case_images: PMC8488420_01
case_images: Well-defined and dome-shaped lesions on the upper back.
case_images: cde-0013-0171-g01.jpg
case_images: PMC8488420_01_cde-0013-0171-g01.jpg
case_images: F1
case_images: 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).
case_images: Sonographic findings of lesions on the upper back.
case_images: cde-0013-0171-g02.jpg
case_images: PMC8488420_01_cde-0013-0171-g02.jpg
case_images: F2
case_images: 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.
case_images: Remaining lesion on the right upper back.
case_images: cde-0013-0171-g03.jpg
case_images: PMC8488420_01_cde-0013-0171-g03.jpg
case_images: F3
case_images: However, a 5.8 x 4.5 cm subcutaneous tumor remained on the right upper back after the operation (Fig. 3).
case_images: Chest CT image before removal of epidermal cyst.
case_images: cde-0013-0171-g04.jpg
case_images: PMC8488420_01_cde-0013-0171-g04.jpg
case_images: F4
case_images: Reviewing the chest CT screen for signs of COVID-19 revealed a subcutaneous lesion beneath the epidermal cyst with adipose tissue signal (Fig. 4).