PMC7305358_01
Skin mass in the same area as the CNB scar near the previous operation wound. Surgery involved extensive resection in a spindle-shaped manner.
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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).
Ultrasonography showing a well-defined 8-mm diameter low-echo mass under the skin.
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Ultrasound showed a tumor 8 mm in diameter in the subcutaneous tissue, suggesting skin metastasis (Fig. 2).
(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.
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Palisade arrangement and gland duct formation were observed but there was no invasion into the pectoral muscles (Fig. 3a-c).