Goitre

Last updated

Goitre
Other namesGoiter
Thyroid, Diffuse Hyperplasia.jpg
Diffuse hyperplasia of the thyroid
Specialty Endocrinology
Causes Iodine deficiency, autoimmune disease, tumors, cyanide poisoning

A goitre (British English), or goiter (American English), is a swelling in the neck resulting from an enlarged thyroid gland. [1] [2] A goitre can be associated with a thyroid that is not functioning properly.

Contents

Worldwide, over 90% of goitre cases are caused by iodine deficiency. [3] The term is from the Latin gutturia, meaning throat. Most goitres are not cancerous (benign), though they may be potentially harmful.

Signs and symptoms

A goitre can present as a palpable or visible enlargement of the thyroid gland at the base of the neck. A goitre, if associated with hypothyroidism or hyperthyroidism, may be present with symptoms of the underlying disorder. For hyperthyroidism, the most common symptoms are associated with adrenergic stimulation: tachycardia (increased heart rate), palpitations, nervousness, tremor, increased blood pressure and heat intolerance. Clinical manifestations are often related to hypermetabolism (increased metabolism), excessive thyroid hormone, an increase in oxygen consumption, metabolic changes in protein metabolism, immunologic stimulation of diffuse goitre, and ocular changes (exophthalmos). [4] Hypothyroid people commonly have poor appetite, cold intolerance, constipation, lethargy and may undergo weight gain. However, these symptoms are often non-specific and make diagnosis difficult.[ citation needed ]

According to the WHO classification of goitre by palpation, the severity of goitre is currently graded as grade 0, grade 1, grade 2. [5]

Causes

Worldwide, the most common cause for goitre is iodine deficiency, commonly seen in countries that scarcely use iodized salt. Selenium deficiency is also considered a contributing factor. In countries that use iodized salt, Hashimoto's thyroiditis is the most common cause. [6] Goitre can also result from cyanide poisoning, which is particularly common in tropical countries where people eat the cyanide-rich cassava root as the staple food. [7]

CausePathophysiologyResultant thyroid activityGrowth patternTreatmentIncidence and prevalencePrognosis
Iodine deficiency Hyperplasia of thyroid to compensate for decreased efficacyCan cause hypothyroidism DiffuseIodineConstitutes over 90% cases of goitre worldwide [3] Increased size of thyroid may be permanent if untreated for around five years
Congenital hypothyroidism Inborn errors of thyroid hormone synthesis Hypothyroidism
Goitrogen ingestion
Adverse drug reactions
Hashimoto's thyroiditis Autoimmune disease in which the thyroid gland is gradually destroyed. Infiltration of lymphocytes.HypothyroidismDiffuse and lobulated [8] Thyroid hormone replacement Prevalence: 1 to 1.5 in a 1000Remission with treatment
Pituitary disease Hypersecretion of thyroid stimulating hormone, almost always by a pituitary adenoma [9] DiffusePituitary surgeryVery rare [9]
Graves' disease—also called Basedow syndrome Autoantibodies (TSHR-Ab) that activate the TSH-receptor (TSHR) Hyperthyroidism Diffuse Antithyroid agents, radioiodine, surgeryWill develop in about 0.5% of males and 3% of femalesRemission with treatment, but still lower quality of life for 14 to 21 years after treatment, with lower mood and lower vitality, regardless of the choice of treatment [10]
Thyroiditis Acute or chronic inflammation Can be hyperthyroidism initially, but progress to hypothyroidism
Thyroid cancer Usually uninodularOverall relative 5-year survival rate of 85% for females and 74% for males [11]
Benign thyroid neoplasms Usually hyperthyroidismUsually uninodularMostly harmless [12]
Thyroid hormone insensitivity Secretional hyperthyroidism,
Symptomatic hypothyroidism
Diffuse

Diagnosis

Goitre with toxic adenoma Struma 004.jpg
Goitre with toxic adenoma

Goitre may be diagnosed via a thyroid function test in an individual suspected of having it. [13]

Types

A goitre may be classified either as nodular or diffuse. Nodular goitres are either of one nodule (uninodular) or of multiple nodules (multinodular). [14] Multinodular goiter (MNG) is the most common disorder of the thyroid gland. [15]

Growth pattern
Size

Treatment

Goitre is treated according to the cause. If the thyroid gland is producing an excess of thyroid hormones (T3 and T4), radioactive iodine is given to the patient to shrink the gland. If goitre is caused by iodine deficiency, small doses of iodide in the form of Lugol's iodine or KI solution are given. If the goitre is associated with an underactive thyroid, thyroid supplements are used as treatment. Sometimes a partial or complete thyroidectomy is required. [19]

Medical and scientific developments

The discovery of iodine's importance in thyroid function and its role in preventing goiter marked a significant medical breakthrough. The introduction of iodized salt in the early 20th century became a key public health initiative, effectively reducing the prevalence of goiter in previously affected regions. This measure was one of the earliest and most successful examples of mass preventive health campaigns. [20]

