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Transcript of ENDOCRINE SYSTEM Do not write !!!!!! Everything is available @ .
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ENDOCRINE SYSTEM
Do not write !!!!!!
Everything is available @
http://www.lfhk.cuni.cz/patanat/endocrine
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secretion of hormones (steroids, peptides)
feedback inhibition
blood
regulation of activity of various organs
ENDOCRINE SYSTEM
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PITUITARY GLAND
0.5 g
sella turcica (sphenoidal bone)
diaphragma sellae (dura mater)
stalk - neural and vascular connection with
hypothalamus
adeno- neuro- (so called neurohemal organ)
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Adenohyphysis
ventral lobe embryologically derivedfrom mouth cavity (Rathke's cleft)
eosinophils (A cells)
basophils (B cells)
chromophobes
5 hormones: ACTHTSHFSH+LHprolactinGH
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Hyperpituitarism and adenomas of pituitary
prolactinoma 30% from A and chromophobes
FSH + LH 15% from B
ACTH 15% from A and chromophobes
GH 5%
TSH 1%
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majority of adenomas produce only 1 hormoneup to 30% adenomas non-functional – only local pressure effect
„balloon“ expansion of sella usurationrupture of diaphragm + suprasellar growth pressure to chiasma & n. opticus, impression of brain & paranasal sinuses disturbances of vision, headache
X-ray changescarcinoma – very rare
Pituitary adenomas
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Hormonal syndromes
prolactin oligo-, amenorrhea, galaktorrhea, impotence
GH gigantism up to 240 cm acromegaly, macroglossy
ACTH Cushing's d.: obesity, moon-face, hirsutism, hypertension etc. (see adrenal)
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Hypopituitarism
loss of at least 75% of parenchyma due to:
1. nonfunctional adenoma (pressure atrophy)
2. ischemic necrosis (Sheehan's sy = post-partum necrosis of enlarged hypophysis by bleeding or haemorr. shock lactation arrest, no restoration of menstrual cycle)
3. empty sella sy – following inflammation, operation, irradiation herniation of arachnoid & CSF into the
sella
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• pituitary nanism: decrease of GH substitution
• hypogonadism (Fröhlich's sy = dystrophia adiposogenitalis) – accomp. by mental retardation namely in males
• hypothyroidism
• disorders of adrenal cortex
Hypopituitarism - clinical symptoms
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Posterior lobe syndrome
the cause is usually in hypothalamus, very rare
decreased ADH diabetes insipidus (polyuria,
polydypsia, dehydratation)
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Craniopharyngioma
= benign tumor from canalis craniopharyngicus remnants
(residual structure from Rathke's cleft – source of
adenohypophysis)
suprasellar expansion
often cystic, similar structure as adamantinoma of the
jaws
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THYROID GLANDregulated by adenohypophysis (TSH) and blood levels of iodine
thyroglobulin in follicular colloid transformation tothyroxine (T4) a triiodothyronine (T3)
parafollicular C cells calcitonin – facilitates binding of
Ca2+ to bones and inhibits bone resorption
derived from pharyngeal epithelium – thyroglossal duct
persistence thyroglossal duct cyst (median neck cyst)
lingual thyroid
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Thyroid gland - pathology
• more frequent in females (M:F = 1:10!)
• namely enlargement - goiter
• increased secretion - hyperthyroidism,
thyreotoxicosis
• decreased secretion - hypothyroidism
• hyperplasia, inflammations, tumors
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Hyperthyroidism
• diffuse hyperplasia of TG (M. Graves-Basedow)• toxic nodular goiter• toxic adenoma• thyroiditis• pituitary adenoma, hypothalamic disorders
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Hyperthyroidism - clinical symptoms
• increase of basal metabolism, O2 consumption
• restlessness, emotional lability• tremor, sweating, loss of weight, intolerance of warmth• SOB, increased heart rate and output, palpitations congestive heart failure due to thyrotoxic cardiomyopathy (dilated type)• exophtalmus
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Hypothyroidism
• loss of parenchyma (resection, irradiation,
medication)
• Hashimoto's thyroiditis
• idiopathic (autoimmune?) hypothyroidism
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Hypothyroidism - clinical symptomsIN CHILDHOOD - cretinism endemic iodine deficiency in mountain regions( addition of iodine to salt)short stature, big tongue, defective teeth, rough facial features
IN ADULTHOOD - myxedemaaccumulation of mucopolysacharides in corium palethick (doughlike) skin, namely in periorbital areasbradycardia, apathy, intolerance of cold, big lips and tongueenlarged and failing heart with pericardial fluidcoronary arteriosclerosis due to hypercholesterolemia
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THYROIDITIS• Hashimoto's thyroiditis (= H. goiter) most frequent inflammation, autoimmune immune reaction against TG - up to 20× more frequent in females histology: replacement of parenchyma by lymphoid tissue with formation of lymph. follicles with germinal centers follicular cells eosinophillic, finely granular oncocytes (Hürthle cells), goiter Dx.: clinical symptoms, autoAb., US, (+ FNACytology) risk of MALT - lymphoma !
