PMC8488420_01
Well-defined and dome-shaped lesions on the upper back.
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F1
A 75-year-old man visited our department complaining of an elastic hard, well-demarcated, 1.4 x 1.2 cm, dome-shaped nodule on the upper back (Fig. 1).
Sonographic findings of lesions on the upper back.
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F2
Taken together with sonographic findings, the round-to-oval shape, posterior echo enhancement, and lateral shadowing (Fig. 2), the preoperative diagnosis was determined as epidermal cyst, and excision was performed under local anesthesia.
Remaining lesion on the right upper back.
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F3
However, a 5.8 x 4.5 cm subcutaneous tumor remained on the right upper back after the operation (Fig. 3).
Chest CT image before removal of epidermal cyst.
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F4
Reviewing the chest CT screen for signs of COVID-19 revealed a subcutaneous lesion beneath the epidermal cyst with adipose tissue signal (Fig. 4).