Pediatric Thyroid Cancer Follow-up

  • Author: Mark E Gerber, MD, FACS, FAAP; Chief Editor: Arlen D Meyers, MD, MBA   more...
 
Updated: Apr 5, 2011
 

Further Inpatient Care

Serum calcium levels are measured daily for the first 2-4 postoperative days in all patients who have undergone a total or subtotal thyroidectomy. The calcium level usually drops slightly (to about 7 mg/dL) as the remaining parathyroid tissue recovers from surgical trauma. Mild hypocalcemia of this level requires treatment only if symptomatic. Mild symptoms include a positive Trousseau or Chvostek sign, mild cardiac arrhythmia, or perioral tingling. Treatment of these mild symptoms requires only oral calcium combined with vitamin D. Intravenous calcium gluconate is used for a more rapid replacement with severe arrhythmia or impending tetany.

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Further Outpatient Care

Postoperative therapy

  • Radioactive iodine (RAI) therapy should be administered to all children and young adults with cervical lymphadenopathy after a total thyroidectomy to reveal and treat all distant metastases in the lungs.[12]
  • Thyroid hormone replacement with levothyroxine is started in the first few days after total thyroidectomy. This replacement is withheld in patients who will receive131 I therapy.131 I is administered only to patients with extensive neck disease or distant metastases.
  • Cytomel or synthetic T3 is often used in place of levothyroxine prior to a postoperative nuclear scan or radioactive iodine (RAI) treatment. Cytomel has a shorter half-life, minimizing the period in which no suppression or replacement occurs and maximizing the uptake of radionuclide used in the scan or radioiodine therapy. A control thyroid scan is usually performed 2-3 weeks after surgery or radioiodine therapy. TSH-suppressive doses (150-200 mcg/d of T4) are thought to decrease recurrence in differentiated carcinomas.[10]
  • Thyroid carcinoma has been found to recur up to 33 years after treatment. Patients should receive close follow-up care with pulmonary function tests, chest radiography, CT scans, and thyroid function tests.[58] Thyroglobulin levels should be monitored for indications of medullary carcinoma.
  • Postoperative local external beam radiation is not recommended because of a possible carcinogenic effect in children.
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Inpatient & Outpatient Medications

Perioperative antibiotics are often used, and postoperative pain medications are standard, in addition to suppressive or replacement T4.

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Complications

Surgical complications include recurrent laryngeal nerve injury, hypoparathyroidism, hypothyroidism, and wound infection.

  • The most common complication of a total thyroidectomy in children is parathyroid gland injury. In 6-15% of patients, parathyroid gland injury results in permanent hypoparathyroidism.[56, 22, 39]
  • Hypothyroidism in all patients after total thyroidectomy is avoided with thyroid hormone replacement.
  • Hypothyroidism occurs in 6.5-49% of patients who have undergone subtotal thyroidectomy.
  • Secondary operations are more hazardous.[54]
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Prognosis

Whereas the degree of invasion and metastases corresponds to prognosis in adults, this relationship is not seen in the pediatric population. In fact, the presence of lymph nodes does not affect the prognosis in children and adolescents.[12] The reason for this is multifactorial and can be attributed to an overwhelming majority of well-differentiated cancers, low incidence of bone metastasis, and excellent response to RAI.

  • Bone metastasis also has a low incidence in childhood thyroid cancers, occurring in less then 5% of patients.
  • Individuals with radiation-induced thyroid cancer are at an increased risk for additional cancer later in life.[32]

Pediatric patients have higher local and distant recurrence rates than adults, but they tend to respond rapidly to therapy. The prognosis is excellent in children, with mortality rates of less than 10%.

The overall 20-year survival rate is 92-100%.

Some studies report young age as the major determinant of recurrence in pediatric-differentiated thyroid carcinoma, which suggests a difference in tumor biology.

