Lichen Sclerosus of the Upper Lip: Report of a Case, Utilizing Shikata's Modified Orcein Stain, and Review of the Literature.

OBJECTIVES: Lichen sclerosus is a rare chronic inflammatory disorder, affecting mainly the skin and the anogenital mucosa, while oral lesions can be the primary or the only manifestation of the disease. A rare case of oral lichen sclerosus, assessed histopathologically and histochemically, is presented, along with a thorough review of the English language literature. MATERIAL AND METHODS: A 32-year-old female presented an asymptomatic white patch affecting the skin and the mucosa of the upper lip, without other mucocutaneous involvement. A partial biopsy of the lesion was performed, along with the histochemical Shikata's modified orcein stain for elastin fibres detection. A literature review was also performed, discussing the epidemiological data, clinical presentation, and treatment modalities of all published cases with oral involvement. RESULTS: The histopathological evaluation revealed the presence of acellular zone underneath the basal layer of the epithelium, accompanied by deep band-like chronic inflammation. Shikata's modified orcein stain exhibited scarcity or loss of elastin fibres in the acellular subepithelial area. The diagnosis of lichen sclerosus was made. Topical application of corticosteroids was prescribed and resolution of the lesion was observed. Literature review revealed that oral lichen sclerosus is predominantly presented in females, as asymptomatic lesions of the lips and buccal mucosa; few cases have extraoral manifestations and topical corticosteroids are the main treatment intervention. CONCLUSIONS: Despite its rarity, lichen sclerosus should be considered in the clinical and histopathological differential diagnosis of white patches of the oral mucosa. For rendering proper diagnosis, the histochemical Shikata's modified orcein stain is a useful assessment tool.

Immunohistochemical Analysis of the Activation Status of the Akt/mTOR/pS6 Signaling Pathway in Oral Lichen Planus.

Introduction. Aberrations of the Akt/mTOR/pS6 pathway have been linked to various types of human cancer, including oral squamous cell carcinoma (OSCC). The purpose of this study was to evaluate the activation status of Akt, mTOR, and pS6 in oral lichen planus (OLP) in comparison with oral premalignant and malignant lesions and normal oral mucosa (NM). Materials and Methods. Immunohistochemistry for p-Akt, p-mTOR, and phospho-pS6 was performed in 40 OLP, 20 oral leukoplakias (OL), 10 OSCC, and 10 control samples of NM. Results. Nuclear p-Akt expression was detected in the vast majority of cases in all categories, being significantly higher in OL. Cytoplasmic p-Akt and p-mTOR staining was present only in a minority of OLP cases, being significantly lower compared to OL and OSCC. Phospho-pS6 showed cytoplasmic positivity in most OLP cases, which however was significantly lower compared to OL and OSCC. Conclusions. Overall, cytoplasmic p-Akt, p-mTOR, and phospho-pS6 levels appear to be significantly lower in OLP compared to OL and OSCC. However, the expression of these molecules in a subset of OLP cases suggests that activation of Akt/mTOR/pS6 may occur in the context of OLP, possibly contributing to the premalignant potential of individual cases.

Cemento-osseous dysplasia-like lesion and complex odontoma associated with an impacted third molar.

We present a case of a 36-year-old female with a benign fibro-osseous lesion consistent with cemento-osseous dysplasia (COD) that was located coronally to the crown of an impacted mandibular third molar tooth and was associated with a complex odontoma. The pathogenesis of this unusual association is discussed and the odontogenic origin of COD is suggested.