A tumor which secretes large amounts of the hormone serotonin. Another name for carcinoid tumor is argentaffinoma. The tumor usually arises in the gastrointestinal tract, anywhere between the stomach and the rectum (the favorite spot is in the appendix) and from there may metastasize (spread) to the liver. In the liver the tumor produces and releas [..]

See: Desmoid tumor.

Benign (noncancerous) bumps on the pinna of the ear (the external ear) or within the external ear canal. Most of these lumps and bumps are just harmless cysts and tumors. However, some of the bumps are bony overgrowths (known as exostoses or osteomas). If they are large and interfere with hearing, they can be surgically removed with comparative eas [..]

See: Islet cell cancer.

A type of bone tumor characterized by massive destruction of bone near the end (epiphysis) of a long bone. The site most commonly struck by this tumor is the knee -- the far end of the femur and the near end of the tibia. The tumor is often coated by new bony growth. It causes pain and restricts movement. Treatment is by surgery, usually followed b [..]

See: Primary tumor.

See: Wilms tumor.

An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancer), or malignant (cancer). Also called neoplasm.

A mass that forms within otherwise normal tissue, caused by the uncontrolled growth of a transformed cell.

necrosis factor (TNF) cachectin cachexin Protein produced by several of the body's cell types, such as white blood cells, red blood cells, and other cells that line the blood vessels; it promotes [..]

progression Sequence of changes by which a benign tumor develops from the initial lesion to a malignant stage.

Also known as: Neoplasm

A mass of tissue with no real function; may be malignant or benign

A growth of abnormal cells that are either malignant or benign.

early 15c., from Latin tumor "swelling, condition of being swollen, a tumor," from tumere "to swell" (see tumid).

An abnormal growth or mass of tissue that may be benign (not cancerous) or malignant (cancerous). 

A mass of excess tissue that results from abnormal cell division. Tumors perform no useful body function. They may be benign (not cancerous) or malignant (cancerous). Back to top --U--

1.) a swelling; a cardinal sign of inflammation

Any swelling or tumefaction.

A spherical mass of cells in which cell divisions occur at random and often in an uncontrolled fashion. tundra

noun. 1. neoplasm. 2. inflammation, one of the cardinal signs of inflammation.

A pathological tissue growth, characterized by uncontrolled multiplication of cells.

an abnormal mass of tissue which may be cancerous or benign

an abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors can be benign or malignant. Benign tumors are not cancer. Malignant tumors are ca [..]

(n) an abnormal new mass of tissue that serves no purpose

Overgrowth of tissue.

A growth (lump or mass) which has formed due to excessive accumulation of abnormal cells. "Tumor" is not a precise medical term. Tumors can be benign (not cancerous) or malignant (c [..]

Any type of swelling or enlargement of tissues; most often used to describe an abnormal growth of tissue, which can be cancerous or noncancerous.

An abnormal overgrowth of cells. Tumors can be either benign or malignant.

An abnormal mass of tissue that results from excessive cell division. Tumors perform no useful body function. They may be either benign (not cancer) or malignant (cancer).

Synonyms: neoplasm, tumour Definition: (TOO-mer) An abnormal mass of tissue that results from excessive cell division (mitotic activity). Tumors perform no useful body function. They may be either ben [..]

An abnormal mass of tissue that results when the growth of cells exceeds,and is uncoordinated with that of the normal tissues around it. Tumors can be benign (not cancerous), or malignant (cancerous). [..]

A mass of cells, generally derived from a single cell, that is not controlled by normal regulators of cell growth.

An abnormal growth of tissue in which cells proliferate more rapidly than in the tissue from which they originated. | ↑ Back to Top

An abnormal mass of tissue that results from excessive cell division that is uncontrolled and progressive. Tumors perform no useful body function. Tumors can be either benign (not cancer) or malignant [..]

A malignant Tumor arising from secreting Cells of a racemose gland, particularly the Salivary Glands. Racemose (Latin racemosus, full of clusters) refers, as does acinar (Latin acinus, grape), to smal [..]

A benign Schwannoma of the Eighth Cranial Nerve (Vestibulocochlear Nerve), mostly arising from the vestibular branch (Vestibular Nerve) during the fifth or sixth decade of Life. Clinical manifestation [..]

A small, circumscribed, benign Tumor of the genital tract, composed of small glandlike spaces lined by flattened or cuboidal mesothelium-like Cells. (From Dorland, 27th ed)

Neoplasm derived from displaced Cells (Rest Cells) of the primordial Adrenal Glands, generally in Patients with Congenital Adrenal Hyperplasia. Adrenal Rest Tumors have been identified in Testes; LIVE [..]

