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Because the nasolabial cyst arises in soft tissues, in most cases there are no radiographic changes. Occasion- ally. press ure resorption of the unde rlying bone may occur. Histopathologic Features The na so lab ia l cys t is cha rac te ristica lly lined by pse udostrat ified co lumna r epi the lium, often dem onstrat ing gob let cells a nd cilia (Figure I-54) . Areas of cuboida l epithelium and squamous metaplasia are not unusual. Apocri ne changes also have been repo rted, The cyst wa ll is co mposed of fibro us co nnec tive tissue with adjacen t ske leta l mus cle.

If a noni nflamed lesion presents in an area of thin skin, such as the earlobe, it may be w hi te or yellow . Histopathologic Features Microscopic exa minat ion reveals a cavity that is lined by str atified squamous epit helium resemb ling epider mis (Figure 1- 66). A well- developed granular cell layer is seen, and th e lumen is fill ed w it h degenerating or t hokeratin . No t in frequently. th e epit heli al lin ing w ill be dis rup ted. whe n this occurs. a prominent granulomatous infla mmatory reaction.

As with torus palatin us, the cause of ma ndi bul ar tor i is probabl y multifactorial, includ ing bot h genetic and env iron mental influences. Clinical and Radiographic Features The mandibular tor us presents as a bo ny protube rance along the lingual aspect of th e mandible above the mylo hyoid line in the region of t he pr emolars (Figure 1- 41 ). Bilateral in volvem ent occurs in mor e than 900/0 of case s. Most mandibular tori occur as single nodules. although multiple lobules parallelin g the teet h are not unusual.

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Atlas of Orthodontics by Sandy


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