Tumor
"Tumor" References in the ICD-10-CM Index to Diseases and Injuries
References in the ICD-10-CM Index to Diseases and Injuries applicable to the clinical term "tumor"
- Tumor - See Also: Neoplasm, unspecified behavior, by site;
- acinar cell - See: Neoplasm, uncertain behavior, by site;
- acinic cell - See: Neoplasm, uncertain behavior, by site;
- adenocarcinoid - See: Neoplasm, malignant, by site;
- adenomatoid - See Also: Neoplasm, benign, by site;
- odontogenic - See: Cyst, calcifying odontogenic;
- adnexal (skin) - See: Neoplasm, skin, benign, by site;
- adrenal
- alpha-cell
- aneurysmal - See: Aneurysm;
- aortic body - D44.7 Neoplasm of uncertain behavior of aortic body and other paraganglia
- malignant - C75.5 Malignant neoplasm of aortic body and other paraganglia
- Askin's - See: Neoplasm, connective tissue, malignant;
- basal cell - See Also: Neoplasm, skin, uncertain behavior; - D48.5 Neoplasm of uncertain behavior of skin
- Bednar - See: Neoplasm, skin, malignant;
- benign (unclassified) - See: Neoplasm, benign, by site;
- beta-cell
- Brenner - D27.9 Benign neoplasm of unspecified ovary
- bronchial alveolar, intravascular - D38.1 Neoplasm of uncertain behavior of trachea, bronchus and lung
- Brooke's - See: Neoplasm, skin, benign;
- brown fat - See: Lipoma;
- Burkitt - See: Lymphoma, Burkitt;
- calcifying epithelial odontogenic - See: Cyst, calcifying odontogenic;
- carcinoid - D3A.00 Benign carcinoid tumor of unspecified site
- benign - D3A.00 Benign carcinoid tumor of unspecified site
- appendix - D3A.020 Benign carcinoid tumor of the appendix
- ascending colon - D3A.022 Benign carcinoid tumor of the ascending colon
- bronchus (lung) - D3A.090 Benign carcinoid tumor of the bronchus and lung
- cecum - D3A.021 Benign carcinoid tumor of the cecum
- colon - D3A.029 Benign carcinoid tumor of the large intestine, unspecified portion
- descending colon - D3A.024 Benign carcinoid tumor of the descending colon
- duodenum - D3A.010 Benign carcinoid tumor of the duodenum
- foregut NOS - D3A.094 Benign carcinoid tumor of the foregut, unspecified
- hindgut NOS - D3A.096 Benign carcinoid tumor of the hindgut, unspecified
- ileum - D3A.012 Benign carcinoid tumor of the ileum
- jejunum - D3A.011 Benign carcinoid tumor of the jejunum
- kidney - D3A.093 Benign carcinoid tumor of the kidney
- large intestine - D3A.029 Benign carcinoid tumor of the large intestine, unspecified portion
- lung (bronchus) - D3A.090 Benign carcinoid tumor of the bronchus and lung
- midgut NOS - D3A.095 Benign carcinoid tumor of the midgut, unspecified
- rectum - D3A.026 Benign carcinoid tumor of the rectum
- sigmoid colon - D3A.025 Benign carcinoid tumor of the sigmoid colon
- small intestine - D3A.019 Benign carcinoid tumor of the small intestine, unspecified portion
- specified NEC - D3A.098 Benign carcinoid tumors of other sites
- stomach - D3A.092 Benign carcinoid tumor of the stomach
- thymus - D3A.091 Benign carcinoid tumor of the thymus
- transverse colon - D3A.023 Benign carcinoid tumor of the transverse colon
- malignant - C7A.00 Malignant carcinoid tumor of unspecified site
- appendix - C7A.020 Malignant carcinoid tumor of the appendix
- ascending colon - C7A.022 Malignant carcinoid tumor of the ascending colon
- bronchus (lung) - C7A.090 Malignant carcinoid tumor of the bronchus and lung
- cecum - C7A.021 Malignant carcinoid tumor of the cecum
- colon - C7A.029 Malignant carcinoid tumor of the large intestine, unspecified portion
- descending colon - C7A.024 Malignant carcinoid tumor of the descending colon
- duodenum - C7A.010 Malignant carcinoid tumor of the duodenum
