Diagnosing Medullary Thyroid Cancer

Overview

Medullary thyroid cancer (MTC) is a rare kind of thyroid cancer that starts in the thyroid gland, a small gland located in the front of your neck that sends out hormones to regulate the body. MTC begins when a specific type of thyroid cell, called a parafollicular or C cell, becomes cancerous and grows out of control.

To diagnose MTC, several examinations, screening tests, and procedures are typically performed. These help confirm the diagnosis and determine the type, severity, or stage of the cancer. Specialists involved in diagnosing MTC may include endocrinologists, otolaryngologists (ear, nose, and throat doctors), and pathologists. Here are the details:

Medical History and Physical Examination:

• A doctor reviews a person's medical history and conducts a physical examination.
• This helps identify any symptoms or risk factors associated with MTC.

Imaging Tests:

• Ultrasound: A form of imaging test that uses sound waves to create pictures of the thyroid and surrounding areas.
• MRI (Magnetic Resonance Imaging): This procedure uses powerful magnets and radio waves to generate detailed images of the body.
• CT scan (Computed Tomography): It produces detailed cross-sectional images of the neck to determine the extent of the cancerous mass.
• PET scan (Positron Emission Tomography): A test that uses a small amount of radioactive material to visualize areas of abnormal cell activity.

Biopsy:

• A biopsy involves removing a small sample of tissue from the thyroid for laboratory analysis.
• This is usually done through a surgical procedure or needle aspiration.
• The sample is then examined by a pathologist to check for signs of cancer.

Blood Tests:

• Calcitonin Blood Test: This measures the levels of calcitonin hormone in the blood, which can indicate MTC.
• Genetic Testing: In some cases, genetic testing may be done on cells obtained from the biopsy to look for specific mutations associated with MTC.

These examinations, tests, and procedures help confirm a diagnosis of MTC by assessing factors such as tumor size, spread to nearby tissues or lymph nodes, and genetic abnormalities.

To determine the type, severity, or stage of MTC, additional examinations and tests may be performed:

• Blood Hormone Studies: This involves checking hormone levels released by organs and tissues in the body. It helps evaluate how well the thyroid is functioning
• Blood Chemistry Studies: These tests measure substances like calcium released into the blood by organs and tissues. Abnormal levels can provide insights into the severity or spread of MTC.

Staging Process:

• Staging helps classify MTC based on its type and age of the patient.
• CT scans are used to create detailed images of various body areas like the chest, abdomen, and brain from different angles.
• The staging process determines if cancer has spread beyond the thyroid and identifies factors indicating its severity or stage.

Remember, it's essential to consult a doctor for a diagnostic evaluation if you experience symptoms associated with thyroid cancer. They will guide you through appropriate examinations and tests tailored to your specific situation.