PMC8573521_01
Computed tomography scan of the case before treatment (the deposit in the left lobe of the thyroid gland is circumscribed as a pale margin, the purple arrow points at the margin).
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Ultrasonography and cervical CT showed a solid mass sized 13 x 14 x 36 mm in the left thyroid lobe (Figure 1).
Microscopic examination of the lesion (erythrocytes [the yellow arrow], neutrophils [blue arrow] and basophil granules representing small colonies of Actinomyces bacteria [white arrow]).
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Actinomyces species (Figure 2). A sample of the biological material was cultivated on agar for anaerobic bacteria with 7% sheep blood (EnviroLab) at 35 C to 37 C in the anaerobic atmosphere by prolonged cultivation.