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• Focal lymphocytic t. very frequent, in females usually only subclinical manifestation (increase of TSH, normal T3, T4) often incidental morphological finding
• Subacute granulomatous t. (De Quervain's) viral etiol.? - fever, palp. tenderness, pain, transitory hyperfunction granulomas with multinucleated giant cells heals spontaneously, not operated
• Fibrous goiter (Riedel's) firm idiopathic fibrosis of the gland, merging into surrounding structures, extremely rare
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GRAVES - BASEDOW DISEASE
= toxic goiter (pulsans, vibrans et fremens) most frequent cause of hyperthyroidism (diffuse hyperplasia)• triad: hyperthyroidism
exophthalmia (in 2/3) - edema of retrobulbar connective tissue("malignant" e. – not possible to close eyelids – corneal ulcers - blindness)
pretibial edema - (in 1/6) - mucin, lymphocytes
up to 7× more frequent in femalesautoimmune mechanism (thyroid stimulating Ab., thyroid growth stimulating Ab.) – against TSH-receptors
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GB goiter - histology
"too much epithelium, too few colloid"
epithelial cells tall, colloid pale, "watery", vacuolated
(marginal usurations), stromal lymphoid infiltrates
rich vascularization
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GOITER
this term doesn't say neither anything about etiology
nor about the character of the process
most often of hyperplastic origin
first diffuse, later on nodular
often accompanied by regressive changes
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• Endemic goiter by iodine deficiency decreased synthesis of hormone
compensatory increase of TSH enlargement
(hyperplasia) of the gland
• Sporadic goiter
multifactorial, i.e. iodine and goitrogenes in diet: cabbage,
cauliflower, turnip, kale
females, frequently onset in puberty or pregnancy
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Nodular colloidal goiter
weight 300g up to 1kg, sometimes retrosternal growth
histologically - nodules, sometimes with bleeding
and/or calcifications
micro- normo- a macrofollicular (majority) - large
follicles with colloid (colloidal goiter)
eufunctional g., toxic g., hypofunctional g.
cytology of cold nodes (diff. from carcinoma)
(suspicious goiters and g. with clin. symptoms are operated)
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TUMORS
80% of solitary nodules are adenomasbenign, mainly solitary, spheric, encapsulated
follicular adenomanormofollicular, macrofollicular (colloidal), microfollicular (fetal), trabecular (embryonic)nonfunctional a. (scintigrafic) - cold nodulefunctional a. – hot nodule (= toxic)
oncocytic adenomalarge eosinophillic cells
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CARCINOMAS
not frequent, up to 3 × more often in femalespost-irradiation- Hiroshima 7% survivors, Tschernobyl,
therapeutic irradiation (lymphomas in childhood)
• from follicular cells well differentiated - papillary, follicular, oncocytic poorly differentiated - insular undifferentiated - anaplastic
• from C cells medullary
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• Papillary carcinoma
approx. 70% of all carcinomas
diagnostic feature is not presence of papillae,
but so called „ground glass nuclei"
sometimes only minute (mm) - microcarcinoma
invasion into capsule, fibrosis
psammoma bodies (concentric calcifications)
meta to LN, good prognosis - 80% 10y. survival
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• Follicular carcinoma about 20% of malignancies difficult diff. dg. vs. adenoma - invasion through the capsule and/or vascular invasion! meta to bones, lungs, brain
• Anaplastic carcinoma 10% of malignancies, highly agressive histologically – small cell, large cell, spindle cell type death within 2 years
• Medullary carcinoma from C cells (calcitonin!), sometimes familial occurrence solid foci of small cells, production of amyloid („APUD amyloid")
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PARATHYROID GLANDS
derived from 3rd and 4th branchial pouches (together w. thymus)
! ectopy – frequent; supernumerary glandproduction of parathormone (PTH) :
releases Ca2+ from bones increases Ca2+ level in serum
Hyperparathyroidismprimary - cause within the glandsecondary - causes outside the gland (e.g. kidneys)
hypercalcaemia
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Primary hyperparathyroidism
adenoma or hyperplasia
carcinoma (extremely rare)
• adenoma mostly solitary, up to 2 cm, encapsulated, embedded within thyroid, thymus, soft tissue of the neck histologically chief cells or oxyphillic cells (oncocytes)
treatment = surgery (rarely alcohol injection)
• hyperplasia (all 4 glands) – CAVE – MEN!
