Dermoid Cyst: From 3 Different Sources
A noncancerous tumour with a cell structure similar to that of skin.
It contains hairs, sweat glands, and sebaceous glands.
Dermoid cysts may also contain fragments of cartilage, bone, and even teeth.
The cysts may occur in various parts of the body.
Ovarian dermoid cysts account for 10 per cent of all ovarian tumours.
Only rarely do they become cancerous.
In the skin, dermoid cysts most commonly occur on the head or neck.
Surgical removal is usually recommended.
(See also teratoma).
See CYSTS.
(dermoid) a benign tumour – a type of *teratoma – containing developmentally mature skin complete with hair follicles and sebaceous glands, and often pockets of sebum, blood, fat, bone, nails, teeth, eyes, cartilage, and thyroid tissue, which may give rise to symptoms of thyrotoxicosis. It is usually found at sites marking the fusion of developing sections of the body in the embryo and is the most common benign ovarian tumour in girls and young women. Sometimes a dermoid cyst may develop after an injury. Treatment is complete surgical removal, preferably in one piece and without any spillage of cyst contents. Tumours in the skin are best removed by a plastic surgeon. Because of the risks of surgery and anaesthesia to pregnant women, it is usually considered more feasible to remove bilateral dermoid cysts of the ovaries discovered during pregnancy only if they grow beyond 6 cm in diameter. The procedure is usually performed through laparotomy or very carefully through laparoscopy and should preferably be done in the second trimester.
Inflammation of a bladder, especially the urinary bladder... cystitis
This is the most common serious genetic disease in Caucasian children, with an incidence of about one per 2,500 births, and more than 6,000 patients in the UK (30,000 in the USA). It is an autosomal recessive disorder of the mucus-secreting glands of the lungs, the pancreas, the mouth, and the gastrointestinal tract, as well as the sweat glands of the skin. The defective gene is sited on chromosome 7 which encodes for a protein, cystic ?brosis transmembrane conductance regulator (CFTR). Individuals who inherit the gene only on one set of chromosomes can, however, carry the defect into successive generations. Where parents have a child with cystic ?brosis, they have a one-infour chance of subsequent children having the disease. They should seek GENETIC COUNSELLING.
The disorder is characterised by failure to gain weight in spite of a good appetite, by repeated attacks of bronchitis (with BRONCHIECTASIS developing at a young age), and by the passage of loose, foul-smelling and slimy stools (faeces). AMNIOCENTESIS, which yields amniotic ?uid along with cells shed from the fetus’s skin, can be used to diagnose cystic ?brosis prenatally. The levels of various enzymes can be measured in the ?uid and are abnormal when the fetus is affected by cystic ?brosis. Neonatal screening is possible using a test on blood spots – immunoreactive trypsin (IRT).
In children with symptoms or a positive family history, the disease can be tested for by measuring sweat chloride and sodium. This detects the abnormal amount of salt that is excreted via the sweat glands when cystic ?brosis is present. Con?rmation is by genetic testing.
Treatment This consists basically of regular physiotherapy and postural drainage, antibiotics and the taking of pancreatic enzyme tablets and vitamins. Some children need STEROID treatment and all require nutritional support. The earlier treatment is started, the better the results. Whereas two decades ago, only 12 per cent of affected children survived beyond adolescence, today 75 per cent survive into adult life, and an increasing number are surviving into their 40s. Patients with end-stage disease can be treated by heart-lung transplantation (with their own heart going to another recipient). Research is underway on the possible use of GENE THERAPY to control the disorder. Parents of children with cystic ?brosis, seeking help and advice, can obtain this from the Cystic Fibrosis Trust.... cystic fibrosis
The surgical excision of the bladder (see URINARY BLADDER). When this is done – usually to treat cancer of the bladder – an alternative means of collecting urine from the KIDNEYS must be arranged. The URETERS of the kidney can be transplanted into a loop of bowel which is brought to the surface of the abdomen to form a STOMA that exits into an externally worn pouch. The latest surgical technique is to fashion a substitute bladder from a section of intestine and to implant the ureters into it, thus allowing the patient to void urine through the urethra as normal.... cystectomy
A technique for measuring the pressure in the URINARY BLADDER as part of a URODYNAMIC investigation to assess the functioning of the bladder.... cystometry
A misnomer applied to epidermoid cysts of the skin whose contents are kerateous not sebaceous. The common ‘wen’ of the scalp arises from follicular epithelium and is similar.... sebaceous cyst
A cyst arising in the neck from remnants of the embryological branchial clefts. They are usually ?uid-?lled and will therefore transilluminate.... branchial cyst
Benign tumour of epithelial tissue forming cysts.... cystadenoma
Pain in the urinary bladder... cystalgia
An amino acid containing SULPHUR that is an essential constituent of many of the body’s enzymes. (See AMINO ACIDS; ENZYME.)... cysteine
