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6 Cards in this Set
- Front
- Back
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At what size should you biopsy a thyroid nodule?
Anatomy of thyroid is best seen with what imaging? Isthmus > 1 cm usually means what? |
>1 cm
U/S - transverse/axial Grave's disease |
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diffuse goiter, hyperactive thyroid:
85% of malignant neoplasms are what type? Medullary carcinomas do not respond to what? Which cancers respond to radiation? |
Grave's
papillary carcinomas radiation follicular, papillary |
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Which thyroid carcinoma is fatal?
Characteristics on U/S of benign nodule: |
anaplastic carcinoma
cystic appearance, moving comet-tail artifacts, thin echo free halos, well defined margins, big calcifications, peri-lesional blood flow |
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What do "comet tails" represent on U/S?
Appearance of diffuse toxic goiter (Grave's) on nuc-med scan: Only reason that I-131 is used now? |
dense colloid particles that give off tail artifacts on U/S - sound waves can't penetrate
gland is huge, hot, can't see an isthmus - BILATERAL hyperplasia determine dose of radioactive iodine for therapy |
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Appearance of non-follicular adenoma on U/S:
Appearance of follicular adenoma: Hot nodule that shuts down the rest of the thyroid: Appearance of malignant nodules on U/S: |
hypoechoic (dark) with more cellular component
hyperechoic + colloid spaces autonomous nodule low reflectivity/hypoechoic, irregular margins, thick, irregular halo, intranodular blood flow, hypervascular |
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Difference in appearance between medullary carcinoma/benign nodular hyperplasia on echo:
Difference in blood flow between chronic thyroiditis and Grave's: Difference between thyroid and parathyroid adenoma on sestamibi T-99 washout: |
blood flow around benign nodule, throughout medullary carcinoma
chronic - <40-50 cm/s Grave's - usually 50-150 cm/s thyroid - washes out after 3 h. parathyroid - does not washout after 3 h. |