An almost always malignant Glucagon-secreting Tumor derived from the Pancreatic alpha Cells. It is characterized by a distinctive migratory Erythema; Weight Loss; Stomatitis; Glossitis; Diabetes Melli [..]

A benign Tumor of the Pancreatic beta Cells. Insulinoma secretes excess Insulin resulting in Hypoglycemia.

Tumors or cancer of the Urinary Bladder.

Neoplasms composed of vascular Tissue. This concept does not refer to Neoplasms located in Blood Vessels.

Neoplasms of the intracranial components of the Central Nervous System, including the cerebral hemispheres, Basal Ganglia, Hypothalamus, Thalamus, Brain Stem, and Cerebellum. Brain Neoplasms are subdi [..]

Benign and malignant intra-axial Tumors of the Mesencephalon; Pons; or Medulla Oblongata of the Brain Stem. Primary and metastatic Neoplasms may occur in this location. Clinical features include Ataxi [..]

Tumors or cancer of the Human Breast.

A form of undifferentiated Malignant Lymphoma usually found in Central Africa, but also reported in other parts of the world. It is commonly manifested as a large osteolytic lesion in the jaw or as an [..]

Exophytic Tumor of the anogenital region associated with HPV Infections. It becomes a large cauliflower-like, hyperkeratotic, verrucous mass that is locally destructive with little atypical Cells. His [..]

A usually small, slow-growing Neoplasm composed of Islands of rounded, oxyphilic, or spindle-shaped Cells of medium size, with moderately small vesicular nuclei, and covered by intact Mucosa with a ye [..]

Tumors in any part of the Heart. They include primary cardiac Tumors and metastatic Tumors to the Heart. Their interference with normal cardiac functions can cause a wide variety of symptoms including [..]

Benign Paraganglioma at the bifurcation of the Common Carotid Arteries. It can encroach on the parapharyngeal space and produce Dysphagia, Pain, and Cranial Nerve Palsies.

Large benign, hyperplastic Lymph Nodes. The more common Hyaline vascular subtype is characterized by small Hyaline vascular follicles and interfollicular Capillary proliferations. Plasma Cells are oft [..]

Primary or metastatic Neoplasms of the Cerebellum. Tumors in this location frequently present with Ataxia or signs of Intracranial Hypertension due to obstruction of the Fourth Ventricle. Common prima [..]

Neoplasms located in the Brain ventricles, including the two lateral, the third, and the Fourth Ventricle. Ventricular Tumors may be primary (e.g., Choroid Plexus Neoplasms and Glioma, Subependymal), [..]

PEComas of the falciform Ligament / Ligamentum teres.

PEComas containing glycogen-rich clear Cytoplasm and found in the Lung and a wide range of extrapulmonary sites.

Tumors or cancer of the Colon or the Rectum or both. Risk Factors for colorectal cancer include chronic Ulcerative Colitis; Familial Polyposis Coli; exposure to Asbestos; and irradiation of the Cervix [..]

A rare, aggressive Soft Tissue Sarcoma that primarily Affects Adolescents and Young Adults. It is most commonly found in the Abdomen.

A transplantable, poorly differentiated malignant Tumor which appeared originally as a spontaneous Breast Carcinoma in a Mouse. It grows in both solid and ascitic Forms.

Neoplasms of the endometrial stroma that sometimes involve the Myometrium. These Tumors contain Cells that may closely or remotely resemble the normal Stromal Cells. Endometrial stromal Neoplasms are [..]

A malignant Tumor of the bone which always arises in the medullary Tissue, occurring more often in cylindrical bones. The Tumor occurs usually before the age of 20, about twice as frequently in males [..]

A benign Tumor composed of Fat Cells (Adipocytes). It can be surrounded by a thin layer of Connective Tissue (encapsulated), or diffuse without the capsule.

A benign Tumor derived from Smooth Muscle Tissue, also known as a fibroid Tumor. They rarely occur outside of the Uterus and the Gastrointestinal Tract but can occur in the Skin and Subcutaneous Tissu [..]

A GASTRIN-secreting Neuroendocrine Tumor of the non-beta Islet Cells, the Gastrin-Secreting Cells. This type of Tumor is primarily located in the Pancreas or the Duodenum. Majority of gastrinomas are [..]

