Neoplasm (Solid tumor, 고형종양) is an abnormal growth of tissue, and when also forming a mass is commonly referred to as a tumor or tumour. (http://en.wikipedia.org/wiki/Neoplasm)
Abnormal growth of tissue as a result of Neoplasia.
Table of Contents
Types #
The World Health Organization classifies neoplasms into four main groups
- Benign neoplasms (양성종양)
- arias in any tissue, growth locally, cause damage by local pressure
- do not spread to distant sites
- in situ neoplasms
- usually develop in epithelium
- morphological appearance of cancer cells
- do not invade and destroy
- Malignant neoplasms (=Cancer)
- invade into adjacent normal tissues and metastasize (Metastasis) to distant tissues
- Neoplasms of uncertain or unknown behavior
Divelopment #
- Hyperplasia
- increse in number of cells in response to stimulus (e.g Hormones)
- a reversibel process
- Dysplasia
- an adnormal type of excessive cell proliferation
- loss of normal tissue arragement and cell structure
- Carcinoma in situ
- an uncontrolled growth of cells that remains in the original location
- do not invade
Classification #
- Benign tumors
- are named by attaching the -oma to the name of the tissue or cell
- Malignant tumors
- Carcinoma: the most common types of cancer, epithelial origin (lung, breast, colon, intestine, liver)
- Sarcoma: mesenchymal origin (bone, fat, muscle, blood vessels, or connective tissue)
- Lymphoma: cancer that arias in the lymph nodes and tissues of the body's immune system
- Leukemia: from the immature blood cells that grow in the bone marrow, tend to accumulate in large numbers in the bloodstream
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