- foregut NOS - C7A.094 Malignant carcinoid tumor of the foregut, unspecified
- hindgut NOS - C7A.096 Malignant carcinoid tumor of the hindgut, unspecified
- ileum - C7A.012 Malignant carcinoid tumor of the ileum
- jejunum - C7A.011 Malignant carcinoid tumor of the jejunum
- kidney - C7A.093 Malignant carcinoid tumor of the kidney
- large intestine - C7A.029 Malignant carcinoid tumor of the large intestine, unspecified portion
- lung (bronchus) - C7A.090 Malignant carcinoid tumor of the bronchus and lung
- midgut NOS - C7A.095 Malignant carcinoid tumor of the midgut, unspecified
- rectum - C7A.026 Malignant carcinoid tumor of the rectum
- sigmoid colon - C7A.025 Malignant carcinoid tumor of the sigmoid colon
- small intestine - C7A.019 Malignant carcinoid tumor of the small intestine, unspecified portion
- specified NEC - C7A.098 Malignant carcinoid tumors of other sites
- stomach - C7A.092 Malignant carcinoid tumor of the stomach
- thymus - C7A.091 Malignant carcinoid tumor of the thymus
- transverse colon - C7A.023 Malignant carcinoid tumor of the transverse colon
- mesentary metastasis - C7B.04 Secondary carcinoid tumors of peritoneum
- secondary - C7B.00 Secondary carcinoid tumors, unspecified site
- bone - C7B.03 Secondary carcinoid tumors of bone
- distant lymph nodes - C7B.01 Secondary carcinoid tumors of distant lymph nodes
- liver - C7B.02 Secondary carcinoid tumors of liver
- peritoneum - C7B.04 Secondary carcinoid tumors of peritoneum
- specified NEC - C7B.09 Secondary carcinoid tumors of other sites
- benign - D3A.00 Benign carcinoid tumor of unspecified site
- carotid body - D44.6 Neoplasm of uncertain behavior of carotid body
- malignant - C75.4 Malignant neoplasm of carotid body
- cells - See Also: Neoplasm, unspecified behavior, by site;
- benign - See: Neoplasm, benign, by site;
- malignant - See: Neoplasm, malignant, by site;
- uncertain whether benign or malignant - See: Neoplasm, uncertain behavior, by site;
- cervix, in pregnancy or childbirth - See: Pregnancy, complicated by, tumor, cervix;
- chondromatous giant cell - See: Neoplasm, bone, benign;
- chromaffin - See Also: Neoplasm, benign, by site;
- malignant - See: Neoplasm, malignant, by site;
- Cock's peculiar - L72.3 Sebaceous cyst
- Codman's - See: Neoplasm, bone, benign;
- dentigerous, mixed - See: Cyst, calcifying odontogenic;
- dermoid - See: Neoplasm, benign, by site;
- with malignant transformation - C56 Malignant neoplasm of ovary
- desmoid (extra-abdominal) - See Also: Neoplasm, connective tissue, uncertain behavior;
- abdominal - See: Neoplasm, connective tissue, uncertain behavior;
- embolus - See: Neoplasm, secondary, by site;
- embryonal (mixed) - See Also: Neoplasm, uncertain behavior, by site;
- liver - C22.7 Other specified carcinomas of liver
- endodermal sinus
- epithelial
- benign - See: Neoplasm, benign, by site;
- malignant - See: Neoplasm, malignant, by site;
- Ewing's - See: Neoplasm, bone, malignant, by site;
- fatty - See: Lipoma;
- fibroid - See: Leiomyoma;
- G cell
- malignant
- specified site - See: Neoplasm, uncertain behavior, by site;
- unspecified site - D37.8 Neoplasm of uncertain behavior of other specified digestive organs
- germ cell - See Also: Neoplasm, malignant, by site;
- mixed - See: Neoplasm, malignant, by site;
- ghost cell, odontogenic - See: Cyst, calcifying odontogenic;
- giant cell - See Also: Neoplasm, uncertain behavior, by site;
- bone - D48.0 Neoplasm of uncertain behavior of bone and articular cartilage
- malignant - See: Neoplasm, bone, malignant;
- chondromatous - See: Neoplasm, bone, benign;
- malignant - See: Neoplasm, malignant, by site;
