Question
Which of the following parotid gland tumor shows hot spot on Tc99 pertechnetate scan?
| A. |
Adenolymphoma
|
| B. |
Adenoid cystic ca
|
| C. |
Acinic cell carcinoma
|
| D. |
Adenocarcinoma
|
Show Answer
|
Correct Answer » A
Explanation
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|
Warthin tumor (Adenolymphoma) is the second most common benign parotid tumor after pleomorphic adenoma.
A unique feature of Warthin tumor is its ability to concentrate Tc-99m pertechnetate, producing a characteristic:
“Hot spot” on radionuclide salivary gland scan
This finding is highly characteristic and frequently tested in surgical MCQs.
Why Option A is Correct
Warthin Tumor (Adenolymphoma)
Features:
- Benign salivary gland tumor
- Almost exclusively occurs in the parotid gland
- Strong association with smoking
- Often occurs in older males
- May be bilateral or multicentric
Tc-99m Scan:
- Increased uptake
- Appears as a hot nodule (hot spot)
Why Other Options are Incorrect
B. Adenoid Cystic Carcinoma
- Malignant salivary gland tumor
- Characterized by perineural invasion
- Does not show a characteristic hot spot on Tc-99m scan
C. Acinic Cell Carcinoma
- Low-grade malignant tumor of parotid
- Does not concentrate Tc-99m pertechnetate like Warthin tumor
D. Adenocarcinoma
- Malignant epithelial tumor
- No characteristic hot spot appearance
