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Doctor insights on: Thyroid Irradiation

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Thyroid cancer treatments?

Thyroid cancer treatments?

Surgery: Surgery is needed, followed by thyroid hormone replacement. Depending on how big, what type and whether or not it had spread (lymph nodes involvement), you might also need 1 dose of radioactive iodine. Good luck. Make sure you have a good surgeon and an endocrinologist on your team. ...Read more

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Irradiation (Definition)

Irradiation is the process by which an object is exposed to radiation. The exposure can originate from various sources, including natural sources. Most frequently the term refers to ionizing radiation, and to a level of radiation that will serve a specific purpose, rather than radiation exposure to normal ...Read more


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What is the significance of radioactive iodine scan in various throid diseases like myxedema, hashimoto's thyroiditis and graves disease?

What is the significance of radioactive iodine scan in various throid diseases like myxedema, hashimoto's thyroiditis and graves disease?

Hot vs. cold nodule: Iodine uptake by thyroid tissue depends on functioning cells. The most common use for thyroid scan is to assess if a nodule is functional or not. A functional/hot nodule may cause hyperthyroidism but is not likely to be malignant. See this site for more info. http://www.nlm.nih.gov/medlineplus/ency/article/003829.htm. ...Read more

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What food contains iodine needed for the thyroid gland's production of thyroid hormone?

What food contains iodine needed for the thyroid gland's production of thyroid hormone?

Many foods: The us diet has adequate i levels both in the food and added as stabilizers in many foods and other products as toothpaste and shampoos. If you are hypothyroid you need thyroid hormone in this country. ...Read more

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What percentage of radio active thyroid iodine patients lose all thyroid function?

What percentage of radio active thyroid iodine patients lose all thyroid function?

Depends on dose: For graves disease, typical doses of rai are 5-25 mci. The dose depends on your uptake and size of gland. Some doctors give low doses to try to make your thyroid normal. But this usually does not work. Either the low dose leaves you still hyperthyroid, or it makes you hypo, just like a higher dose. For this reason, many just give a high-ish dose so you become hypo quickly and go on synthroid (thyroxine). ...Read more

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Will thyroid hormones or antithyroid medications interfere with a tc99m pertechnetate thyroid scan?

Will thyroid hormones or antithyroid medications interfere with a tc99m pertechnetate thyroid scan?

Not usually: Technetium is usually trapped by thyroid gland and used to determine in young children and infants the configuration of thyroid gland, hypoplasia, absence, or increased size or hyperplasia, or abnormal location. Radioactive iodine is used in older patients for determine function of thyroid gland, increased function or hyperthyroiidism or decreased function, hypothyroidism. ...Read more

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Radioactive iodine versus partial thyroidectomy, explain please?

Radioactive iodine versus partial thyroidectomy, explain please?

Need more info: Radioactive iodine is often used for graves' disease which is a hyperactive thyroid condition. I am assuming you were given this option or partial thyroid removal to control the problem. The radioactive therapy is usually preferred but sometimes surgery is better depending on many issues. You need to discuss with endocrinologist and surgeon. ...Read more

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I have low iodine diet before radio iodine treatment for thyroid cancers?

I have low iodine diet before radio iodine treatment for thyroid cancers?

Pre-treatment: You are on low iodine diet to keep normal iodine from competing with radio-iodine and interfering with the concentration of radio-iodine in the thyroid cancer. Wish you good health. ...Read more

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Can thyroid cancer cause hyperthyroidism?

Unusual: Most thyroid cancers do not produce excess thyroid hormone. Very rarely, a single nodule can produce excess hormone and be cancerous, but those are very unusual. ...Read more

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Test results are multinodular goiter so radionuclide thyroid scan?

Test results are multinodular goiter so radionuclide thyroid scan?

Need more info: Not sure what you mean by "test results" but u cannot know that u have multinodular goiter from a blood test. A thyroid ultrasound can give u this diagnosis in which case u will need a blood test called TSH to know what to do next. No thyroid scan needed unless the TSH is low. Thyroid ultrasound vs. Biopsy might be needed depends on the size and characteristics of the nodules but need more info. ...Read more

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So continuous radiation that focuses on thyroid CT scans and radioactive dye from pet scans can't destroy someone's thyroid gland causing it to fail ...Leading to hypothyroid issues ?