clinically metastatic calcification, urolithiasisosteomalacia, ostitis fibrosa cystica (brown tumor of bones)
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Secondary hyperparathyroidismcompensatory hyperfunction most frequent in: chronic renal insuf. (hyperphosphataemia, hypocalcaemia) hypovitaminosis D (reduced supply of Ca2+ increase of PTH hyperplasia of parathyr. g. - reversibleparaneoplastic sy
Hypoparathyroidism
complication of surgery (thyroidectomy)hypocalcaemia neuromuscular cramps (tetany)
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ADRENAL GLANDS
2 organs in 1
cortex vs. medulla
different embryogenesis
different structure & function
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ADRENAL CORTEX
spongiocytes producing steroid hormones glucocorticoids, mineralocorticoids, sex steroids hyperfunction, hypofunction, tumors
• Hyperfunction (hypercorticism) steroids: glucocorticoids (mainly cortisol) Cushing's sy mineralocorticoids (mainly aldosterone) hyperaldosteronism (Conn's sy)
androgens virilism (adrenogenital sy)
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Cushing's sy - clinical symptoms
• obesity (so called arachnoid type)
• moon-face, neck hump, striae
• hypertension, muscle weakness
• osteoporosis, hirsutism and amenorrhea
• impaired metabolism of glucose (steroid diabetes)
• psychotic disorders
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Cushing's sy - causes
• pituitary adenoma – increase of ACTH
hyperplasia of the cortex • functioning cortical adenoma• paraneoplastic sy - (in 10-15%) – increased ACTH
produced by tumor cells (most often small cell lung cancer)
hyperplasia of the cortex • iatrogenic – Cushing's sy caused by treatment
(glucocorticoids - immunosupression atrophy of
the cortex)
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Cushing's sy - morphology
• cortical adenoma - high level of cortisol causes hyaline degeneration of B cells in hypophysis Crooke's cells - atrophy of the cortex
• pituitary adenoma - hyperplasia of adrenal cortex - diffuse or nodular - bilateral
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Hyperaldosteronism
mineralocorticoid aldosteroneregulation through renin-angiotensin system
increased excretion of K+ and retention of Na+ hypokalemia, hypernatremia increased volume
of extracellular fluid, blood hypertension
muscle weakness (including myocardium)primary aldosteronism in cortical adenoma - Conn's sy
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Adrenogenital sy
adenoma, hyperplasia or carcinoma of the cortex
in young females masculinisation
in young males pubertas praecox
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Hypofunction
primary = insufficiency due to damage of cortex (Addison's disease)
secondary = insufficiency due to pituitary lesion ( decrease of ACTH)
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Addison's disease
decrease of gluco-, mineralocorticoids and androgens
damage of at least 90% of parenchyma (bilaterally)
in the past majority of cases - TBC epinephritis
today usually idiopathic - autoimmune?, amyloidosis, meta,
sudden termination of steroid treatment (cortex is atrophic!)
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Addison's disease
•Morphologyleaf-like adrenals (very thin cortex)
•Clinical symptomsweakness, fatigue, skin and mucosa pigmentation - melaninhypoglycemia, hypotensiondiarrhea, loss of weightstress may lead to acute crisis with coma (acute cortical insufficiency)massive bleeding into cortex (labor trauma, venous thrombosis, meningoc. sepsis w. DIC – Waterhause-Friderichsen sy)
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Tumors
• adenoma – majority non-functional, 1-2 cm
incidental finding in US, CT or at autopsy
histology = zona fasciculata• carcinoma – very rare, usually non-functional• myelolipoma - benign mesenchymal tumor
histology – similar to bone marrow
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ADRENAL MEDULLA
chromaffine cells producing epinephrine (adrenalin)
and norepinephrine (noradrenalin)
pathology of medulla: virtually only 2 neoplasms
• Pheochromocytoma• Neuroblastoma
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Pheochromocytoma
production of adrenalin a noradrenalin90% from medulla, 10% from sympatic ganglia (paraganglioma)
„tumor of 3× 10%": 10% bilateral10% extraadrenal10% malignant
grams to kg!histology: polygonal cells, EM a immunocytoch.
neuroendocrine granulesclinically: permanent or paroxysmal hypertension
(tachycardia, sweating, headache)
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Neuroblastoma
highly malignant tumor of children aged 5 - 15 yearsfrom adrenal medulla and sympat. ganglia (cervical, thoracic and abdominal)related to retinoblastomafrequent necroses, bleeding and intratumoral calcifications(X-ray!), sometimes production of catecholamins
histology: small cells, Homer-Wright rosettesmetastases to bones and liveraccording to degree of differentiationneuroblastoma ganglioneuroblastoma
ganglioneuroma
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LANGERHANS‘ ISLETS
part of APUD system
A-cells (glucagon - hyperglycemia)
B- cells (insulin)
D- cells (somatostatin - „inhibits“ both above mentioned)
PP- cells (pancr. polypeptide - activates secretion
of various GI enzymes)
gastrin – where???
