Terminologies used in

Oral Pathology

Terminology/ Nomenclature Communication Documentation Description Classification/

categorization

Types

General terms Clinical terms Histologic terms

Definition

Maximum expression in minimum words

General terms

Provisional diagnosis Diagnosis arrived at after history

taking and clinical examination but before any investigations.

Preliminary educated assumption or guess as to the nature or status of the condition prior to the analysis of other diagnostic data

Differential diagnosis

Process of identifying a particular disease process by differentiating it from all other pathologic processes that may have similar signs and symptoms or clinical course

Final Diagnosis

Diagnosis arrived after all the data (History, clinical examination and investigations ) has been collected, analyzed and subjected to logical thought.

Prognosis

Prediction of the course, duration and termination of a disease and the likelihood of its response to treatment

Investigations

Steps undertaken to confirm a diagnosis which was established following case history taking and physical examination.

Laboratory Investigations

Extension of physical examination in which tissue, blood,urine, saliva or any other specimen is obtained from the patients body and subjected to microscopic, biochemical, microbiological or immunological examination

Clinical terms

Inspection

Systematic visual assessment of the patient

Palpation

Method of examining with the hands using the sense

of touch

Percussion

Technique of striking the tissues with the fingers or an instrument so that the examiner may listen to the resulting sounds or note the response of the patient to such action

Auscultation

Technique of listening to sounds produced in the body using a stethoscope.

Lesion

Morphologically altered tissue with objective signs of disease

Symptom

Any change in the body or its function that is perceptible to the patient and may indicate a disease.

Eg : Pain

Sign

Any change in the body or its function that is perceptible to a trained observer and may indicate a specific disease.

Eg : Tenderness

Hypersensitivity

Exaggerated response to any stimulus which otherwise would not have caused the same degree of response.

Abscess

Acute inflammatory reaction localized within the tissue and associated with tissue destruction and liquefaction as well as pus formation

Cellulitis

Acute inflammation which spreads diffusely through the tissue spaces and along tissue planes and usually suppurative in nature.

Exudate

It is the edema fluid produced by certain inflammatory reactions having a higher specific gravity

(1.020 or higher) and a higher protein content (1-6 gm/dl)

Transudate

It is the edema fluid produced by certain noninflammatory conditions having a low specific gravity and a low protein content

Macule

Well circumscribed

flat area of altered coloration varying in size from a pinhead to several cms

Macule

Macule/Patch

Papule

Small well circumscribed solid,elevated lesion less than

5 mm in diameter

Nodule

well circumscribed solid,elevated lesion more than

5 mm in diameter

Nodule

Plaque

Vesicle

Small well circumscribed

fluid filled lesion less than 5 mm

in diameter

Bulla

well circumscribed

fluid filled lesion larger than 5 mm

in diameter

Bullae

Pustule

well circumscribed

pus filled lesion

smaller than 5 mm

in diameter

Erosion

Break in the

epithelium extending to

but not involving

the basal cell layer

Erosion

Ulcer

Break in the continuity

of the entire epithelium

with the resultant exposure of the underlying connective tissue

Ulcer

Sinus

•

Blind tract which connects a cavity lined by granulation tissue to the epithelial surface

Fistula

• Communication between two

epithelium lined surfaces

Example:

Oro antral fistula

White lesion

• Abnormal area of oral mucosa

which appears whiter than the surrounding tissue and is usually slightly raised, roughened or of a different texture than the adjacent

normal tissue.

Keratotic White Lesion

• White lesion of the oral cavity

which cannot be removed by rubbing or scraping

Non Keratotic White Lesion

• White lesion of the oral cavity which can be removed by rubbing

or scraping

Premalignant lesion

• Morphologically altered tissue

in which cancer is more likely to occur than its apparently normal counterpart

Eg: Leukoplakia

Premalignant Condition

• Generalized state associated with

significantly increased risk of developing cancer

Eg: Iron deficiency anemia

Hamartoma

• Tumour like malformation characterized by the presence of particular histologic tissues in improper proportions or distribution with a prominent excess of one type of tissue.

Eg: Haemangioma

Teratoma

• True neoplasm made up of a number of different types of tissues that are not native to the area in which the

tumour occurs.

Choristoma

• Microscopically normal cells present in abnormal location

Eg: Fordyces granules

Neoplasm

• Abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of the normal tissue and persists in the same excessive manner even after the cessation of the stimulus that evoked the change

Hypertrophy

• Increase in the size of an organ or

tissue due to an increase in the size of the cells

Example: Masseteric hypertrophy

Hyperplasia

• Increase in the size of an organ or

tissue due to an increase in the number of the cells

Example: Gingival hyperplasia

Hypoplasia

• Incomplete development of an

organ or tissue

Example: Enamel hypoplasia

Aplasia

• Complete failure of formation of

organ/tissue

Example: Condylar aplasia

Atrophy

• Decrease in the size of an organ or

tissue after complete formation

Example: Papillary atrophy

Pedunculated

Pedunculated

Sessile

Sessile

Diffuse

Coalescing

Exophytic

Firm

Cheesy

Hard

Histologic terms

•

Hyperkeratosis

Thickening of the stratum corneum

Acanthosis

Thickening /Widening of the stratum spinosum

Spongiosis

Intercellular edema

Acantholysis

Separation of cells in stratum spinosum resulting in intraepithelial split

Dysplasia

Irregular, atypical proliferative changes in the epithelium in response to chronic irritation or inflammation

Anaplasia

Reversal of highly differentiated cells into a less differentiated type

Metaplasis

• Is the reversible replacement of one differentiated cell type with another mature differentiated cell type

Metastasis

• Metastasis is a complex process that involves the spread of a tumor or cancer to distant parts of the body from its original site

Mutation

• A relatively permanent change in hereditary material involving either a physical change in chromosome relations or a biochemical change in the codons that make up genes