case_images: PMC7305358_01
case_images: Skin mass in the same area as the CNB scar near the previous operation wound. Surgery involved extensive resection in a spindle-shaped manner.
case_images: gr1.jpg
case_images: PMC7305358_01_gr1.jpg
case_images: fig0005
case_images: There was a palpable skin mass 1 cm in diameter at the CNB scar site near the previous operation wound on the right chest on examination at 1 year after the first operation (Fig. 1).
case_images: Ultrasonography showing a well-defined 8-mm diameter low-echo mass under the skin.
case_images: gr2.jpg
case_images: PMC7305358_01_gr2.jpg
case_images: fig0010
case_images: Ultrasound showed a tumor 8 mm in diameter in the subcutaneous tissue, suggesting skin metastasis (Fig. 2).
case_images: (a) The tumor is seen mainly in the subcutaneous tissue. No invasion into the pectoral muscle was observed. (b) Atypical cells with round, swollen nuclei and eosinophilic cytoplasm forming solid nests with palisade arrangement and gland duct formation.
case_images: gr3.jpg
case_images: PMC7305358_01_gr3.jpg
case_images: fig0015
case_images: Palisade arrangement and gland duct formation were observed but there was no invasion into the pectoral muscles (Fig. 3a-c).