All Tumors in the Gastrointestinal Tract arising from mesenchymal Cells (Mesoderm) except those of Smooth Muscle Cells (Leiomyoma) or Schwann Cells (Schwannoma).

Tumors of bone Tissue or synovial or other soft Tissue characterized by the presence of Giant Cells. The most common are Giant Cell Tumor of Tendon sheath and Giant Cell Tumor of Bone.

Benign and malignant Central Nervous System Neoplasms derived from Glial Cells (i.e., Astrocytes, Oligodendrocytes, and ependymocytes). Astrocytes may give rise to Astrocytomas (Astrocytoma) or Gliobl [..]

A blue-red, extremely painful Vascular Neoplasm involving a glomeriform Arteriovenous Anastomosis (glomus body), which may be found anywhere in the Skin, most often in the distal portion of the finger [..]

A Paraganglioma involving the Glomus Jugulare, a microscopic collection of chemoreceptor Tissue in the Adventitia of the bulb of the Jugular Vein. It may cause Paralysis of the Vocal Cords, attacks of [..]

A rare Paraganglioma involving the Glomus Tympanicum, a collection of chemoreceptor Tissue adjacent to the TYMPANIC CAVITY. It can cause Tinnitus and Conductive Hearing Loss (Hearing Loss, Conductive) [..]

Unusual Tumor affecting any site of the body, but most often encountered in the head and neck. Considerable debate has surrounded the histogenesis of this Neoplasm; however, it is considered to be a m [..]

A Neoplasm composed entirely of Granulosa Cells, occurring mostly in the Ovary. In the Adult form, it may contain some Theca Cells. This Tumor often produces Estradiol and Inhibin. The excess Estrogen [..]

Benign and malignant Tumors of the Hypothalamus. Pilocytic Astrocytomas and Hamartomas are relatively frequent histologic types. Neoplasms of the Hypothalamus frequently originate from adjacent struct [..]

Adenocarcinoma of the Common Hepatic Duct bifurcation. These Tumors are generally small, sharply localized, and seldom metastasizing. G. Klatskin's original Review of 13 cases was published in 19 [..]

Mucocellular Carcinoma of the Ovary, usually metastatic from the Gastrointestinal Tract, characterized by areas of mucoid degeneration and the presence of signet-ring-like Cells. It accounts for 30%-4 [..]

Gonadal interstitial or Stromal Cell Neoplasm composed of only Leydig Cells. These Tumors may produce one or more of the steroid Hormones such as Androgens; Estrogens; and CORTICOSTEROIDS. Clinical sy [..]

Neoplasms composed of Lymphoid Tissue, a lattice Work of reticular Tissue the interspaces of which contain Lymphocytes. The concept does not refer to Neoplasms located in Lymphatic Vessels.

Any Neoplasms of the male Breast. These occur infrequently in males in Developed Countries, the Incidence being about 1% of that in females.

A malignant Neoplasm made up of Epithelial Cells tending to infiltrate the surrounding Tissues and give rise to Metastases. It is a Histological Type of Neoplasm but is often wrongly used as a synonym [..]

The most commonly diagnosed Soft Tissue Sarcoma. It is a Neoplasm with a fibrohistiocytic appearance found chiefly in later Adult Life, with peak Incidence in the 7th decade.

A malignant Tumor composed of more than one type of neoplastic Tissue. (Dorland, 27th ed)

Benign and malignant Neoplastic Processes that arise from or secondarily involve the meningeal coverings of the Brain and spinal cord.

A Carcinoma arising from Merkel Cells located in the basal layer of the Epidermis and occurring most commonly as a primary Neuroendocrine Carcinoma of the Skin. Merkel Cells are tactile Cells of neuro [..]

A Sarcoma of the body of the Uterus arising in older Women, composed of more than one mesenchymal Tissue, especially including Striated Muscle Cells. It is associated with previous pelvic Radiation ex [..]

A Malignant Epithelial Tumor of glandular Tissue, especially the Salivary Glands, characterized by acini with Mucus-producing Cells and by the presence of malignant squamous Elements. Most mucoepiderm [..]

A Tumor, basically a Carcinoma with a single Sarcoma such as Leiomyosarcoma or Angiosarcoma or multiple Sarcomas of uterine origin. The Role of Estrogen has been postulated as a possible etiological f [..]

A usually benign Tumor made up predominantly of myoepithelial Cells.

Benign and malignant Neoplastic Processes arising from or involving components of the central, peripheral, and Autonomic Nervous Systems, Cranial Nerves, and Meninges. Included in this category are pr [..]

