PMC9381986_01
Ultrasound of the left axillary area showed a solid mass with two small cystic degenerations, which were highly suspected to be a few liquefied abnormal structures in the lymph nodes.
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Color ultrasound examination indicated that a 4.9 x 3.2 cm solid hypoechoic nodule was seen in the left chest wall adjacent to the axilla, with clear boundaries, uneven internal echogenicity, and multiple echogenicity areas (Figure 1).
A mediastinal window with 16-slice spiral CT showed that the left axilla had a slightly circular and low-density shadow, with a cross-sectional area of approximately 33 mm x 47 mm and a CT value of approximately 33 HU. The mass was closely related to the chest wall, with a slender pedicle faintly visible.
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Chest CT indicated that the left chest wall adjacent axillary had a slightly circular and low-density shadow, with a cross-sectional area of approximately 33 mm x 47 mm and a CT value of approximately 33 HU (Figure 2).
Image of histologic diagnosis from the left axillary mass. (A): HE x 200; (B): S100 x 100; (C): PGP9.5 x 40; and (D): SOX10 x 100.
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It is worth mentioning that this is the rarest of the schwannomas, which are schwannomas with cystic lesions (Figure 3).