This case illustrates the essence of the categorization of a cystic thyroid lesion. This small cyst seemed to a pure cyst. No solid part can be seen before aspiration. The presence of the solid part became evident only after aspirating the cystic fluid. The solid part contained microcalcifications. Although the risk of malignancy is less in the event of a seemingly pure cyst we do not agree with the suggestion not to aspirate such lesions.