Malignant Neoplasms arising in the neuroEctoderm, the portion of the Ectoderm of the early Embryo that gives rise to the central and Peripheral Nervous Systems, including some Glial Cells.

Tumors whose Cells possess Secretory Granules and originate from the neuroectoderm, i.e., the Cells of the ectoblast or Epiblast that program the Neuroendocrine System. Common properties across most n [..]

Neoplasms composed of Neuroepithelial Cells, which have the capacity to differentiate into Neurons, Oligodendrocytes, and Astrocytes. The majority of craniospinal Tumors are of neuroepithelial origin. [..]

Neoplasms produced from Tooth-forming Tissues.

A Sarcoma originating in bone-forming Cells, affecting the ends of long bones. It is the most common and most malignant of Sarcomas of the bones, and occurs chiefly among 10- to 25-year-old youths. (F [..]

A Lung Tumor located in the superior pulmonary sulcus.

Neoplasms which arise from Peripheral Nerve Tissue. This includes Neurofibromas; Schwannomas; Granular Cell Tumors; and malignant peripheral Nerve Sheath Neoplasms. (From DeVita Jr et al., Cancer: Pri [..]

A group of highly Cellular primitive round Cell Neoplasms which occur extracranially in soft Tissue and bone and are derived from embryonal Neural Crest Cells. These Tumors occur primarily in Children [..]

A type of Connective Tissue Neoplasm typically arising from intralobular stroma of the Breast. It is characterized by the rapid enlargement of an asymmetric firm mobile mass. Histologically, its leaf- [..]

Neoplasms which originate from pineal parenchymal Cells that tend to enlarge the gland and be locally invasive. The two major Forms are pineocytoma and the more malignant pineoblastoma. Pineocytomas h [..]

Neoplasms which arise from or metastasize to the Pituitary Gland. The majority of pituitary Neoplasms are Adenomas, which are divided into non-secreting and secreting Forms. Hormone producing Forms ar [..]

An uncommon variant of Choriocarcinoma. It is composed almost entirely of mononuclear Cytotrophoblasts (Trophoblasts). Because its Secretion of hCG (Chorionic Gonadotropin) is low, a large Tumor may d [..]

A localized proliferation of Plant Tissue forming a swelling or outgrowth, commonly with a characteristic shape and unlike any organ of the normal Plant. Plant Tumors or galls usually form in response [..]

Any discrete, presumably solitary, mass of neoplastic Plasma Cells either in Bone Marrow or various extramedullary sites.

Intracranial Tumors originating in the region of the Brain inferior to the tentorium cerebelli, which contains the Cerebellum, Fourth Ventricle, Cerebellopontine Angle, Brain Stem, and related structu [..]

Infection of the Frontal Bone often as a complication of Frontal Sinusitis or Trauma to the Frontal Bone and Skull. It is characterized by subperiosteal Abscess with OSTEOMYELITIS.

A group of malignant Tumors of the Nervous System that feature primitive Cells with Elements of neuronal and/or glial differentiation. Use of this term is limited by some authors to Central Nervous Sy [..]

A benign pituitary-region Neoplasm that originates from Rathke's pouch. The two major histologic and clinical subtypes are adamantinous (or classical) craniopharyngioma and papillary craniopharyn [..]

Tumors or cancer of the Retina.

A benign, rapidly growing, deeply pigmented Tumor of the jaw and occasionally of other sites, consisting of an infiltrating mass of Cells arranged in an alveolar pattern, and occurring almost exclusiv [..]

A rare but highly lethal childhood Tumor found almost exclusively in Infants. Histopathologically, it resembles Rhabdomyosarcoma but the Tumor Cells are not of myogenic origin. Although it arises prim [..]

Gonadal Neoplasm composed entirely of Sertoli Cells or may have a component of Granulosa Cells. Some of the Sertoli Cell Tumors produce Estrogen or Androgens, but seldom in sufficient quantity to caus [..]

A sex cord-gonadal stromal Tumor consists of Leydig Cells; Sertoli Cells; and Fibroblasts in varying proportions and degree of differentiation. Most such Tumors produce Androgens in the Leydig Cells, [..]

Neoplasms derived from the primitive sex cord or gonadal Stromal Cells of the embryonic Gonads. They are classified by their presumed histogenesis and differentiation. From the sex cord, there are Ser [..]

A Tumor composed of Smooth Muscle Tissue, as opposed to Leiomyoma, a Tumor derived from Smooth Muscle.