So continuous radiation that focuses on thyroid  CT scans and radioactive dye from pet scans can't destroy someone's thyroid gland causing it to fail ...Leading to hypothyroid issues ?

Quantity is the ?: Radiation exposure is cummulative and partly time interval of exposure related . I don't want to avoid your ? , but what do u mean by continuous ? I am not famililiar with continuous exposure in diagnostic radiology. ...Read more

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Can radiation therapy fix my overactive thyroid gland?

Can radiation therapy fix my overactive thyroid gland?

Yes: In the form of radioactive iodine 131 radiation is given by a one time capsule that targets the thyroid. This may overkill the gland and one then needs replacement medicine but at least the dose can be adjusted. ...Read more

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Will the radioactive iodine capsule work for my thyroid uptake scan?

Will the radioactive iodine capsule work for my thyroid uptake scan?

YES: An uptake value will be established. Uptake can be low, normal, or high. Scan will be diagnostic if enough iodine localizes in the thyroid gland. Large amounts of stable iodine from iodized salt and ocean seafood can compete with radiodine and decrease uptake. ...Read more

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Can all food contain iodine needed for the thyroid gland's production of thyroid hormone?

Can all food contain iodine needed for the thyroid gland's production of thyroid hormone?

Variable amounts: Plant food sources contain variable amounts of iodine, depending on the soil content of this mineral. In us you may use iodized salt that would cover the requirement. ...Read more

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How is the rai dosage determined for metastatic papillary thyroid cancer?

Several factors: Amount of rai dose is caliculated , based on several factors, age, sex, body weight , extent of disease, blood levels reaching less than bone marrow toxic dose of lees than 200 rad . Dose varies li greater than 1.10 (30mci) most of the doctors will not bother to know as the expert radiotherapists doctors who are specially trained will calculate and administer ri. ...Read more

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Thyroid nodule of the right lobe. Fna indicated follicular lesion-also hypothyroid, family history of malignant thyroid nodules. Options?

Thyroid nodule of the right lobe. Fna indicated follicular lesion-also hypothyroid, family history of malignant thyroid nodules. Options?

Surgery or...: A repeat biopsy combined with an afirma assay test may give you somewhat better guidance, but with your history and risk factors, surgery may be the best option. By the way, why are you taking generic T4 an Armour Thyroid together? There is no way to monitor the dosage properly as the lab tests will be unreliable. Brand name T4 is better, safer and more reliable. ...Read more

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Can 50mcg of Synthroid (thyroxine) make thyroid nodules grow?

Can 50mcg of Synthroid (thyroxine) make thyroid nodules grow?

NO: Thyroid supplementation occasionally can help to shrink a nodule, and has been used to suppress the growth. ...Read more

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Thyroid swelling. Ultrasound heterogenous thyroid parynchema with hypervascularity. Blood test-normal tsh t4 t3 (liothyronine) etc but >1300 TPo antibodies?

Thyroid swelling. Ultrasound heterogenous thyroid parynchema with hypervascularity. Blood test-normal tsh t4 t3 (liothyronine) etc but >1300 TPo antibodies?

Hard to say: Ive yet to have anyone NOT have elevated TPo but I havent sent many. The standard answer would be that it likley is GRAVES disease starting but if there arent a lot of symptoms and the labs are normal you wouldnt give treatment. Retesting if symptoms and at about every 3 months. ...Read more

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What medications treat follicular adenoma thyroid nodules?

What medications treat follicular adenoma thyroid nodules?

None: Medications are not used to treat follicular thyroid nodules. Usually they are observed only or removed surgically. ...Read more

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To ablate remnant tissue after complete thyroidectomy(initially had multiple noduls, 1-ca node), what maximum dose of radioactive iodine be taken?

Depends: The dose is related to the risk of recurrent disease. The larger the primary tumor, the higher the risk. In your age group (under 45 yo) the risk is relatively low, even with having a positive lymph node. The recommended dose would be as low as 30 mci or as high as 100. ...Read more

Dr. Jan Lei Iwata
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more