- soft parts - See: Neoplasm, connective tissue, uncertain behavior;
- malignant - See: Neoplasm, connective tissue, malignant;
- bone - D48.0 Neoplasm of uncertain behavior of bone and articular cartilage
- glomus - D18.00 Hemangioma unspecified site
- intra-abdominal - D18.03 Hemangioma of intra-abdominal structures
- intracranial - D18.02 Hemangioma of intracranial structures
- jugulare - D44.7 Neoplasm of uncertain behavior of aortic body and other paraganglia
- malignant - C75.5 Malignant neoplasm of aortic body and other paraganglia
- skin - D18.01 Hemangioma of skin and subcutaneous tissue
- specified site NEC - D18.09 Hemangioma of other sites
- gonadal stromal - See: Neoplasm, uncertain behavior, by site;
- granular cell - See Also: Neoplasm, connective tissue, benign;
- malignant - See: Neoplasm, connective tissue, malignant;
- granulosa cell - D39.1 Neoplasm of uncertain behavior of ovary
- granulosa cell-theca cell - D39.1 Neoplasm of uncertain behavior of ovary
- malignant - C56 Malignant neoplasm of ovary
- Grawitz's - C64 Malignant neoplasm of kidney, except renal pelvis
- hemorrhoidal - See: Hemorrhoids;
- hilar cell - D27 Benign neoplasm of ovary
- hilus cell - D27 Benign neoplasm of ovary
- Hurthle cell (benign) - D34 Benign neoplasm of thyroid gland
- malignant - C73 Malignant neoplasm of thyroid gland
- hydatid - See: Echinococcus;
- hypernephroid - See Also: Neoplasm, uncertain behavior, by site;
- interstitial cell - See Also: Neoplasm, uncertain behavior, by site;
- benign - See: Neoplasm, benign, by site;
- malignant - See: Neoplasm, malignant, by site;
- intravascular bronchial alveolar - D38.1 Neoplasm of uncertain behavior of trachea, bronchus and lung
- islet cell - See: Neoplasm, benign, by site;
- juxtaglomerular - D41.0 Neoplasm of uncertain behavior of kidney
- Klatskin's - C24.0 Malignant neoplasm of extrahepatic bile duct
- Krukenberg's - C79.6 Secondary malignant neoplasm of ovary
- Leydig cell - See: Neoplasm, uncertain behavior, by site;
- benign - See: Neoplasm, benign, by site;
- malignant - See: Neoplasm, malignant, by site;
- specified site - See: Neoplasm, uncertain behavior, by site;
- unspecified site
- lipid cell, ovary - D27 Benign neoplasm of ovary
- lipoid cell, ovary - D27 Benign neoplasm of ovary
- malignant - See Also: Neoplasm, malignant, by site; - C80.1 Malignant (primary) neoplasm, unspecified
- fusiform cell (type) - C80.1 Malignant (primary) neoplasm, unspecified
- giant cell (type) - C80.1 Malignant (primary) neoplasm, unspecified
- localized, plasma cell - See: Plasmacytoma, solitary;
- mixed NEC - C80.1 Malignant (primary) neoplasm, unspecified
- small cell (type) - C80.1 Malignant (primary) neoplasm, unspecified
- spindle cell (type) - C80.1 Malignant (primary) neoplasm, unspecified
- unclassified - C80.1 Malignant (primary) neoplasm, unspecified
- mast cell - D47.09 Other mast cell neoplasms of uncertain behavior
- melanotic, neuroectodermal - See: Neoplasm, benign, by site;
- Merkel cell - See: Carcinoma, Merkel cell;
- mesenchymal
- malignant - See: Neoplasm, connective tissue, malignant;
- mixed - See: Neoplasm, connective tissue, uncertain behavior;
- mesodermal, mixed - See Also: Neoplasm, malignant, by site;
- liver - C22.4 Other sarcomas of liver
- mesonephric - See Also: Neoplasm, uncertain behavior, by site;
- malignant - See: Neoplasm, malignant, by site;
- metastatic
- from specified site - See: Neoplasm, malignant, by site;
- of specified site - See: Neoplasm, malignant, by site;
- to specified site - See: Neoplasm, secondary, by site;
- mixed NEC - See Also: Neoplasm, benign, by site;
- malignant - See: Neoplasm, malignant, by site;