Rare Neoplasms of mesenchymal origin, usually benign, and most commonly involving the Pleura (see Solitary Fibrous Tumor, Pleural). They also are found in extraPleural sites.

Benign and malignant Neoplasms which occur within the substance of the spinal cord (intramedullary Neoplasms) or in the space between the dura and spinal cord (intradural extramedullary Neoplasms). Th [..]

A well-differentiated, benign, hamartomatous proliferation of odontogenic Epithelium, probably arising from the Rests of Malassez.

Primary and metastatic (secondary) Tumors of the Brain located above the tentorium cerebelli, a fold of Dura Mater separating the Cerebellum and Brain Stem from the cerebral hemispheres and Diencephal [..]

A true Neoplasm composed of a number of different types of Tissue, none of which is native to the area in which it occurs. It is composed of Tissues that are derived from three germinal layers, the En [..]

A gonadal stromal Neoplasm composed only of Theca Cells, occurring mostly in the postmenopausal Ovary. It is filled with lipid-containing spindle Cells and produces Estrogens that can Lead to Endometr [..]

Tumors or cancer of the Thymus Gland.

Trophoblastic Growth, which may be gestational or nongestational in origin. Trophoblastic Neoplasia resulting from Pregnancy is often described as Gestational Trophoblastic Disease to distinguish it f [..]

Tumors most commonly seen on or near the Genitalia. They are venereal, most likely transmitted through Transplantation of Cells by contact. Metastases have been reported. Spontaneous Regression may oc [..]

A Tumor that secretes Vasoactive Intestinal Peptide, a Neuropeptide that causes Vasodilation; Relaxation of Smooth Muscles; watery Diarrhea; Hypokalemia; and HYPOCHLORHYDRIA. Vipomas, derived from the [..]

A benign Tumor characterized histologically by tall columnar Epithelium within a Lymphoid Tissue stroma. It is usually found in the Salivary Glands, especially the parotid.

A malignant Kidney Tumor, caused by the uncontrolled multiplication of renal STEM (blaSTEMal), stromal (Stromal Cells), and epithelial (Epithelial Cells) Elements. However, not all three are present i [..]

An unusual and aggressive Tumor of germ-Cell origin that reproduces the extraEmbryonic structures of the early Embryo. It is the most common malignant Germ Cell Tumor found in Children. It is characte [..]

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.

An abnormal growth or swelling, frequently used to denote a cancerous growth.

An abnormal, usually well defined, mass of tissue within an animal; can be either malignant (cancerous) or benign.

a mass or growth. A tumor can be benign or malignant; a “fatty tumor” (lipoma) is one common example of a benign tumor.

An abnormal overgrowth of cells, either benign or malignant.

An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancer), or malignant (cancer). Also called neoplasm. (NCI)

An abnormal lump or mass of tissue (a layer of cells). A tumor forms when cells divide more than they should or do not die when they should. Tumors can be benign (not cancer) or malignant (cancer).

a new growth of tissue in which cell multiplication is uncontrolled and progressive.

An abnormal mass of tissue that results from excessive cell division. Tumors perform no useful body function. They may be benign (not cancerous) or malignant (cancerous).

suppressor gene: A member of a category of genes that are thought to be active during embryonic development. These genes have normal functions during embryonic stages that are suppressed when development is complete. If these functions are somehow reactivated during adult life, uncontrolled growth can result. This growth can sometimes lead to the d [..]

A growth consisting of differentiated cancer cells.

A large, obvious weak spot in a vehicles armor that serves no functional purpose and is only a hindrance. Many cupolas and sponsons on various tanks are considered tumors.

 Abnormal growth of tissue or cells that have formed a lump or mass.

A benign or malignant tissue growth resulting from uncontrolled cell proliferation. Benign neoplastic cells resemble normal cells without exhibiting significant cytologic atypia, while malignant cells exhibit overt signs such as dysplastic features, atypical mitotic figures, necrosis, nuclear pleomorphism, and anaplasia. Representative examples of [..]

An abnormal growth of cells or tissues. Tumors may be benign (noncancerous) or malignant (cancerous). Valves

Lump or abnormal growth, which may be benign or malignant.

An abnormal mass of tissue that results from excessive cell division. Tumors perform no useful body function. They may either be benign or malignant. Tumor marker

 An abnormal growth of cells or tissues. Tumors may be benign (noncancerous) or malignant (cancerous).

An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancer), or malignant (cancer). Also called neoplasm.