Non-diagnostic (IMAGE) Xia & He Publishing Inc. Caption (a) The smear is composed of blood only (smear, Diff-Quik stain). (b) The smear shows foamy macrophages and degenerated cyst fluid, with no follicular cells (smear, Diff-Quik stain). (c) Scant follicular groups are trapped in blood clots, which are insufficient for evaluation (smear, Pap stain). Credit Fang Fan, Min Han Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.