Transcript
NEOPLASIA
• Neo – new
• Plasia – growth
• Neoplasia - new growth
• Oncology – study of neoplasia
• Oncos – tumor
• Ology – study
• Neoplasia - new growth, non-cancerous or cancerous.
• Pre-Cancerous Lesions.– HYPERPLASIA - excess proliferation leading to an increase in
number of cells & increase in size of the tissue/organ. Causes, chronic irritation, excess hormones.
– HYPERTROPHY - increase in size of cells & tissue without any increase in number of cells. It is due to increased functional activity of any tissue.
– ATROPHY - simple decrease in size of cells leading to shrinkage of tissues & organs.
– METAPLASIA - change of one type of tissue to another type of different tissue at a place. There may be associated hyperplasia. Usual cause is chronic irritation.
– DYSPLASIA - disordered cellular development leading to abnormal & variable number of cells with change in shape, arrangement & increased mitosis. It is a Pre-malignant condition.
NEOPLASIA
• Neoplastic Growth - abnormal proliferation of cells in a tissue or organ leading to new growth formation.
• Features:– Progression.– Purposeless.– Regardless of surrounding tissue.– Not related to body needs.– Parasitic in nature.
• Classification.– Clinical - (behavior & morbidity) - Benign & Malignant.– Histological - according to origin from type of tissue.
• Epithelia & Glands - (omas & carcinoma)• Mesodermic / Connective tissue – (omas & sarcomas)• Neural Ectoderm – (according to type of neural cells)• Hemopoietic tissue – (myeoldyspalsia & leukemia)• Lymphoid tissue – (lymphoma & lymphosarcoma)
NEOPLASIA
Nomenclature
NEOPLASIA(CLINICAL FEATURES)
FEATURES BENIGN MALIGNANT
Rate of Growth Slow progression Usually rapid progress
Shape ofGrowth
Well demarcatedoften encapsulated
Irregular illdefined &non-capsulated
Relationship tosrrounding
Merely compressnormal tissues
Invade & destroy normaltissues
Spread ofGrowth
Remains locallized Local & distant spreadvia, lymph, blood &serous cavities –METASTASIS.
NEOPLASIA(Classification of Tumor Cells according to their Appearance)
• DIFFERENTIATED
• Similar to their parent of origin
in shape & structure.
• Evidence of normal function.
• Nuclei of same size & shape.
• Infrequent Mitotic figures.
• Signifies a Simple Growth.
• Course & Prognosis is Good
• UNDIFFERENTIATED
• Shape & structure differ from
original cells.
• Abnormal function.
• Abnormal Nuclear
configuration & appearance.
• Abnormal Mitosis.
• Signifies a Malignant Growth.
• Course & Prognosis is Poor.
CARCINOGENESIS
Physical agents.Chemical agents.
Viruses.
Normal Cell Susceptible cell
Mutant cellLoss of identity
Increased mitosis
Co-factorsHereditary & Age
EnvironmentHormonal StatusChronic Irritation
Host reaction successfulRestoration of Normal
cells
Host reaction failurecontinued proliferation
MALIGNANCY
CARCINOGENESIS
Progression of Neoplasia
Progression of Neoplasia
Progression of Neoplasia
Neoplasia Diagnosis
Neoplasia Diagnosis
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