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Focally Increased Iodine Activity in a Small Thymic Cyst.
1Department of Nuclear Medicine, The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, People's Republic of China.
Clinical Nuclear Medicine
|February 22, 2019
Summary
Papillary thyroid cancer patients may show unexpected activity after I-131 radiotherapy. A mediastinal focus, suspected as metastasis, was actually a thymic cyst.
Area of Science:
- Oncology
- Nuclear Medicine
- Pathology
Background:
- Papillary thyroid cancer (PTC) is the most common type of thyroid cancer.
- Radioiodine (I-131) therapy is a standard treatment for differentiated thyroid cancers.
- Post-therapy scans are crucial for assessing treatment response and detecting residual disease.
Observation:
- A 40-year-old male with biopsy-proven papillary thyroid cancer underwent I-131 radiotherapy.
- Post-therapy scans revealed intense activity in the neck and a focal activity in the right upper mediastinum.
- SPECT/CT confirmed the mediastinal focus, initially suspected as lymph node metastasis.
Findings:
- Pathological examination of the resected mediastinal tissue revealed a thymic cyst, not metastatic cancer.
- This finding highlights a potential pitfall in interpreting post-therapy radioiodine scans.
Implications:
- Thymic cysts can mimic metastatic disease on I-131 scans in thyroid cancer patients.
- Careful correlation with imaging and pathology is essential for accurate diagnosis.
- This case underscores the importance of considering benign conditions in the differential diagnosis of suspicious findings.
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