The tube that runs from the gall-bladder (see LIVER) and joins up with the hepatic duct (formed from the bile ducts) to form the common BILE DUCT. The BILE produced by the liver cells is drained through this system and enters the small intestine to help in the digestion of food.... cystic duct
Larval stage of tapeworms belonging to the genus Taenia. Also known as bladderworms. The cysticercus of the Pork Tapeworm is called Cysticercus cellulosae and is the cause of human cysticercosis.... cysticercus
Mucous discharge from the bladder... cystorrhea
See: FIBROCYSTIC BREAST DISEASE. ... breast, cyst
A fluid-filled lump behind the knee. A Baker’s cyst is caused by increased pressure in the knee joint due to a buildup of fluid in a disorder such as rheumatoid arthritis. Most Baker’s cysts are painless, and some disappear spontaneously. Occasionally, a cyst may rupture, producing pain and swelling in the calf that can mimic a deep vein thrombosis (see thrombosis, deep vein). Diagnosis of a Baker’s cyst is confirmed by ultrasound scanning. Treatment is rarely needed.... baker’s cyst
The surgical creation of a hole in the bladder usually performed to drain urine when the introduction of a catheter is inadvisable or impossible.... cystostomy
See chalazion.... meibomian cyst
A larval form of a tapeworm (e.g. Hymenolepis) which has a solid body and no bladder.... cysticercoid
A PROLAPSE of the base of the URINARY BLADDER in a woman. The pelvic ?oor muscles may be weakened after childbirth and, when the woman strains, the front wall of the vagina bulges. Stress incontinence often accompanies a cystocoele and surgical repair is then advisable (see COLPORRHAPHY).... cystocoele
Pain in the urinary bladder... cystodynia
An X-ray picture of the URINARY BLADDER.... cystogram
An instrument for measuring the pressure in the URINARY BLADDER.... cystometer
Hollow tumours (see TUMOUR), containing ?uid or soft material. They are almost always simple in nature.
Retention cysts In these, in consequence of irritation or another cause, some cavity which ought naturally to contain a little ?uid becomes distended, or the natural outlet from the cavity becomes blocked. Wens are caused by the blockage of the outlet from sebaceous glands in the skin, so that an accumulation of fatty matter takes place. RANULA is a clear swelling under the tongue, due to a collection of saliva in consequence of an obstruction to a salivary duct. Cysts in the breasts are, in many cases, the result of blockage in milk ducts, due to in?ammation; they should be assessed to exclude cancer (see BREASTS, DISEASES OF). Cysts also form in the kidney as a result of obstruction to the free out?ow of the urine.
Developmental cysts Of these, the most important are the huge cysts that originate in the OVARIES. The cause is doubtful, but the cyst probably begins at a very early period of life, gradually enlarges, and buds o? smaller cysts from its wall. The contents are usually a clear gelatinous ?uid. Very often both ovaries are affected, and the cysts may slowly reach a great size – often, however, taking a lifetime to do so.
A similar condition sometimes occurs in the KIDNEYS, and the tumour may have reached a great size in an infant even before birth (congenital cystic kidney).
Dermoid cysts are small cavities, which also originate probably early in life, but do not reach any great size until fairly late in life. They appear about parts of the body where clefts occur in the embryo and close up before birth, such as the corner of the eyes, the side of the neck, and the middle line of the body. They contain hair, fatty matter, fragments of bone, scraps of skin, even numerous teeth.
Hydatid cysts are produced in many organs, particularly in the liver, by a parasite which is the larval stage of a tapeworm found in dogs. They occur in people who keep dogs and allow them to contaminate their food. (See TAENIASIS.)... cysts
A cyst formed by endogenous or exogenous budding from the germinal layer of a hydatid.... daughter cyst
Urethral irritation from excess sexual activity...or as a famous French writer described it,”the plentiful rubbing together of bacons.... honeymoon cystitis
A pathological rather than a clinical entity. The term refers to the replacement of BONE by a highly cellular and vascular connective tissue. It is the result of osteoclastic and osteoblastic activity and is due to excessive PARATHYROID activity. It is thus seen in a proportion of patients with primary hyperparathyroidism and in patients with uraemic osteodystrophy; that is, the secondary hyperparathyroidism that occurs in patients with chronic renal disease.... osteitis fibrosa cystica
Relating to the bladder, as in cystitis (inflammation of the bladder).... cyst-/cysto-
An X-ray procedure for studying the bladder while urine is passed. Micturating cystourethrography is most commonly used in young children to detect abnormal reflux of urine as the bladder empties.... cystourethrography, micturating
See dermoid cyst.... dermoid tumour
A lymphangioma that occurs around the head and neck, the armpits, or the groin and contains clear fluid. Cystic hygromas are usually present from birth and disappear naturally from the age of about 2.... hygroma, cystic
A fluid-filled sac in the kidney. Most kidney cysts are noncancerous. Cysts commonly develop in people over 50 and may occur singly or multiply in 1 or both kidneys. Most cysts occur for no known reason and do not usually produce symptoms unless they become large enough to cause pain in the lower back due to pressure. However, large numbers of cysts in the kidneys may be associated with polycystic kidney disease (see kidney, polycystic), which often leads to kidney failure. Treatment of simple cysts is not usually necessary, but aspiration (withdrawal of fluid) or surgical removal may be carried out if a cyst is painful or recurs.... kidney cyst