- mucinous of low malignant potential
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C56.9 Malignant neoplasm of unspecified ovary
- mucocarcinoid
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C18.1 Malignant neoplasm of appendix
- mucoepidermoid - See: Neoplasm, uncertain behavior, by site;
- Müllerian, mixed
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C54.9 Malignant neoplasm of corpus uteri, unspecified
- myoepithelial - See: Neoplasm, benign, by site;
- neuroectodermal (peripheral) - See: Neoplasm, malignant, by site;
- primitive
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C71.9 Malignant neoplasm of brain, unspecified
- primitive
- neuroendocrine - D3A.8 Other benign neuroendocrine tumors
- neurogenic olfactory - C30.0 Malignant neoplasm of nasal cavity
- nonencapsulated sclerosing - C73 Malignant neoplasm of thyroid gland
- odontogenic (adenomatoid) (benign) (calcifying epithelial) (keratocystic) (squamous) - See: Cyst, calcifying odontogenic;
- ovarian stromal - D39.1 Neoplasm of uncertain behavior of ovary
- ovary, in pregnancy - See: Pregnancy, complicated by;
- pacinian - See: Neoplasm, skin, benign;
- Pancoast's - See: Pancoast's syndrome;
- papillary - See Also: Papilloma;
- cystic - D37.9 Neoplasm of uncertain behavior of digestive organ, unspecified
- mucinous of low malignant potential - C56 Malignant neoplasm of ovary
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C56.9 Malignant neoplasm of unspecified ovary
- serous of low malignant potential
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C56.9 Malignant neoplasm of unspecified ovary
- pelvic, in pregnancy or childbirth - See: Pregnancy, complicated by;
- phantom - F45.8 Other somatoform disorders
- phyllodes - D48.6 Neoplasm of uncertain behavior of breast
- benign - D24 Benign neoplasm of breast
- malignant - See: Neoplasm, breast, malignant;
- Pindborg - See: Cyst, calcifying odontogenic;
- placental site trophoblastic - D39.2 Neoplasm of uncertain behavior of placenta
- plasma cell (malignant) (localized) - See: Plasmacytoma, solitary;
- polyvesicular vitelline
- Pott's puffy - See: Osteomyelitis, specified NEC;
- Rathke's pouch - D44.3 Neoplasm of uncertain behavior of pituitary gland
- retinal anlage - See: Neoplasm, benign, by site;
- salivary gland type, mixed - See: Neoplasm, salivary gland, benign;
- malignant - See: Neoplasm, salivary gland, malignant;
- Sampson's - N80.1 Endometriosis of ovary
- Schmincke's - See: Neoplasm, nasopharynx, malignant;
- sclerosing stromal - D27 Benign neoplasm of ovary
- sebaceous - See: Cyst, sebaceous;
- secondary - See: Neoplasm, secondary, by site;
- carcinoid - C7B.00 Secondary carcinoid tumors, unspecified site
- bone - C7B.03 Secondary carcinoid tumors of bone
- distant lymph nodes - C7B.01 Secondary carcinoid tumors of distant lymph nodes
- liver - C7B.02 Secondary carcinoid tumors of liver
- peritoneum - C7B.04 Secondary carcinoid tumors of peritoneum
- specified NEC - C7B.09 Secondary carcinoid tumors of other sites
- neuroendocrine NEC - C7B.8 Other secondary neuroendocrine tumors
- carcinoid - C7B.00 Secondary carcinoid tumors, unspecified site
- serous of low malignant potential
- specified site - See: Neoplasm, malignant, by site;
- unspecified site - C56.9 Malignant neoplasm of unspecified ovary
- Sertoli cell - See: Neoplasm, benign, by site;
- specified site - See: Neoplasm, benign, by site;
- unspecified site
- with lipid storage
- Sertoli-Leydig cell - See: Neoplasm, benign, by site;
- sex cord (-stromal) - See: Neoplasm, uncertain behavior, by site;
