Canadian Medical Guide > Diseases > Neoplasms Terms and Definitions

Neoplasms

Medical Definition:	New abnormal growth of tissue. Malignant neoplasms show a greater degree of anaplasia and have the properties of invasion and metastasis, compared to benign neoplasms.
Guide Notes:	avoid: too general; prefer specifics; policy: Manual section 24; /chem ind permitted but consider also CARCINOGENS; /class: consider also NEOPLASM STAGING (see note there) but "grading" = /pathol; /etiol: consider also ONCOGENIC VIRUSES; /vet: Manual 24.6
Also Called:	Benign Neoplasms,Cancer

Neoplasms Categories.

	Cysts - Any fluid-filled closed cavity or sac that is lined by an EPITHELIUM. Cysts can be of normal, abnormal, non-neoplastic, or neoplastic tissues.
	Hamartoma - A focal malformation resembling a neoplasm, composed of an overgrowth of mature cells and tissues that normally occur in the affected area.
	Neoplasms by Histologic Type - A collective term for the various histological types of NEOPLASMS. It is more likely to be used by searchers than by indexers and catalogers.
	Neoplasms by Site - A collective term for precoordinated organ/neoplasm headings locating neoplasms by organ, as BRAIN NEOPLASMS; DUODENAL NEOPLASMS; LIVER NEOPLASMS; etc.
	Neoplasms, Experimental
	Neoplasms, Hormone-Dependent - Certain tumors that 1) arise in organs that are normally dependent on specific hormones and 2) are stimulated or caused to regress by manipulation of the endocrine environment.
	Neoplasms, Multiple Primary - Two or more abnormal growths of tissue occurring simultaneously. The neoplasms are histologically different and may be found in the same or different sites.
	Neoplasms, Post-Traumatic - Tumors, cancer or other neoplasms caused by or resulting from trauma or other non-radiation injuries.
	Neoplasms, Radiation-Induced - Tumors, cancer or other neoplasms produced by exposure to ionizing or non-ionizing radiation.
	Neoplasms, Second Primary - Abnormal growths of tissue that follow a previous neoplasm but are not metastases of the latter. The second neoplasm may have the same or different histological type and can occur in the same or different organs as the previous neoplasm but in all cases arises from an independent oncogenic event. The development of the second neoplasm may or may not be related to the treatment for the previous neoplasm since genetic risk or predisposing factors may actually be the cause.
	Neoplastic Processes - The pathological mechanisms and forms taken by tissue during degeneration into a neoplasm and its subsequent activity.
	Neoplastic Syndromes, Hereditary - The condition of a pattern of malignancies within a family, but not every individual's necessarily having the same neoplasm. Characteristically the tumor tends to occur at an earlier than average age, individuals may have more than one primary tumor, the tumors may be multicentric, usually more than 25 percent of the individuals in direct lineal descent from the proband are affected, and the cancer predisposition in these families behaves as an autosomal dominant trait with about 60 percent penetrance.
	Paraneoplastic Syndromes - In patients with neoplastic diseases a wide variety of clinical pictures which are indirect and usually remote effects produced by tumor cell metabolites or other products.
	Precancerous Conditions - Pathological processes that tend eventually to become malignant. (From Dorland, 27th ed)
	Pregnancy Complications, Neoplastic - Neoplasms occurring during the course of pregnancy, or pregnancy during the course of a neoplastic disease.

Neoplasms Medical Definitions and Terms

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