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DIABETES MELLITUS
!! 5% of population in Czech Republic !!chronic defect of carbohydrates metabolismaffects also metabolism of lipids and proteinsinsufficient production of insulin by B-cells hyperglycemia glycosuria, polyuria (osmotic)causes: idiopathic (genetic) secondary (destruction of L.i. by inflammation,
surgery, tumor, hemochromatosis)
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Idiopathic DM
type I insulin-dependent, juvenile 10%type II insulin-non-dependent, adult 90%
genetic disposition
obesity (80% DM-II pts. are obese, 60% of obese pts.
have disorders of metabolism of carbohydrates)
pregnancy, stress, viral infections
7th most frequent cause of death – increasing tendency!
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Pathogenesis of DMinsulin regulates: utilisation of glucosis in cells
synthesis of glycogen (liver and muscles) synthesis of triglycerides from glucose synthesis of proteins
lack of insulin hyperglycemiaglycosuria + ketosis + acidosis intoxication by ketones
diabetic coma
DM I - insulin is missingB cells destroyed by autoimmunity, viral infection, ???survival - exogenous insulin (insulin-dependent DM)DM II – mildly impaired secretion + resistance
of peripheral cells to insulin
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Morphology
• Pancreas – changes of L. islets
• often none• sometimes reduction of size and/or number• sometimes increase of size and/or number - babies of diabetic mothers• less frequently APUD amyloid in L.i.• degranulation of B cells (EM)• lymphocytic infiltration of L.i. („insulitis")
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• Vesselsfrom capillary vessels to aortaafter 10-15 years since onset of DM are vascular lesions prominent!
• diabetic microangiopathy thickening of BM and narrowing of capillariesskin, retina, nerves, muscles, glomerules
• arteriolosclerosishyaline change in arterioles, identical with hypertonicsometimes combination
• arteriosclerosismost prominent in large arteries
MI (most freq. cause of d. in diabetics) – silent !diabetic gangrene of lower extr. (10× amputations)
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• Kidneys
2nd most freq. cause of death in diabetics is renal failure
Diabetic nephropathy four lesion - glomerular, vascular, tubular, pyelonephritic
• glomerulosclerosis diffuse or nodular (Kimmelstiel - Wilson) thickened BM and hyalinization within glomeruli
• arterio- and arteriolosclerosis necrosis of papillae nephrosclerosis (arteriosclerotic, arteriolosclerotic)
• storage of glycogen in tubular cells (Armani cells) and steatosis
• pyelonephritis – more frequent than in non-diabetics
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• Eyes
diabetic retinopathy diagnostic of DM (ophthalmoscopy)
based on vascular changes exudation, edema,
bleeding, microaneurysms, fibrosis
cataract of lens (turbidity)
glaucoma (even blindness)
changes in retina correlate with changes in kidneys
non-invasive monitoring!
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• Nerves
diabetic neuropathy – lower extremitiesvascular changes: damage of both motoric and sensoric functions
• Other
liver steatosis, „glycogen nuclei"
necrobiosis lipoidica of the skin
immunosupression infections
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Clinical symptoms - "3× poly"
• polyuria (excessive urination)• polydypsia (excessive thirst)• polyfagia (excessive appetite)
laboratory - hyperglycemia, glycosuria
type I – symptoms since onset (usually childhood)type II – symptoms at circa 40's
average age of diabetics for 7 - 9 y. shorter, namely in type I
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Syndrome of multiple endocrine neoplasia (MEN)
(polyendocrine sy, polyadenomatosis)
familial - autosomaly dominant inheritancehyperplasia, adenoma or carcinoma
• MEN I (Wermer's sy) pituitary, parathyroid, L.i. (hypercalcaemia, hypoglycemia, hypergastrinemia) – persisting gastric peptic ulcer
(Zollinger - Ellison's sy)
• MEN II (=MEN IIa = Sipple's sy) medullary ca of thyroid, pheochromocytoma
• MEN III (MEN IIb) = MEN II + skin & mucosal neuromas