No abstract

Lichen planus (LP) is a chronic disease of the skin and mucous membrane. Oral lichen planus (OLP), the mucosal counterpart of cutaneous lichen planus that presents with a variety of clinical features, about 25% present with oral lesions alone. Patients may develop white striations, white papules, white plaques, erythema, erosions, or blisters affecting predominantly the posterior buccal mucosa bilaterally. The clinical presentation of OLP ranges from mild painless white keratotic lesions to painful erosions and ulcerations. The diagnosis of OLP was based on history, clinical findings and histopathological features. There is no consensus on a single set of criteria for the diagnosis of OLP. Some investigators use only the clinical criteria, while others use both clinical and histopathologic criteria. Furthermore final diagnosis was confirmed by Immunohistochemical staining (IHC) with CD8 precursor cells. The possibility of this lesion to turn malignant justifies the importance of early definitive diagnosis and long term follow up for patients with such disease.

The traumatic bone (TBC) cyst is an uncommon benign empty or fluid containing cavity within bone that is not lined by epithelium. The etiopathogenesis of TBC is still unknown. TBC is frequently encountered in young patients during the second and third decades of life. Sex predilection is equal but some studies in literature suggest clear female predominance. Body of the mandible between the canine and the third molar is the most common site (75%) in head and neck region followed by mandibular symphysis. The cysts are usually asymptomatic. Associated teeth are usually vital with no resorption or displacement. It expands the cortices and, seldom, intraoral or extra oral swelling may be seen. Most of the TBCs are diagnosed incidentally in orthopantomogram (OPG). On radiographic examination, a unilocular irregular but well defined lytic lesion is seen characteristically extending between the roots of the teeth. TBC is representing approximately 1% of all jaw cysts. A final diagnosis of a TBC is almost invariably made at the time of surgery, where in identification of an empty air-filled cavity serves as a valuable diagnostic tool. Surgical exploration was proved not only essential in making the right diagnosis but also curative from a treatment plan perspective. Recurrence of TBC is assumed to be extremely rare. However, a distinct proportion of recurrences may occur.