Epidemiology

Disability-adjusted life year for iodine deficiency per 100,000 inhabitants in 2002.
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no data
fewer than 50
50-100
100-150
150-200
200-250
250-300
300-350
350-400
400-450
450-500
500-800
more than 800 Iodine deficiency world map - DALY - WHO2002.svg
Disability-adjusted life year for iodine deficiency per 100,000 inhabitants in 2002.
  no data
  fewer than 50
  50–100
  100–150
  150–200
  200–250
  250–300
  300–350
  350–400
  400–450
  450–500
  500–800
  more than 800

Goitre is more common among women, but this includes the many types of goitre caused by autoimmune problems, and not only those caused by simple lack of iodine. [22]

Iodine mainly accumulates in the sea and in the topsoil. Before iodine enrichment programs, goiters were common in areas with repeated flooding or glacial activities, which erodes the topsoil. It is endemic in populations where the intake of iodine is less than 10 μg per day. [23]

Examples of such regions include the alpine regions of Southern Europe (such as Switzerland), the Himalayans, the Great Lakes basin, etc. As reported in 1923, all the domestic animals have goiter in some of the glacial valleys of Southern Alaska. It was so severe in Pemberton Meadows that it was difficult to raise young animals there. [24]

History

Goitre and congenital iodine deficiency syndrome in Styria, copper engraving, 1815 Cretinnen aus Steiermark, 1819 gez. Loder, gest. Leopold Muller.jpg
Goitre and congenital iodine deficiency syndrome in Styria, copper engraving, 1815
Woman in Miesbacher Tracht wearing a goitre choker Miesbacher gebirgstracht frau.jpg
Woman in Miesbacher Tracht wearing a goitre choker

Chinese physicians of the Tang dynasty (618–907) were the first to successfully treat patients with goitre by using the iodine-rich thyroid gland of animals such as sheep and pigs—in raw, pill, or powdered form. [25] This was outlined in Zhen Quan's (d. 643 AD) book, as well as several others. [25] One Chinese book, The Pharmacopoeia of the Heavenly Husbandman, asserted that iodine-rich sargassum was used to treat goitre patients by the 1st century BC, but this book was written much later. [25]

In the 12th century, Zayn al-Din al-Jurjani, a Persian physician, provided the first description of Graves' disease after noting the association of goitre and a displacement of the eye known as exophthalmos in his Thesaurus of the Shah of Khwarazm, the major medical dictionary of its time. [26] [27] The disease was later named after Irish doctor Robert James Graves, who described a case of goitre with exophthalmos in 1835. The German Karl Adolph von Basedow also independently reported the same constellation of symptoms in 1840, while earlier reports of the disease were also published by the Italians Giuseppe Flajani and Antonio Giuseppe Testa, in 1802 and 1810 respectively, [28] and by the English physician Caleb Hillier Parry (a friend of Edward Jenner) in the late 18th century. [29]

Paracelsus (1493–1541) was the first person to propose a relationship between goitre and minerals (particularly lead) in drinking water. [30] Iodine was later discovered by Bernard Courtois in 1811 from seaweed ash. [31]

Goitre was previously common in many areas that were deficient in iodine in the soil. For example, in the English Midlands, the condition was known as Derbyshire Neck. In the United States, goitre was found in the Appalachian, [32] [33] Great Lakes, Midwest, and Intermountain regions. The condition is now practically absent in affluent nations, where table salt is supplemented with iodine. However, it is still prevalent in India, China, [34] Central Asia, and Central Africa.

Goitre had been prevalent in the alpine countries for a long time. Switzerland reduced the condition by introducing iodized salt in 1922. The Bavarian tracht in the Miesbach and Salzburg regions, which appeared in the 19th century, includes a choker, dubbed Kropfband (struma band) which was used to hide either the goitre or the remnants of goitre surgery. [35]

In various regions around the world, particularly in mountainous areas, the prevalence of goiter was linked to iodine deficiency in the diet. For example, the Alps, the Himalayas, and the Andes had high rates of goiter due to the iodine-poor soil. In these regions, iodine deficiency led to widespread hormonal imbalances, particularly affecting thyroid function. [36]

Society and culture

In the 1920s wearing bottles of iodine around the neck was believed to prevent goitre. [37]

Notable cases

Heraldry

The coat of arms and crest of Die Kröpfner, of Tyrol, showed a man "afflicted with a large goitre", an apparent pun on the German for the word ("Kropf"). [41]

Social Impacts

In some historical contexts, goiters were so prevalent that they became normalized within the culture. For instance, in certain Alpine regions, large goiters were sometimes considered a sign of beauty. Conversely, in other areas, individuals with goiters faced social stigma, which could lead to marginalization and discrimination. [42]

Summarization

Goiter, resulting primarily from iodine deficiency, has historically been a widespread condition with significant health and social implications. Advances in nutrition and public health have greatly reduced its prevalence, but understanding its historical context helps in appreciating the development of endocrinology and public health measures.[ citation needed ]

See also

References

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