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The exact underlying cause of leukoplakia is largely unknown, [1] but it is likely multifactorial, with the main factor being the use of tobacco. [29] Tobacco use and other suggested causes are discussed below. The mechanism of the white appearance is thickening of the keratin layer, called hyperkeratosis.
White sponge nevus (WSN) is an extremely rare autosomal dominant [4] condition of the oral mucosa (the mucous membrane lining of the mouth). It is caused by one or more mutations in genes coding for keratin, which causes a defect in the normal process of keratinization of the mucosa.
Alveolar mucosa, the lining between the buccal and labial mucosae. It is a brighter red, smooth, and shiny with many blood vessels, and is not connected to underlying tissue by rete pegs. [6] Buccal mucosa, the inside lining of the cheeks; part of the lining mucosa. Labial mucosa, the inside lining of the lips; part of the lining mucosa. [7]
Tobacco is the greatest single cause of oral and pharyngeal cancer. Using tobacco increases the risk of oral cancer by 3 to 6 times [20] [9] and is responsible for around 40% of all oral cancers. [21] Smokeless tobacco (including chewing tobacco, snuff, snus) also causes oral cancer. [22] [23] [24] Cigar and pipe smoking are also important risk ...
Parakeratosis is a mode of keratinization characterized by the retention of nuclei in the stratum corneum. [1] In mucous membranes , parakeratosis is normal. [ 2 ] In the skin, this process leads to the abnormal replacement of annular squames with nucleated cells.
Accumulation of these cancer cells causes a microscopic focus of abnormal cells that are, at least initially, locally confined within the specific tissue in which the progenitor cell resided. This condition is called squamous-cell carcinoma in situ , and it is diagnosed when the tumor has not yet penetrated the basement membrane or other ...
Early lesions may appear as thin, translucent and granular or wrinkled mucosa. [2] [6] The later lesion may appear thicker, more opaquely white and hyperkeratotic with fissures and folds. [6] [2] Oral snuff causes more pronounced changes in the oral mucosa than tobacco chewing. [1] Snuff dipping is associated more with verrucous keratosis. [1]
A mucinous neoplasm (also called colloid neoplasm) is an abnormal and excessive growth of tissue with associated mucin (a fluid that sometimes resembles thyroid colloid).