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Primary thyroid lymphoma associated with metastatic thyroid tumor: discrimination with US
A Horii1, S Takashima, J Yoshida
1Department of Otolaryngology, Osaka Teishin Hospital, Osaka 543, Japan.
Summary
Ultrasonography effectively differentiated between colon cancer metastasis and primary thyroid lymphoma. Even small 1 cm thyroid lymphomas presented distinct imaging features compared to metastatic tumors.
Area of Science:
- Oncology
- Radiology
- Pathology
Background:
- Distinguishing metastatic adenocarcinoma from primary thyroid lymphoma can be challenging.
- Accurate diagnosis is crucial for appropriate treatment planning.
Observation:
- A 75-year-old male presented with metastatic colon adenocarcinoma and a primary thyroid lymphoma.
- Radiologic findings from ultrasonography were correlated with histopathology.
Findings:
- Ultrasonography differentiated the two tumors by margin characteristics and echogenicity.
- Metastatic tumors appeared ill-defined and hypo to iso echoic.
- Thyroid lymphoma appeared as a well-defined, markedly hypoechoic mass, even at 1 cm.
Implications:
- Ultrasonography is a valuable tool for differentiating thyroidal masses.
- Early-stage thyroid lymphoma exhibits characteristic imaging findings.
- This distinction aids in surgical and oncological management.