- with annular tubules - D39.1 Neoplasm of uncertain behavior of ovary
- skin appendage - See: Neoplasm, skin, benign;
- smooth muscle - See: Neoplasm, connective tissue, uncertain behavior;
- soft tissue
- benign - See: Neoplasm, connective tissue, benign;
- malignant - See: Neoplasm, connective tissue, malignant;
- sternomastoid (congenital) - Q68.0 Congenital deformity of sternocleidomastoid muscle
- stromal
- endometrial - D39.0 Neoplasm of uncertain behavior of uterus
- gastric - D48.1 Neoplasm of uncertain behavior of connective and other soft tissue
- gastrointestinal - C49.A Gastrointestinal stromal tumor
- benign - D21.4 Benign neoplasm of connective and other soft tissue of abdomen
- esophagus - C49.A1 Gastrointestinal stromal tumor of esophagus
- large intestine - C49.A4 Gastrointestinal stromal tumor of large intestine
- malignant - C49.A0 Gastrointestinal stromal tumor, unspecified site
- colon - C49.A4 Gastrointestinal stromal tumor of large intestine
- duodenum - C49.A3 Gastrointestinal stromal tumor of small intestine
- esophagus - C49.A1 Gastrointestinal stromal tumor of esophagus
- ileum - C49.A3 Gastrointestinal stromal tumor of small intestine
- jejunum - C49.A3 Gastrointestinal stromal tumor of small intestine
- large intestine - C49.A4 Gastrointestinal stromal tumor of large intestine
- Meckel diverticulum - C49.A3 Gastrointestinal stromal tumor of small intestine
- omentum - C49.A9 Gastrointestinal stromal tumor of other sites
- peritoneum - C49.A9 Gastrointestinal stromal tumor of other sites
- rectum - C49.A5 Gastrointestinal stromal tumor of rectum
- small intestine - C49.A3 Gastrointestinal stromal tumor of small intestine
- specified site NEC - C49.A9 Gastrointestinal stromal tumor of other sites
- stomach - C49.A2 Gastrointestinal stromal tumor of stomach
- rectum - C49.A5 Gastrointestinal stromal tumor of rectum
- small intestine - C49.A3 Gastrointestinal stromal tumor of small intestine
- specified site NEC - C49.A9 Gastrointestinal stromal tumor of other sites
- stomach - C49.A2 Gastrointestinal stromal tumor of stomach
- uncertain behavior - D48.1 Neoplasm of uncertain behavior of connective and other soft tissue
- intestine
- ovarian - D39.1 Neoplasm of uncertain behavior of ovary
- stomach - C49.A2 Gastrointestinal stromal tumor of stomach
- sweat gland - See Also: Neoplasm, skin, uncertain behavior;
- benign - See: Neoplasm, skin, benign;
- malignant - See: Neoplasm, skin, malignant;
- syphilitic, brain - A52.17 General paresis
- testicular - D40.10 Neoplasm of uncertain behavior of unspecified testis
- testicular stromal - D40.1 Neoplasm of uncertain behavior of testis
- theca cell - D27.
- theca cell-granulosa cell - D39.1 Neoplasm of uncertain behavior of ovary
- Triton, malignant - See: Neoplasm, nerve, malignant;
- trophoblastic, placental site - D39.2 Neoplasm of uncertain behavior of placenta
- turban - D23.4 Other benign neoplasm of skin of scalp and neck
- uterus (body), in pregnancy or childbirth - See: Pregnancy, complicated by, tumor, uterus;
- vagina, in pregnancy or childbirth - See: Pregnancy, complicated by;
- varicose - See: Varix;
- von Recklinghausen's - See: Neurofibromatosis;
- vulva or perineum, in pregnancy or childbirth - See: Pregnancy, complicated by;
- causing obstructed labor - O65.5 Obstructed labor due to abnormality of maternal pelvic organs
- Warthin's - See: Neoplasm, salivary gland, benign;
- Wilms' - C64 Malignant neoplasm of kidney, except renal pelvis
- yolk sac - See: Neoplasm, malignant, by site;
Applicable Clinical Terms Definitions
Acinar Cells: Cells lining the saclike dilatations known as acini of various glands or the lungs.
