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Updated: Aug 14, 2026
Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration
Published on: November 10, 2014
Three-dimensional cytomorphology in fine needle aspiration biopsy of subacute thyroiditis
Tien-Chun Chang1, Shu-Mei Lai, Chen-Yuan Wen
1Departments of Internal Medicine and of Anatomy and Cell Biology, College of Medicine, National Taiwan University, National Taiwan University Hospital, Taipei, Taiwan. tcchang@ha.mc.ntu.edu.tw
Objective:
To elucidate 3-dimensional (3-D) cytomorphology in fine needle aspiration biopsy (FNAB) of subacute thyroiditis.
Study Design:
Ultrasound-guided FNAB was performed on the inflamed area of the thyroid from 4 patients with subacute thyroiditis. The aspirates were stained and observed under a light microscope (LM). The aspirates were also fixed, dehydrated, critical point dried, spattered with gold ions and observed with a scanning electron microscope (SEM). For transmission electron microscopy (TEM), the specimen was fixed, dehydrated, embedded in an Epon mixture, cut with an ultramicrotome, mounted on copper grids, electron doubly stained with uranium acetate and lead citrate, and observed with TEM. Findings with SEM were correlated with those with LM and TEM.
Results:
Under SEM, 3-D cytomorphology of subacute thyroiditis displayed loss of a uniform, honeycomb cellular arrangement; variation in size; and decrease or shortening of microvilli in follicular cells, which corresponded to varying degrees of cellular degeneration under TEM. Giant cells that were round or ovoid were also noted with SEM.
Conclusion:
Loss of a uniform, honeycomb cellular arrangement; variation in size and decrease or shortening of microvilli in follicular cells; and appearance of round or ovoid giant cells were characteristic 3-D cytomorphology findings in FNAB of subacute thyroiditis.
