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Thyroid and Parathyroid Cancers
Thyroid and parathyroid cancers both originate from endocrine glands located in the neck region; however, they differ significantly in their biological behavior, clinical presentation, and treatment approaches.
ℹWhat is Thyroid and Parathyroid Cancers?
Thyroid Cancer: The thyroid gland is a butterfly-shaped organ located in the anterior neck below the Adam's apple that controls metabolism. Thyroid cancers are classified into four main subtypes based on cell of origin:
- Papillary Carcinoma: The most common type (80-85%). Generally slow-growing with cure rates exceeding 90% when diagnosed early. Has a tendency for lymph node metastasis.
- Follicular Carcinoma: The second most common type (10-15%). Has a slightly higher propensity for hematogenous spread to lungs and bones.
- Medullary Carcinoma: Originates from calcitonin-secreting parafollicular C cells. Approximately 25% of cases are hereditary, associated with MEN syndromes. Family history is critically important.
- Anaplastic Carcinoma: The rarest but most aggressive, rapidly progressive subtype. Typically occurs in elderly patients.
Parathyroid Cancer: The parathyroid glands are four small, pea-sized glands located behind the thyroid that regulate calcium homeostasis. Parathyroid carcinoma is exceedingly rare, accounting for less than 1% of all parathyroid diseases. Malignant cells secrete excessive parathyroid hormone (PTH), causing dangerously elevated blood calcium levels (hypercalcemia).
Common Symptoms
Firm, Painless Neck Mass (Thyroid)
A palpable firm, painless mass or swelling in the neck is the most common presentation of thyroid cancer.
Hoarseness (Thyroid)
Unexplained voice changes resulting from tumor invasion of the recurrent laryngeal nerve.
Dysphagia (Thyroid)
A sensation of something stuck in the throat or difficulty swallowing.
Dyspnea (Thyroid)
Difficulty breathing due to tracheal compression in advanced cases.
Bone and Joint Pains (Parathyroid)
Calcium mobilization from bones leads to osteoporosis and pathological fractures.
Kidney Stones (Parathyroid)
Excess calcium excreted by the kidneys results in recurrent kidney stone formation.
Digestive Problems (Parathyroid)
Severe constipation, nausea, vomiting, and peptic ulcer disease are gastrointestinal manifestations of hypercalcemia.
Psychological Symptoms (Parathyroid)
Depression, confusion, and severe fatigue are neuropsychiatric effects of hypercalcemia.
Diagnosis Methods
Physical Examination and History (Thyroid)
Assessment of mass firmness, mobility, and regional lymph node status. Symptoms such as hoarseness are evaluated.
Ultrasonography (Thyroid)
The first and most important diagnostic step. Evaluates nodule margins, microcalcifications, and vascularity.
Fine Needle Aspiration Biopsy (Thyroid)
The confirmatory diagnostic method. Ultrasound-guided aspiration obtains cellular samples classified according to the Bethesda System.
Blood Tests (Thyroid)
TSH assesses thyroid function, Thyroglobulin is used for postoperative surveillance, and Calcitonin is measured when Medullary Thyroid Cancer is suspected.
Radioactive Iodine Scintigraphy (Thyroid)
Differentiates between hot (functioning) and cold (non-functioning) nodules. Cold nodules carry a higher malignancy risk.
Laboratory Tests (Parathyroid)
Serum calcium (typically ≥14 mg/dL), PTH levels (5-10 times normal), and Alkaline Phosphatase are measured.
Imaging (Parathyroid)
Sestamibi scintigraphy, neck ultrasonography, and 4D Computed Tomography (4D-CT) are used to localize the tumor.
Biopsy Contraindication (Parathyroid)
FNAB is generally avoided in suspected parathyroid carcinoma due to the risk of tumor capsule violation and needle tract seeding. Diagnosis relies on clinical findings and intraoperative assessment.
Causes
Radiation Exposure (Thyroid)
Prior radiation therapy to the head and neck, especially during childhood, significantly increases thyroid cancer risk.
Genetic Factors (Thyroid)
Family history of thyroid cancer or MEN syndromes are important risk factors. Approximately 25% of medullary thyroid cancers are hereditary.
Gender (Thyroid)
Women are 2-3 times more likely to develop thyroid cancer than men.
Genetic Mutations (Parathyroid)
Parathyroid carcinoma is rare with incompletely understood etiology. It has been associated with CDC73/HRPT2 gene mutations.
Treatments
Surgery (Thyroid)
Thyroidectomy (total or lobectomy) is the primary treatment. Cervical lymph node dissection is performed when nodal metastasis is present.
Radioactive Iodine Therapy (Thyroid)
Used after surgery in Papillary and Follicular types to ablate residual microscopic disease. Thyroid cells' ability to concentrate iodine allows targeted radiation delivery to cancer cells.
Hormone Replacement Therapy (Thyroid)
Since the thyroid gland is removed, patients use synthetic thyroid hormone (Levothyroxine) for life. This both compensates for the hormone deficiency and reduces the risk of recurrence by suppressing TSH.
Targeted Therapy (Thyroid)
Tyrosine Kinase Inhibitors (e.g., Lenvatinib, Sorafenib) are used for radioactive iodine-refractory, progressive thyroid cancers.
En Bloc Resection (Parathyroid)
Parathyroid cancer surgery is significantly more extensive: the involved gland, ipsilateral thyroid lobe, adjacent muscle tissue, and potentially regional nerves are resected en bloc. Maintaining tumor capsule integrity during surgery is critically important to prevent local recurrence.
Hypercalcemia Management (Parathyroid)
Intravenous fluids and bisphosphonates are administered to lower calcium levels. Calcimimetics help suppress excessive PTH secretion.
Prevention
Regular Check-ups (Thyroid)
Periodic neck examination and ultrasonography are recommended for individuals with a family history of thyroid cancer.
Genetic Screening (Thyroid)
RET proto-oncogene mutation testing is recommended for families with Medullary Thyroid Cancer or MEN syndrome history.
Radiation Avoidance
Unnecessary radiation exposure should be minimized.
Calcium Monitoring (Parathyroid)
No specific prevention exists due to the extreme rarity of parathyroid carcinoma; however, early medical evaluation of unexplained hypercalcemia is advised.