Appendix: A worm-like blind tube extension from the CECUM.
Colon, Ascending: The segment of LARGE INTESTINE between the CECUM and the TRANSVERSE COLON. It passes cephalad from the cecum to the caudal surface of the right lobe of the LIVER where it bends sharply to the left, forming the right colic flexure.
Bone and Bones: A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principal cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX.
Carotid Body: A small cluster of chemoreceptive and supporting cells located near the bifurcation of the internal carotid artery. The carotid body, which is richly supplied with fenestrated capillaries, senses the pH, carbon dioxide, and oxygen concentrations in the blood and plays a crucial role in their homeostatic control.
Cecum: The blind sac or outpouching area of the LARGE INTESTINE that is below the entrance of the SMALL INTESTINE. It has a worm-like extension, the vermiform APPENDIX.
Cells: The fundamental, structural, and functional units or subunits of living organisms. They are composed of CYTOPLASM containing various ORGANELLES and a CELL MEMBRANE boundary.
Colon: The segment of LARGE INTESTINE between the CECUM and the RECTUM. It includes the ASCENDING COLON; the TRANSVERSE COLON; the DESCENDING COLON; and the SIGMOID COLON.
Colon, Descending: The segment of LARGE INTESTINE between TRANSVERSE COLON and the SIGMOID COLON.
Duodenum: The shortest and widest portion of the SMALL INTESTINE adjacent to the PYLORUS of the STOMACH. It is named for having the length equal to about the width of 12 fingers.
Esophagus: The muscular membranous segment between the PHARYNX and the STOMACH in the UPPER GASTROINTESTINAL TRACT.
Female:
Gastrin-Secreting Cells: Endocrine cells which secrete GASTRIN, a peptide that induces GASTRIC ACID secretion. They are found predominantly in the GASTRIC GLANDS of PYLORIC ANTRUM in the STOMACH, but can also be found in the DUODENUM, nervous and other tissues.
Germ Cells: The reproductive cells in multicellular organisms at various stages during GAMETOGENESIS.
Giant Cells: Multinucleated masses produced by the fusion of many cells; often associated with viral infections. In AIDS, they are induced when the envelope glycoprotein of the HIV virus binds to the CD4 antigen of uninfected neighboring T4 cells. The resulting syncytium leads to cell death and thus may account for the cytopathic effect of the virus.
Granulosa Cells: Supporting cells for the developing female gamete in the OVARY. They are derived from the coelomic epithelial cells of the gonadal ridge. Granulosa cells form a single layer around the OOCYTE in the primordial ovarian follicle and advance to form a multilayered cumulus oophorus surrounding the OVUM in the Graafian follicle. The major functions of granulosa cells include the production of steroids and LH receptors (RECEPTORS, LH).
Ileum: The distal and narrowest portion of the SMALL INTESTINE, between the JEJUNUM and the ILEOCECAL VALVE of the LARGE INTESTINE.
Intestines: The section of the alimentary canal from the STOMACH to the ANAL CANAL. It includes the LARGE INTESTINE and SMALL INTESTINE.
Islets of Langerhans: Irregular microscopic structures consisting of cords of endocrine cells that are scattered throughout the PANCREAS among the exocrine acini. Each islet is surrounded by connective tissue fibers and penetrated by a network of capillaries. There are four major cell types. The most abundant beta cells (50-80%) secrete INSULIN. Alpha cells (5-20%) secrete GLUCAGON. PP cells (10-35%) secrete PANCREATIC POLYPEPTIDE. Delta cells (~5%) secrete SOMATOSTATIN.
Jejunum: The middle portion of the SMALL INTESTINE, between DUODENUM and ILEUM. It represents about 2/5 of the remaining portion of the small intestine below duodenum.
