powerpoint : disorders-of-the-thyroid-gland-ii
TRANSCRIPT
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HYPERTHYROIDISM
Increased serum levels of thyroid hormones,
Surgical correction is frequently appropriate
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HYPERTHYROIDISM
Common causes:- diffuse toxic goitre (Graves’s disease),- toxic multinodular goitre (Plummer’s disease),- toxic solitary nodule,- exogenous thyroid hormone excess,- thyroiditis
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HYPERTHYROIDISM
Rare causes: - metastatic thyroid carcinoma, - pituitary tumour secreting TSH
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GRAVES’S DISEASE
The most common cause of hyperthyroidismIt is an immunological disordersThyroid stimulating antibodies (Ig G type)
bind to the TSH receptor of the thyroid cells- excess of the thyroid hormones
The thyroid gland hypertrophiesDiffuse enlargement
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GRAVES’ DISEASEClinical Diagnosis
Symptoms and signs of thyrotoxicosis result from excess thyroid hormones:Cardio vascular Neurological Metabolic ExophtalmosDiffuse enlargement of the thyroid
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GRAVES’ DISEASE
Ophthalmopathy- two major components:-Non-infiltrating ophthalmopathy
-sympathetic activity - upper lid retraction, - a stare, - infrequent blinking
-Infiltrating ophthalmopathy- edema of the orbital contents, lids, periorbital tissue, cellular infiltration within the orbit
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Surgical specimen
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Recurrent Grave’s disease after subtotal thyroidectomy, nodule at the piramidal lobe
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Right thyroid nodules after subtotal thyroidectomy
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Nodules with cystic degeneration after subtotal thyroidectomy
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Left upper nodule with cystic degeneration
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GRAVES’ DISEASEINVESTIGATIONSLaryngoscopy- mobility of vocal cordsCXR, ECGMeasurement of free T3, T4, TSHIsotope scanning not essential but necessary
in the assessment of toxic solitary and multinodular goitre- the site of nodular overactivity
Radioactive iodine uptake- increased uptake in the thyroid gland
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GRAVES’ DISEASETREATMENT
To restore the euthyroid state:Antithyroid drugs+ beta-blockersRadioactive iodine- distroys overactive tissueSurgery- bilateral subtotal/total thyroidectomy
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Grave’s diseaseMultiple nodules and hypervascularity
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Grave’s diseasePressure symptoms
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TOXIC MULTINODULAR GOITRETREATMENT
ATD- waste of timeRadioactive iodine- not indicatedSurgery- total thyroidectomy appropriate
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TOXIC SOLITARY NODULETREATMENT
This condition is caused by a single autonomous thyroid nodule
Best option- Surgery- unilateral thyroid lobectomy
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Thyroid scintigramAutonomous adenoma in
the right lobe of the struma.
The test substance accumulates almost exclusively in the range of the autonomous adenoma. The other areas of the struma show a considerable reduced accumulation of activity.
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Toxic compressive goiter
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Toxic nodular goiter
Thyroid USS: LTL-vol. 86,98 ml., RTL- vol. 5,54 ml. TSH=0,1 mcg/ml (0,4-7)
CT- expansive solid nodule LTLENT exam.- laryngoscopy- left recurent nerve
palsyAP- nodular goiter with cystic degeneration
and areas of hyperfunction
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HYPERTHYROIDYPREOPERATIVE PREPARATION
Surgery must be done in the euthyroid state ATD for a period then discontinueBetablockers to control cardiac symptomsLugol’s solution,10 days, will diminish the
peroperative hemorrhagic risk
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POSTOPERATIVE COMPLICATIONS
1. Postoperative bleeding2. Postoperative thyrotoxic crisis3.Postoperative voice changes4. Hypoparathyroidism5. Hypothyroidism
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POSTOPERATIVE BLEEDINGPostoperative bleeding
there is always a risk of postop.bleeding,it is rare but sometimes dramatic
The bleeding may occur in one of two sites,- deep to the myofascial layer in relation to
thyroid vessels-evacuation must be done quickly
- deep to the skin flaps, from veinsCompressive hematoma- respiratory
embarrasment- evacuation is mandatory
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POSTOPERATIVETHYROTOXIC CRISIS
Serious complication-where there has not been adequate preop.preparation
It occurs within the first 24 hours of thyroidectomy
Symptoms: confusion, hyperactive, fever, profuse sweating, rapid PR.
Treatment: beta-blockers, iv steroids, iodine
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POSTOPERATIVE VOICE CHANGESRare due to any damage to recurrent laryngeal
nerves- this occurs in less than 1%Probably minor changes in the muscles around
the cricoid and thyroid cartilages are the most important, inevitable with the mobilization of the gland
Trauma to external laryngeal nerve- cricothyroid muscle- voice change- difficulty in achieving vocal cord tension
Trauma t the internal laryngeal nerve can occur where there is difficulty in mobilizing the superior pole
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POSTOPERATIVE HYPOPARATHYROIDISMHypocalcemia- usually a consequance of a
metabolic changes- re-entry of calcium into bone demineralized by hyperthyroidism (“hungry bones”)
Parathyroids are small and are not always easy to identify
The incidence of hypoparathroidism after surgery shoud be less than 1%
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Hipoparathyroidism and hypocalcemiaTransient or definitive- 1%-15%Manipulation of the PT glands- neck
dissectionSingle vs. 3 glands preserved for normal PT
fct.Non-capsular dissection technique- risk of
injuryIncidental removal with thyroid gland PT- reimplant into the SCM muscleIdentification of PT- avoid injury risk
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Hypoparathyroidism
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THYROID CANCERTumors of thyroid follicular epithelium
Papillary carcinomaFollicular carcinomaAnaplastic carcinoma
Tumors of parafollicular cellsMedullary carcinoma
Tumors of lymphoid cellsLymphoma
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PAPILLARY CARCINOMAThe commonest thyroid tumorPrevious neck irradiation-risk factor-thy.ca.Hard whitish noduleLymphatic spreadThree types based on tu. size and extent:
Minimal lesion<1cmIntrathyroid lesion>1cm.within the thyroidExtrathyroid lesion-locally advanced
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FOLLICULAR CARCINOMA
Encapsulated, solitary noduleUsually firm, but soft when intratumor hg.Spread via the boodstreamTwo main types after histopathology:
Minimally invasive-slight capsular or vascular invasion
Frankly invasive-venous extension into thyroid and jugular veins
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The TNM stages of thyroid cancer
“TNM” stands for Tumour, Node, Metastasis. T1 - the tumour is entirely inside the thyroid and is less
than 2cm across in any direction T2 - The tumour is entirely inside the thyroid and is more
than 2cm but no more than 4cm across in any direction T3 - The tumour is entirely inside the thyroid and is more
than 4cm across in any direction T4a - The cancer has grown outside the thyroid gland into
the surrounding tissue. T4b - The cancer has grown outside the thyroid gland into
the area surrounding the bones of the spine, or one of the main blood vessels nearby.
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TNM stagingN0- no lymph nodes contain cancer cellsN1a - there are lymph nodes containing cancer cells on one
side of the neck only (on the same side as the cancer) N1b - there are lymph nodes containing cancer cells
anywhere else (usually the other side of the neck or in the chest)
M0- no distant MTSM1 - present distant MTS
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TNM stagingDifferentiated thyroid cancer: papillary and folicular thyroid cancerUnder 45years of age:Stage 1 - cancer is only inside the thyroid, or
the thyroid and the lymph glands
Stage 2 - cancer has spread presenting metastases
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TNM staging for differentiated thyroid cancer, over 45 years of age
Stage 1 - cancer is only inside the thyroid and is less than 2cm across
Stage 2 - cancer is any size, but is only inside the thyroid
Stage 3 - cancer has grown beyond the thyroid capsule, or there are cancer cells in the lymph nodes
Stage 4 - cancer has spread to other parts of the body, such as lungs or bones
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TREATMENT OF DIFFERENTIATED THYROID CANCER
Thyroidectomy is the treatment of choiceObjectives- to eradicate primary tumor - to reduce the incidence of recurrencePapillary cancer-multifocality-total
thyroidectomy is the best option plus clearance of cervical lymph nodes
Follicular cancer- if minimal-lobectomy - If invasive-total thyroidectomy
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POSTOPERATIVE TREATMENTThyroxine after total thyroidectomyThyroglobuline measurement-sensitive
indicator of residual or recurrent differentiated thyroid cancer after total thyroidectomy
Radioactive iodine is a useful means of detecting metastatic disease after total thyroidectomy
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ANAPLASTIC CARCINOMAHighly aggressive tumor, affects the
elderlyRapidly infiltrates local structuresMetastases via bloodstream, lymphaticsLong history of goitre that suddenly starts
to grow rapidlyVoice change, dysphagia, dyspneaResection is rarely possibleSurvival within six months
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Staging for anaplastic thyroid cancerThere is no number staging system for
anaplastic thyroid cancer. This is because there is a high risk of the
cancer spreading. If the cancer is only in the neck - complete
removal If the patient is fit enough - surgery or
radiotherapy
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MEDULLARY CARCINOMAIncidence-8% of thyroid malignanciesSolid non-follicular carcinomaArises from the parafollicular cells, C-cells
which secretes calcitonin- hypocalcemiaIn the upper 2/3rds, multicentric, bilateralSpreads by lymphatics to regional nodesSpreads via bloodstream to liver, lungs,
bones
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MEDULLARY CARCINOMAThis tumor produces calcitonin- tu.markerCEA- another tu.markerThis tu. can secrete a range of hormones and
peptides: prostaglandins, 5-hydroxitryptamine, ACTH.
Diagnosis- FNAC, serum calcitoninAssociation with pheochromocytoma- urinary
VAM and metanephrines
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MEDULLARY CARCINOMATREATMENT Total thyroidectomy is the best optionCentral and paratracheal lymph nodes
clearance,Carotid sheath nodes removed, if involved
with tu.- modified radical neck dissection, preserving IJV, SCM, spinal accessory nerve.
