Cystic degeneration in a thyroid colloid nodule
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Within the left visceral space and there is a large relatively homogeneous, well-circumscribed lesion. It is of higher density than simple fluid measuring 57 HU. There is a rim of enhancing thyroid tissue in keeping with an intraparenchymal lesion. There is positive mass effect with deviation of the trachea to the right. No airway compression seen.
Conclusion: Large left thyroid lesion likely represents a colloid cyst with resultant mass-effect and tracheal deviation to the right.
The patient went on to have the cyst aspirated.
MACROSCOPIC DESCRIPTION: 15ml clear orange fluid.
MICROSCOPIC DESCRIPTION: The smears contain scattered groups of follicular cells, abundant macrophages, colloid and acellular debris. No malignant features are identified.
FINAL DIAGNOSIS: Cystic degeneration in a colloid nodule (benign).