Kidney: Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.
Intestine, Large: A segment of the LOWER GASTROINTESTINAL TRACT that includes the CECUM; the COLON; and the RECTUM.
Liver: A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances.
Male:
Mast Cells: Granulated cells that are found in almost all tissues, most abundantly in the skin and the gastrointestinal tract. Like the BASOPHILS, mast cells contain large amounts of HISTAMINE and HEPARIN. Unlike basophils, mast cells normally remain in the tissues and do not circulate in the blood. Mast cells, derived from the bone marrow stem cells, are regulated by the STEM CELL FACTOR.
Meckel Diverticulum: A congenital abnormality characterized by the outpouching or sac formation in the ILEUM. It is a remnant of the embryonic YOLK SAC in which the VITELLINE DUCT failed to close.
Omentum: A double-layered fold of peritoneum that attaches the STOMACH to other organs in the ABDOMINAL CAVITY.
Pancreas: A nodular organ in the ABDOMEN that contains a mixture of ENDOCRINE GLANDS and EXOCRINE GLANDS. The small endocrine portion consists of the ISLETS OF LANGERHANS secreting a number of hormones into the blood stream. The large exocrine portion (EXOCRINE PANCREAS) is a compound acinar gland that secretes several digestive enzymes into the pancreatic ductal system that empties into the DUODENUM.
Peritoneum: A membrane of squamous EPITHELIAL CELLS, the mesothelial cells, covered by apical MICROVILLI that allow rapid absorption of fluid and particles in the PERITONEAL CAVITY. The peritoneum is divided into parietal and visceral components. The parietal peritoneum covers the inside of the ABDOMINAL WALL. The visceral peritoneum covers the intraperitoneal organs. The double-layered peritoneum forms the MESENTERY that suspends these organs from the abdominal wall.
Rectum: The distal segment of the LARGE INTESTINE, between the SIGMOID COLON and the ANAL CANAL.
Rest: Freedom from activity.
Colon, Sigmoid: A segment of the COLON between the RECTUM and the descending colon.
Skin: The outer covering of the body that protects it from the environment. It is composed of the DERMIS and the EPIDERMIS.
Intestine, Small: The portion of the GASTROINTESTINAL TRACT between the PYLORUS of the STOMACH and the ILEOCECAL VALVE of the LARGE INTESTINE. It is divisible into three portions: the DUODENUM, the JEJUNUM, and the ILEUM.
Stomach: An organ of digestion situated in the left upper quadrant of the abdomen between the termination of the ESOPHAGUS and the beginning of the DUODENUM.
Sweat Glands: Sweat-producing structures that are embedded in the DERMIS. Each gland consists of a single tube, a coiled body, and a superficial duct.
Theca Cells: The flattened stroma cells forming a sheath or theca outside the basal lamina lining the mature OVARIAN FOLLICLE. Thecal interstitial or stromal cells are steroidogenic, and produce primarily ANDROGENS which serve as precusors of ESTROGENS in the GRANULOSA CELLS.
Thymus Gland: A single, unpaired primary lymphoid organ situated in the MEDIASTINUM, extending superiorly into the neck to the lower edge of the THYROID GLAND and inferiorly to the fourth costal cartilage. It is necessary for normal development of immunologic function early in life. By puberty, it begins to involute and much of the tissue is replaced by fat.
Colon, Transverse: The segment of LARGE INTESTINE between ASCENDING COLON and DESCENDING COLON. It passes from the RIGHT COLIC FLEXURE across the ABDOMEN, then turns sharply at the left colonic flexure into the descending colon.
Neoplasms: 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.
Yolk Sac: The first of four extra-embryonic membranes to form during EMBRYOGENESIS. In REPTILES and BIRDS, it arises from endoderm and mesoderm to incorporate the EGG YOLK into the DIGESTIVE TRACT for nourishing the embryo. In placental MAMMALS, its nutritional function is vestigial; however, it is the source of INTESTINAL MUCOSA; BLOOD CELLS; and GERM CELLS. It is sometimes called the vitelline sac, which should not be confused with the VITELLINE MEMBRANE of the egg.