PMC6256313_01
Ultrasound evaluation revealed that the patient had a 24-mm x 18-mm,
well-circumscribed nodule in the right thyroid lobe.
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Ultrasound evaluation revealed that the patient had a 24 mm x 18 mm low echo-level nodule in the right thyroid lobe (Figure 1).
The tumor nodule consisted of an apparently encapsulated mass measuring
2.4 cm x 1.8 cm x 1.5 cm. The cut surface was bulging and showed glistening
gray tissue.
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On section, the cut surface was bulging and showed glistening gray tissue (Figure 2).
(A) Frozen sections showed a well-circumscribed single nodule with an
incomplete fibrous pseudocapsule, (B) suspicious pseudocapsule invasion was
observed in small foci, and (C) some of the tumor cells were visibly
enlarged and deeply stained.
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Suspicious pseudocapsular invasions were observed in small foci, but mitosis and necrosis were absent (Figure 3).
(A and B) Well-circumscribed and encapsulated thyroid leiomyoma in which the
surrounding thyroid tissue showed hyperplastic follicles with sparse foci of
lymphocytic infiltration of the intervening stroma. (C) A uniform tumor
pattern consisting of intersecting fascicles of cells. (D) The tumor cells
were positive for alpha-smooth muscle actin.
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A slightly diffuse lymphocytic infiltration was also observed in many fields of the tumor (Figure 4).