adj. 1. of, relating to, or characterized by cysts. 2. of or relating to the gall bladder or urinary bladder.... cystic
a collection of fluid behind the neck of a fetus, occasionally extending laterally to involve the sides of the neck (see hydrops fetalis). In its mildest form it is evidenced by an increased nuchal translucency (see nuchal translucency scanning). Cystic hygroma may be a diagnostic feature of chromosomal abnormality (e.g. Down’s syndrome, Turner’s syndrome).... cystic hygroma
n. see amino acid.... cystine
n. an inborn defect in the metabolism of amino acids, leading to abnormal accumulation of the amino acid cystine in the blood, kidneys, and lymphatic system. See also Fanconi syndrome.... cystinosis
n. a fine curved needle with a hooked tip or a small knife with a tiny curved or hooked blade, used to create an opening in the lens capsule in the type of operation for cataract in which the capsule is left behind (extracapsular *cataract extraction; see phacoemulsification).... cystitome
n. X-ray examination of the urinary bladder after filling it with a contrast medium. The X-ray images thus obtained are known as cystograms. Cystography is most commonly performed to detect reflux of urine from the bladder to the ureters, usually in children (see vesicoureteric reflux). In adults it is often performed to detect bladder injury or perforation. If films are taken during voiding (micturating cystourethrogram) then the urethra can also be observed (see urethrography). The examination can also be performed in conjunction with manometry (see bladder pressure study).... cystography
swelling of the central area of the retina (macula), usually occurring as a result of trauma, posterior *uveitis, or ocular surgery.... cystoid macular oedema
n. the presence of stones (calculi) in the urinary bladder. The stones are either formed in the bladder, due to obstruction, urinary statis, and infection (primary calculi), or pass to the bladder after being formed in the kidneys (secondary calculi). They cause pain, the passage of bloody urine, and interruption of the urinary stream and should be removed surgically. See calculus.... cystolithiasis
(vesicofixation) n. a surgical operation to fix the urinary bladder (or a portion of it) in a different position. It may be performed as part of the repair or correction of a prolapsed bladder.... cystopexy
n. an operation to enlarge the capacity of and to decrease the pressure within the bladder by incorporating a segment of bowel. In a clam cystoplasty, the bladder is cut across transversely from one side of the neck to the other side through the dome (fundus) of the bladder and a length of the ileum, jejunum, or colon is inserted as a patch. In the operation of ileocaecocystoplasty, the dome is removed by cutting across the bladder transversely or sagittally above the openings of the ureters; it is replaced by an isolated segment of caecum and terminal ileum. In ileocystoplasty the bladder is enlarged by an opened-out portion of small intestine. The bladder may be totally replaced by a reservoir constructed from either small or large intestine (see cystectomy).... cystoplasty
a malignant tumour of the connective tissue of the breast: it accounts for approximately 1% of all breast cancers. Such tumours may show a wide variation in cell structure and they often present as a large mass but without distant spread. The best treatment for a localized tumour is simple *mastectomy.... cystosarcoma phylloides
n. surgical incision into the urinary bladder, usually by cutting through the abdominal wall above the pubic symphysis (suprapubic cystotomy). This is necessary for such operations as removing stones or tumours from the bladder and for gaining access to the prostate gland in the operation of transvesical *prostatectomy.... cystotomy
see sebaceous cyst.... epidermoid cyst
a simple cyst of the *fimbria of the Fallopian tube.... fimbrial cyst
see ovarian cyst.... follicular cyst
vaginal cysts, usually small, that arise from Gartner’s duct – remnants of the Wolffian duct (see mesonephros) in females. No treatment is necessary if the cysts are small and not symptomatic, but surgical *marsupialization or excision may be required if they are large and cause obstruction. [H. T. Gartner (1785–1827), Danish surgeon and anatomist]... gartner’s duct cysts
a chronic nonbacterial inflammation of the bladder accompanied by an urgent desire to pass urine frequently and bladder pain; it is sometimes associated with an ulcer in the bladder wall (Hunner’s ulcer). The cause is unknown and *contracture of the bladder eventually occurs. Treatment is by distension of the bladder under spinal or epidural anaesthetic, instillation of anti-inflammatory solutions into the bladder, and administration of steroids or *NSAIDs. Bladder enhancement or augmentation (see cystoplasty) may be required for a contracted bladder.... interstitial cystitis
see ovarian cyst.... luteal cyst
(MCU) see urethrography.... micturating cystourethrogram
a small (and often painful) cyst containing a thick sticky fluid that develops over the end joint of a finger or toe. It may be in communication with the underlying joint.... myxoid cyst
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