Rearrangements in the ret protooncogene have been observed in those exposed to radiation, with a reported ret rearrangement rate between 50 and 70%.[21] Williams et al studied Chernobyl-induced thyroid tumor behavior and found that thyroid tumors associated with the ret and PTC3 oncogenes were more aggressive, faster growing, and less differentiated.[18] Thyroid tumors with the ret/PTC1 oncogene had more benign characteristics and were slower growing.

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Contributor Information and Disclosures
Author

Mark E Gerber, MD, FACS, FAAP  Clinical Assistant Professor of Otolaryngology, University of Chicago, Pritzker School of Medicine; Section Head, Pediatric Otolaryngology-Head and Neck Surgery, NorthShore University HealthSystem

Mark E Gerber, MD, FACS, FAAP is a member of the following medical societies: American Academy of Otolaryngology-Head and Neck Surgery, American Academy of Pediatrics, American Bronchoesophagological Association, American Cleft Palate/Craniofacial Association, American College of Surgeons, American Rhinologic Society, American Society of Pediatric Otolaryngology, and Society for Ear, Nose and Throat Advances in Children

Disclosure: Nothing to disclose.

Coauthor(s)

Brian Kip Reilly, MD  Assistant Professor of Otolaryngology and Pediatrics, Department of Otolaryngology, Children's National Medical Center, George Washington University School of Medicine

Brian Kip Reilly, MD is a member of the following medical societies: American Academy of Otolaryngology-Head and Neck Surgery

Disclosure: Nothing to disclose.

Specialty Editor Board

Russell A Faust, MD, PhD  Consulting Staff, Department of Otolaryngology, Columbus Children's Hospital

Russell A Faust, MD, PhD is a member of the following medical societies: American Academy of Otolaryngology-Head and Neck Surgery, American College of Legal Medicine, American Laryngological Rhinological and Otological Society, American Rhinologic Society, American Society for Head and Neck Surgery, and American Society of Law, Medicine & Ethics

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD  Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Senior Pharmacy Editor, eMedicine

Disclosure: eMedicine Salary Employment

Nader Sadeghi, MD, FRCS(C)  Professor of Surgery, Director of Head and Neck Surgery, George Washington University School of Medicine and Health Sciences

Nader Sadeghi, MD, FRCS(C) is a member of the following medical societies: American Academy of Otolaryngology-Head and Neck Surgery, American Head and Neck Society, Federation of Medical Specialists in Quebec, and Royal College of Physicians and Surgeons of Canada

Disclosure: Nothing to disclose.

Christopher L Slack, MD  Otolaryngology-Facial Plastic Surgery, Private Practice, Associated Coastal ENT; Medical Director, Treasure Coast Sleep Disorders

Christopher L Slack, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Facial Plastic and Reconstructive Surgery, American Academy of Otolaryngology-Head and Neck Surgery, and American Medical Association

Disclosure: Nothing to disclose.

Chief Editor

Arlen D Meyers, MD, MBA  Professor, Department of Otolaryngology-Head and Neck Surgery, University of Colorado School of Medicine

Arlen D Meyers, MD, MBA is a member of the following medical societies: American Academy of Facial Plastic and Reconstructive Surgery, American Academy of Otolaryngology-Head and Neck Surgery, and American Head and Neck Society

Disclosure: Covidien Corp Consulting fee Consulting; US Tobacco Corporation Unrestricted gift Unknown; Axis Three Corporation Ownership interest Consulting; Omni Biosciences Ownership interest Consulting; Sentegra Ownership interest Board membership; Syndicom Ownership interest Consulting; Oxlo Consulting; Medvoy Ownership interest Management position; Cerescan Imaging Honoraria Consulting; GYRUS ACMI Honoraria Consulting

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A monomorphous cell population of Hürthle cells arranged in loosely cohesive clusters and single cells. The cells are polyhedral and have abundant granular cytoplasm with well-defined cell borders. The nuclei are enlarged and have a central prominent macronucleolus.
 
 
 
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