined by epithelium and contained fluid or semi-fluid material and surrounded by connective tissue capsule. There are different classification of the cystic lesion, in general cystic lesion of the jaws can be classified into:
1- Odontogenic (arises from tooth structures) 2- non-odontogenic.
The odontogenic could be inflammatory ( periapical cyst) or developmental such as eruption cyst, dentigerous cysts and keratocyst. Non-odontogenic like fissural cyst (median mandibular cyst and globulomaxillary cyst) and bone cyst (simple bone cyst). Cystic lesion arises from soft tissue of oral and per-oral region also could be seen such as ranula and thyroglossal duct cyst.
Cystic lesion also can be classified into:
1- True cyst such as P.A cyst.
2- Pseudocyst such as simple bone cyst.

Development of cystic lesion of the jaws:
There are two stages for cystic development: initiation or formation and enlargement. The initiation stage is different according to each cystic lesion i.e the initiation of periapical cyst is different from that of eruption or dentigerous cyst. The enlargement of the cystic lesion may occur as a result of increase in the hydrostatic pressure of the cyst or other mechanisms.

Clinical manifestation of cystic lesion:
Cystic lesion of the jaws manifested as painless swelling in the upper or lower jaw. However, infected cyst presents with pain. Sometimes, cyst can be discovered by routine radiographical examination of the jaws. Large cystic lesion may cause anesthesia or paresthesia by pressing on the adjacent nerves such as mental nerve, or drifting of the neighboring teeth and even resorption of bone cortex. Teeth loosening and discoloration could be another clinical manifestation of cystic lesion. Pathological fracture of the lower jaw may occur when the cystic lesion enlarged enough to involve the upper and lower cortices.

Diagnosis:
1- History: history of tooth extraction indicates residual cyst.
2- Clinical examination: through clinical manifestations and effects of the cystic lesion on adjacent structures.
3- Radiographical images such as periapical, occlussal or orthopantographic (OPG) views. Three-D images such as CBCT and CT scan can be used as well. Cyst usually appears as a well-demarcated unilocullar or multilocullar radiolucency surrounded by a radiopaque layer.
4- Fine needle aspiration: range from clear to straw or yellowish fluid.
5- Histological examination (biopsy).


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .