thyroid disease in childrenthyroid disease in children michelle schweiger, d.o. center for pediatric...
TRANSCRIPT
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THYROID DISEASE IN
CHILDREN
Michelle Schweiger, D.O.
Center for Pediatric and Adolescent Endocrinology
Cleveland Clinic Foundation
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Neither I nor any immediate family
members have any financial interests
that may be construed as a conflict of
interest with this presentation.
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LEARNING OBJECTIVESAt the end of this lecture, participants will be able to:
1 Recognize and evaluate the following conditions in children:
– congenital hypothyroidism
– acquired hypothyroidism
– hyperthyroidism
– thyroid nodules
2 Initiate treatment for congenital hypothyroidism
3 Treat acquired hypothyroidism
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Thyroid Development
• Thyroid gland develops at 24 days gestation
• Starts development at the base of the tongue (foramen
cecum)
• Connected to the tongue via thyroglossal duct
• Arises from an outpouching of the forgut (endoderm)
• Genes Involved:
– NKX2.1 (TTF-1)
– TTF-2 (FOXE1)
– PAX-8
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Thyroid Development
• Migrates down to the normal location over the
thyroid cartilage by 8-10 weeks
• Thyroglossal duct is the remnant; involutes
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Courtesy of Dr. Dennis Brenner
Lingual Thyroid
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Ectopic Thyroid
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Rosalind S. Brown. Disorders of thyroid gland infancy,
childhood, adolescence, march 21, 2012
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SIGNS OF CONGENITAL
HYPOTHYROIDISMPERCENT WITH SIGN AT 5 WEEKS
• 31% prolonged
jaundice
• 23% umbilical hernia
• 21% constipation
• 21% macroglossia
• 19% feeding problems
• 16% hypotonia
• 16% hoarse cry
• 13% large posterior
fontanelle
• 10% dry skin
• 5% hypothermia
• 2% goiter
• 40% delayed bone age
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Congenital hypothyroidism occurs in 1:4000 infants.
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Congenital hypothyroidism
• Wordwide iodine deficiency is the most common
cause of congenital primary hypothyroidism and
of preventable mental retardation
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Dr Paul W. Ladenson Johns Hopkins University.
Goiter and thyroid nodules2008-06-10
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Congenital hypothyroidism
• Thyroid dysgensis-98% sporadic
• Agenesis: failure of thyroid gland to develop
• Most common in iodine sufficient areas
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Pendred syndrome
• Autosomal recessive
• Most common cause of syndromic deafness
• Mutation in chloride-iodide transport protein
“Pendrin”
– Expressed in thyroid & cochlea
• Presents as euthyroid goiter, deafness
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Congenital hypothyroidism with goiter due to maternal PTU.
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Congenital hypothyroidism
• Maternally transmitted TSH receptor- blocking
antibodies (TRB-Ab) can be a cause of transient
congenital hypothyroidism
• Incidence approximately 1,100,000
• Transient congenital hypothyroidism resolves in
4-12 weeks
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MANAGEMENT OF CONGENITAL
HYPOTHYROIDISM
• Documentation
– Free T4, TSH
• Thyroid scan, ultrasound (optional)
• Treatment (normal size full term)
– start L-thyroxin at 10-15mcg/Kg daily
– Monitor TSH every 2-3 months during first 2
years of life.
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SYMPTOMS OF ACQUIRED
HYPOTHYROIDISM
• Weakness
• Lethargy
• Decreased appetite
• Cold intolerance
• Constipation
• Weight gain
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SIGNS OF ACQUIRED
HYPOTHYROIDISM
• Goiter
• Growth failure
• Delayed dentition
• Delayed or precocious puberty
• Galactorrhea
• Carotenemia
• Pale dry skin
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Girl with TSH
of 366.51
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Acquired hypothyroidism Treated hypothyroidism
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All forms of thyroid disease
are more common in
children with Down
syndrome.
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EVALUATION OF ACQUIRED
HYPOTHYROIDISM
• Documentation
– TSH
– Free T4
– Microsomal antibodies
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TREATMENT OF ACQUIRED
HYPOTHYROIDISM
• L-thyroxine
– start with a low dose
– 0.025 or 0.05 mg daily
• Monitor TSH level every 4 - 6 weeks
• Increase L-thyroxine by 0.0125 mg
increments until TSH is normal.
• Monitor TSH every 6 months
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Euthyroid Sick Syndrome
• Changes in thyroid function occur within 12 hours
of illness
• The lower the T3 the more severe the illness
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Euthyroid Sick Syndrome
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Wajner ,MaiaNew insights toward the acute non-thyroidal illness syndrome
Front. Endocrinol., 26 January 2012
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SICK EUTHYROID SYNDROME
T4 T3 rT3 TSH
Sick euthyroid Low Low High Low or Normal
Hypothyroidism
Low
Low
Low
High
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CAUSES OF HYPERTHYROIDISM
• Excess production of T4– Graves’ disease
– toxic adenoma
– pituitary resistance to T4
– McCune-Albright syndrome
– TSH receptor mutations
– TSH producing pituitary tumor
• Excess release of T4– Subacute thyroiditis
– Hashimoto’s toxic thyroiditis
– iodine induced hyperthyroidism
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SIGNS AND SYMPTOMS OF GRAVES’
DISEASE IN ADOLESCENTS
• 98% goiter
• 82% tachycardia
• 82% nervousness
• 80% increased pulse pressure
• 65% proptosis
• 60% increased appetite
• 52% tremor
• 50% weight loss
• 30% heat intolerance
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Graves’ disease
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EVALUATION OF
HYPERTHYROIDISM
• Documentation
– Free T4, TSH
• Determine etiology
– thyroid stimulating immunoglobulins
– radioactive iodide uptake scan
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TREATMENT OF GRAVES’
DISEASE
• Antithyroid medications
– PTU 5-10 mg/Kg divided t.i.d.
• Not recommended due to liver toxicity
– Methimazole 0.5-1 mg/Kg daily
• 131I radioactive ablation
• Thyroidectomy
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SIDE EFFECTS OF ANTITHYROID
DRUGS
• Rash
• Nausea
• Headache
• Puritis
• Lupus
• Arthritis
• Alopecia
• Hepatic toxicity
• Agranulocytosis
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Anti-idiotype antibody
It is possible to make an antibody that is directed against
the antigen binding site of another antibody (i.e., the antigen
binding site is the epitope). This type of antibody is called an
anti-idiotype antibody. In this case, the antigen binding site
of the anti-idiotype antibody can be similar in structure to the
original antigen (they both recognize the same antibody.)
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Neonatal
Graves’
Disease
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Fetal Thyroid Dynamics
• Early in gestation T4 crosses the placenta from
mother to fetus
• Late in gestation fetal T4 is almost exclusively
from fetus
• Fetus makes T4 prior to TSH
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Thyroid Autoantibodies in Pregnancy
• Up to 20% of pregnant mothers have thyroid
autoantibodies
• Risk from thyroid autoantibodies
– Maternal hypothyroidism
– Preeclampsia
– Placental abruption
– IUGR
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Neonatal Thyrotoxicosis• Life threatening neonatal emergency
• 10% of infants born to mother with Graves disease have
increased thyroid hormone
• Neonatal thyrotoxicosis occurs in 1-2% of neonates born to
mothers with Graves disease
• Due to transplacental passage of TSI
• Mother can have active or inactive Graves
• All mothers should have TSI levels done at end of 2nd trimester
• TSI greater than 500% strongly correlated
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Neonatal Thyrotoxicosis
• Onset is usually day 2-9 of life
• If Thyrotropin Binding Inhibitory
Immunoglobulins (TBII)) also present can be
delayed for 4-6 weeks
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SIGNS AND SYMPTOMS OF
NEONATAL GRAVES’ DISEASE
• Premature birth
• Low birth weight
• Goiter
• Restlessness and irritability
• Fever, flushing
• Tachycardia, cardiomegally, heart failure
• Lid retraction, proptosis, periorbital edema
• Poor weight gain, or weight loss
• Increased gastrointestinal motility, frequent stooling
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Neonatal Graves’ disease
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Question- Neonatal Hyperthyroidism
• A baby girl born at term weighing 3500 gm. No prenatal problems
or problems with delivery. She is now 14 hours old and has a
blood sugar 30 mg/dl and is jittery and irritable. In retrospect you
find that mother had Graves disease and underwent total
thyroidectomy 8 years ago. You suspect neonatal Graves’ disease
and order which of the following?
• A. Thyroid Ultrasound
• B. Serum thyroglobulin
• C. TPO antibodies
• D. Cord blood TSH, thyroid stimulating immunoglobulin
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Question 2-Neonatal Graves
• What would you use to treat this baby?
A. Lugol Solution
B. Methimazole
C. Levothyroxine
D. Glucocorticoids
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TREATMENT OF NEONATAL
GRAVES’ DISEASE
• Acutely may require beta-blocker, prednisone and Lugol’s solution.
• Methimazole 0.5 – 1mg/Kg daily
– Goal is to completely suppress the thyroid gland
• Must give L-thyroxin
– Usually start 25mcg daily
• Adjust to keep free T4 and TSH in normal range
• Treat for 6 months
– Maternal antibodies will be cleared by that time
– Stop Methimazole and L-thyroxin at same time.
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SUBACUTE THYROIDITIS
• Physical exam
– painful swelling of the thyroid
– signs of hyperthyroidism
• Laboratory evaluation
– high T4, low TSH, high ESR, absent TSI
– decreased radioactive iodide uptake scan
• Treatment
– beta blockers
– ASA, glucocorticoids
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Exogenous Thyroid Hormone
• High free T4, high T4, high T3, low TSH
• Can you test for this?
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Exogenous Thyroid Hormone
• plasma thyroglobulin level will be undetectable or
extremely low in patients chronically abusing
thyroid hormone
• may be used to differentiate cause
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Autonomous Thyroid Nodule
• Functions independent of normal pituitary control
• Occur from somatic mutations in either the alpha subunit of the G-protein or TSH receptor
• Mutation results in constitutive activation of adenylyl cyclase and unregulated production of cAMP
• Rare in children
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Autonomous Thyroid Nodules
• Radionuclide image using I-123 can help
differentiate between a hot or cold nodule
• Hot nodule will accumulate radioisotope in the
nodule and decreased or absent uptake in the
surrounding tissue
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McCune-Albright Syndrome
• Single or multiple hyperfunctioning adenomatous
nodules
• Usually between 3-12 years
• Equal in boys and girls
• Overproduction of LH, FSH, TSH, GHRH,
ACTH, and PTH seen in MAS are all receptors
that are couple to G-proteins
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McCune-Albright Syndrome
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McCune-Albright Syndrome
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Thyroid
nodule
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Thyroid Nodules
• 1% of Children
• 26% of thyroid nodules in children are malignant
• US & FNA best tools to identify cancer
• most benign nodules remain benign
• Prevalence of nodules is greater following radiation
exposure
• Majority of thyroid cancers in children are papillary
thyroid cancer
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THYROID NODULES IN CHILDREN
Carcinoma Adenoma
35% 52% Hayles 1956
20% 25% Adams 1968
40% 24% Kirkland 1973
17% 58% Scott 1976
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Question -Thyroid Nodules
• 15 year old female with 2.8 cm palpable firm mass in the
right lobe of the thyroid gland. There is no fever,
erythema or tenderness. The free T4 and TSH are
normal. Microsomal antibodies are positive. What tests
would you order?
a) Thyroglobulin antibody
b) Thyroid ultrasound
c) Serum calcitonin
d) 131 iodine uptake and scan
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M.E.N. SYNDROMES
• M.E.N. 1
– parathyroid, pituitary, and pancreatic adenomas
• M.E.N. 2a
– medullary thyroid carcinoma, pheochromocytoma,
parathyroid adenoma
• M.E.N. 2b
– medullary thyroid carcinoma, pheochromocytoma,
mucosal neuromas, intestinal neuromal dysplasia,
marfanoid habitus
• Familial medullary thyroid carcinoma
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M.E.N. 2
• M.E.N. 2a
– Due to mutations in the extra-cellular region of the RET receptor.
– Usually autosomal dominate inheritance.
– Recommend thyroidectomy at age 3 years.
• M.E.N. 2b
– Due to mutations in the intra-cellular region of the RET receptor.
– Usually sporadic mutations.
– Earlier development of medullary thyroid cancinoma.
– Thyroidectomy done as soon as diagnosis made.
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MEN 2b
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EXPECTED BLOOD TEST RESULTS IN
PEDIATRIC THYROID DISEASECondition Free T4 TSH Antibodies
Congenital hypothyroidism athyrotic nonathyrotic
low normal / low
high high
Acquired hypothyroidism
normal / low
high
microsomal
Euthyroid sick syndrome
low
normal/ low
absent
Graves’ disease
high
low
T.S.I.
Subacute thyroiditis
high
low
absent
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Question 1
A 16 y.o. girl complains of weight loss,
nervousness and tenderness in her anterior
neck. Which of the following will clearly
differentiate Graves’ disease from subacute
thyroiditis?
A Free T4
B T3
C TSH
D radioactive iodide uptake scan
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Question 2
Which of the following medications is NOT
helpful in treating subacute thyroiditis?
A PTU
B Propanolol
C Aspirin
D Prednisone
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Question 3
A goiter (thyroid enlargement) is usually NOT
present in which of the following?
A Hashimoto’s thyroiditis
B Congenital hypothyroidism
C Graves’ disease
D Subacute thyroiditis
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Question 4
A 15 y.o. girl complains of constipation,
tiredness and galactorrhea. On exam you note
an enlarged firm thyroid gland. What is the
most cost effective blood test to confirm your
suspicion of hypothyroidism?
A TSH
B T4, TSH, microsomal antibodies
C Free T4, TSH, prolactin
D T4, T4RU, TSH, thyroglobulin antibodies
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Question 5
A child’s father has M.E.N. 2. Which
screening test should be performed?
A Fasting calcitonin level
B Calcitonin level after calcium infusion
C 24 hour urine for metanephrines
D Genetic testing on both the father and child
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Question 6
This boy has:
A) just broken a neighbor’s
window with his baseball
B) just watched the movie
“Halloween”
C) subacute thyroidits
D) Graves’ eye disease
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Graves Opthalmopathy
• clinically evident in over half of children and adolescents
• Usually mild
• may include
– lid lag
– lid retraction
– stare, proptosis
– conjunctival injection,
– periorbital edema
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Graves Opthalmopathy
• explained by mechanical effects of an increase in tissue volume within the bony orbit
• caused by accumulation of glycosaminoglycans (GAGs) in the connective tissue of the orbital fat and muscles
• Orbital fibroblasts are the primary targets of the autoimmune attack and thought to share similar antigen structure with thyroid
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Graves Opthalmopathy
• treatment not needed for mild cases
• eye drops or ointment needed to prevent corneal drying
• severe ophthalmopathy
– Oral corticosteroids
– orbital irradiation
– surgical decompression
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Question 7.
An adolescent female
complains about her tall
stature. On physical exam
you notice some nodules on
her lips and tongue. She has
a history of severe
constipation. No other family
members have similar
problems or findings.
What is your next step.
A. Obtain RET mutation
analysis
B. Exam patient’s parents.
C. Obtain calcitonin and CEA
levels
D. Obtain Ca++ and PTH levels.
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