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Difference Between Solid Thyroid Gland Nodule and Simple Fluid-Filled Sac

August 4, 2011 Posted by Dr.Dinusha

Solid Thyroid Gland Nodule vs Simple Fluid-Filled Sac

The thyroid gland is an important endocrine organ in the human body, and it secretes thyroxine (T4) and tri-iodothyronine (T3), which in turn helps to maintain the metabolic functions of the human body, along with proper development of the human body at early stages and  adequate neural development in the cortex. The thyroid gland consists of a major component of roughly spherical follicles lined by cuboidal to columnar epithelial cells and with a thyroglobulin rich colloid. It also contains para follicular cells to a lesser extent, which secretes the hormone calcitonin. These cells may proliferate either in a controlled, predictable fashion or in an unpredictable, malignant fashion to produce carcinomas. So, the differences we see in the discussion here would be based on the histology, content, and probable outcome of the conditions.

Solid Thyroid Gland Nodule

An isolated or discrete thyroid nodule can be either a solitary nodule at 70% of the time or a dominant one among a multitude at 30% of the time. The chance of an isolated thyroid swelling being solid is 24%, and they are at risk of being malignant. They are more common in females, but they cause greater threat to the males. The symptoms of the condition would be relative to the activity level of the thyroid gland, the pressure exerted by the nodule, and the level of invasion by the malignant cells causing, hoarseness of voice, Horner’s syndrome, etc. First start off by detecting the thyroid activity by looking in to the T4 and TSH levels. Then an ultrasound scan could be done. It would confirm whether it is actually a solid singular nodule or not, and the level of vascularity and the levels of local extensions. A radioiodine scan will reveal if it is a hot or a cold nodule. Cold nodules have higher propensity to become malignant. Management will be dependent on if it is malignant or benign. Benign ones will be managed with medications and surgery, and the malignant ones will be managed through extensive surgery with post surgical radioiodine therapy with supplementation of any thyroidal deficits.

Simple Fluid-Filled Sac

A simple fluid filled sac is more common in smaller age groups, and they are usually the thyroglosal cysts. Some of these cysts are degenerated nodules, and may be complex or simple containing only fluid. The symptoms of these entities will be same as the solid nodules as the cysts maybe covered by a hardened capsule. And only through investigations such as ultrasound and fine needle aspiration do we get to know the contents of the cyst. Sometimes these nodules may bleed and cause extreme pain. But the simple fluid filled sacs do not become malignant, unless there are solid components in the cyst as well. Surgery is not required as these tend to recur. The treatment will consist of ultrasound guided aspiration and using a sclerosant like tetracycline to obliterate any empty spaces.

Difference Between Solid Thyroid Gland Nodule and Simple Fluid-Filled Sac

In considering these two thyroidal diseases entities, they occur as singular structure and would have similar pressure symptoms. But, cysts do not have thyroidal excess or deficit features, and one is completely solid, whereas the other is most of the time completely fluid. The USS, FNAC, and radioiodine scans can differentiate between the two. The solitary nodules do have a higher probability of becoming malignant than the cysts. The nodules need specific management with surgery, whereas the cysts do not need surgery.

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Filed Under: Diseases Tagged With: calcitonin, Cold nodules, FNAC, hot nodules, malignant nodule, nodules, radioiodine scan, radioiodine therapy, simple fluid filled sac, Solid Thyroid Gland Nodule, thyroglosal cysts, thyroid, thyroid gland, thyroid nodule, thyroidal deficits, thyroidal diseases, thyroxine, treatment, tri-iodothyronine, ultrasound scan, USS

About the Author: Dr.Dinusha

Dr.Dinusha is currently a Senior Registrar in Psychiatry and holds an MD in Psychiatry. He is also a Lecturer and an Examiner for nursing students and a Visiting Lecturer in Pathology.

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