ABOMP Oral Pathology key terms

A clinical term for a white patch or plaque of the oral mucosa that cannot be wiped off and cannot be classified as any other definable white lesion; diagnosis of exclusion requiring biopsy to rule out dysplasia or carcinoma.

A clinical term for a persistent red patch of the oral mucosa that cannot be attributed to any other identifiable cause; carries a high risk of harboring severe dysplasia or invasive carcinoma.

A uniformly flat, thin white plaque with consistent texture and color throughout, generally carrying lower malignant transformation risk than the speckled or nodular (nonhomogeneous) variant.

An aggressive, multifocal form of leukoplakia that spreads and thickens over time, often resistant to treatment and carrying a high rate of transformation to verrucous or squamous carcinoma.

Disordered maturation and cytologic atypia of epithelium, graded mild, moderate, or severe based on architectural and cellular changes; a precancerous change indicating increased risk of progression to carcinoma.

Full-thickness epithelial dysplasia with severe cytologic atypia in which malignant cells are confined by the basement membrane and have not invaded underlying connective tissue.

A malignant neoplasm of stratified squamous epithelium showing invasive nests of atypical keratinocytes into connective tissue, often with keratin pearls and intercellular bridges; the most common oral malignancy.

A low-grade, well-differentiated variant of squamous carcinoma presenting as a broad, warty, exophytic mass with pushing rather than infiltrative borders and minimal cytologic atypia.

A concentric whorl of keratinized cells within invasive epithelial nests, a histologic feature of well-differentiated squamous cell carcinoma.

The thin extracellular layer separating epithelium from underlying connective tissue; its integrity distinguishes in situ from invasive carcinoma, and its disruption permits stromal invasion.

A developmental cyst of odontogenic origin lined by a thin, uniform parakeratinized stratified squamous epithelium with a corrugated surface and palisaded basal layer; tends to grow along bone and recur.

Keratinized layer in which nuclei are retained, characteristic of the lining of an odontogenic keratocyst and used as a diagnostic microscopic feature.

Keratinized layer lacking retained nuclei; its presence with a granular cell layer helps distinguish other odontogenic cysts from the parakeratinized odontogenic keratocyst.

An odontogenic cyst that encloses the crown of an unerupted tooth and attaches at the cementoenamel junction, lined by nonkeratinized stratified squamous epithelium.

A benign but locally aggressive odontogenic epithelial tumor forming islands and strands with peripheral palisading and reverse polarization of basal cells, often in the posterior mandible.

Microscopic arrangement in which the nuclei of palisaded basal cells are displaced away from the basement membrane, a characteristic feature of ameloblastoma.

An inherited condition featuring multiple odontogenic keratocysts, palmar and plantar pits, and skeletal anomalies; also called Gorlin syndrome.

The most common benign salivary gland tumor, showing a mixture of epithelial and myoepithelial cells in a chondromyxoid stroma; also called benign mixed tumor.

A malignant salivary gland tumor composed of mucous, intermediate, and epidermoid cells, often with cystic spaces; the most common salivary malignancy.

A contractile epithelial cell surrounding acini and ducts of salivary glands; its presence contributes to the biphasic appearance of pleomorphic adenoma.

A glycoprotein secretion that stains positively with mucicarmine and PAS, used to identify mucous cells and cystic spaces in salivary gland tumors such as mucoepidermoid carcinoma.

An autoimmune blistering disease with IgG antibodies against desmogleins, producing suprabasal intraepithelial separation and oral erosions; shows a positive Nikolsky sign.

Separation of the epithelium from underlying tissue with gentle lateral pressure, seen in blistering diseases with intraepithelial or basement membrane cleavage such as pemphigus vulgaris.

A chronic autoimmune subepithelial blistering disease with antibodies against basement membrane components, causing desquamative gingivitis and possible conjunctival scarring.

A cytologic preparation from the base of a blister examined for acantholytic epithelial cells, used as a rapid aid in diagnosing pemphigus vulgaris.

Loss of intercellular adhesion between epithelial cells, producing rounded detached cells and intraepithelial clefting, a hallmark of pemphigus vulgaris.

A cell-to-cell adhesion junction linking keratinocyte cytoskeletons; its disruption by autoantibodies underlies acantholysis in pemphigus vulgaris.

A chronic immune-mediated mucocutaneous disorder producing white reticular striae, erosions, or plaques; microscopically shows a bandlike lymphocytic infiltrate and basal cell degeneration.

A necrotic, eosinophilic apoptotic keratinocyte found in the basal layer or superficial connective tissue, a microscopic feature of lichen planus.

A pointed, jagged appearance of epithelial rete ridges, a histologic pattern often seen in lichen planus and some other interface dermatitides.

A common benign reactive nodule of fibrous connective tissue on the oral mucosa, usually arising at sites of chronic irritation; also called irritation fibroma.

A reactive vascular proliferation presenting as a rapidly growing, bleeding red nodule, often on the gingiva; microscopically shows lobular capillary proliferation with inflammation.

A pyogenic granuloma-like reactive vascular lesion of the gingiva occurring during pregnancy, driven by hormonal and plaque-related factors and often resolving after delivery.

A reactive fibrous hyperplasia of the vestibular mucosa caused by chronic irritation from an ill-fitting denture flange, appearing as a fold of tissue.

Chronic erythematous inflammation of the denture-bearing mucosa, commonly associated with Candida albicans and poor denture hygiene or fit.

Infection by Candida species, usually C. albicans, presenting as pseudomembranous plaques, erythema, or angular cheilitis; diagnosed by smear or culture and treated with antifungals.

A removable white layer of fibrin, necrotic cells, and organisms overlying inflamed mucosa, characteristic of pseudomembranous candidiasis and wipeable on examination.

Removal of a representative portion of a lesion for microscopic diagnosis, appropriate for large or diffuse lesions where complete excision would be impractical.

Complete removal of an entire lesion with a margin of normal tissue for both diagnosis and treatment, generally used for small lesions.

Sampling of cells from a mass using a thin needle and syringe, useful for evaluating salivary gland and neck masses before definitive surgery.

A dark area on a radiograph produced by reduced attenuation of x-rays, indicating less dense tissue such as cyst, tumor, or marrow space.

A light or white area on a radiograph produced by increased attenuation of x-rays, indicating dense tissue such as bone, enamel, or calcification.

A benign fibro-osseous lesion of the tooth-bearing jaw that progresses from radiolucent to mixed to radiopaque; usually managed conservatively with observation.

Death of bone after therapeutic radiation, presenting as exposed nonhealing bone without tumor recurrence; managed with conservative care and possibly surgery or hyperbaric oxygen.

Exposed jaw bone persisting for weeks in a patient receiving antiresorptive or antiangiogenic therapy without head and neck radiation, often after extraction.

Systematic classification of cancer extent by tumor size, nodal involvement, and metastasis (TNM), guiding prognosis and treatment planning.

Microscopic assessment of tumor differentiation, from well to poorly differentiated, used with staging to predict behavior and guide management.