Bilateral lymph nodes clearance is advised
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Medullary thyroid cancer
There are 4 number stages for medullary thyroid cancer. These are:
Stage 1 - cancer is less than 2cm across Stage 2 - cancer is between 2cm and 4cm
across Stage 3 - There is spread to cervical lymph
nodes Stage 4 - The cancer cells have spread to
another part of the body
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MEDULLARY CARCINOMAFOLLOW-UP
Follow-up: calcitonin, CEAIf raised- persistent or recurrent diseaseUltrasonography, CT, MRI,scintigraphyExternal irradiation- last chanceChemotherapy is disapointingPresent lymph nodes metastases-survival rate
is 45% at 10 years
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THYROIDITIS
Subacute thyroiditisAutoimmune thyroiditisRiedel’s thyroiditisAcute suppurative thyroiditis
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SUBACUTE THYROIDITISGranulomatous or de Quervain’s thyroiditisProbably viral originPainful swelling of one or both thyroid
lobes, malaise, feverPreceding history of sore throat or viral
infection a week or two before the onset of thyroid symptoms
Symptoms and signs of hyperthyroidismThyroid hormone levels raised but low
uptake of radioactive iodine, ESR is raised
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SUBACUTE THYROIDITIS
The disease process is self-limiting with resolution of local sy. and thy. dysfunction
Few pts. pass through a mild hypothyroid phase
Local sy.-aspirin, steroidsTransient hyperthyroidism does not require
antithyroid drugs
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AUTOIMMUNE THYROIDITIS
Diffuse process throughout the thyroid gland- Hashimoto’s disease
Infiltration of thyroid by lymphocytes and plasma cells
Immunological disorder- serum thyroid ab.Hypothyroidism- thyroxine, steroidsNodule present- FNAC to rule out lymphoma
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RIEDEL’S THYROIDITIS
Invasive fibrous thyroiditis- dense fibrous inflammatory infiltrate throughout the thyroid extended extracapsular
Rare condition, can mimic malignancyTamoxifen, or surgery for pressure sy.
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ACUTE SUPPURATIVE THYROIDITIS
The thyroid can be infected by bacterial or fungal agents
Acute painfully inflammed glandNeedle aspiration- dg. & bacteriologyAppropriate antibiotics
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PRIMARY HYPERPARATHYROIDISMSymptoms: renal lithiasis, osteitis fibrosa
cystica, peptic ulcer, cholelithiasis, weakness, constipation
Lab. tests: elevated serum calcium, serum PH high, decreased serum phosphorus, hyperphosphaturia
Radiology: skull XR- ground-glass appearance
Localization: USS, CT, MRISurgery- removal of adenoma
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DISORDERS OF THE PARATHYROID GLANDPTH- regulator of calcium metabolismActs in conjunction with calcitoninSerum Ca falls- PTH increasesSerum Ca rises- PTH decreasesIncreased PTH secretion:
HypercalcemiaHypocalciuriaHypophosphatemiahyperphosphaturia
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PRIMARY HYPERPARATHYROIDISMMay occur as:
- part of a multiple endocrine adenomatosis syndrome,
- familial hyperparathyroidism, - ectopic tumor90% due to a solitary adenoma10% due to four-gland hyperplasia1%- due to parathyroid carcinoma
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Osteita fibrosa cystica- parathyroid adenoma
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Left parathyroid adenoma
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Left parathyroid adenoma
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Right parathyroid adenoma
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Right parathyroid adenoma
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Parathyroid adenoma
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Surgical specimen
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What is abnormal at this face??
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Myasthenia gravis
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Motor end-plate in MG
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Which organ is involved in the patholopgy of MG??
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Where the thymus is located??
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Pneumomediastinography
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A.Gh. 65 years old, 3 w. of severe myasthenia, Oss.IIICT-calcified thymoma adherent to the left mediastinal pleura, op. 2003, histology- type A, medullary thymoma without capsular invasion, chemotherapy CP+PDN, obvious improvement
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CT, 60 years old, thymoma+MG, Oss.IV, op. 2002, Lymphocitic thymoma (type I malignant thymoma)-Masaoka II ( well encapsulated but microscopic capsular invasion), adhesions to left M. pleura which was resected
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Radiotherapy 44 Gy, chemotherapy, 1 year CP+PDNPericarditis and mixedema at 1 year postRxTRemission of MG for 5 years, 2008- AChE
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Different approaches to the thymus
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Position of the patient for thymectomy
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Sterile field
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Median complete sternotomy
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Dissection
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Intradermic suture
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OP.IAN.2009
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Longitudinal incision
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Sternotomy
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Sternal retracter
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Dissection
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Dissection
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Dissection
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Dissection
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Dissection
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Dissection
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Left innominate vein
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Mediastinal aspect after tumor resection+pleurectomy
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Sternoraphy- 3 metalic wires
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Specimen
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CT-2009
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Presternal fascial closure
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Skin sutured
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Right eye ptosis