| Summary: | Granular cell tumors (GCTs) are rare benign soft tissue tumors that can occur throughout the body,
particularly the head and neck; only 5%–8% of GCTs occur in the breast. We report a case of a GCT of
the axillary accessory breast, which is a rare location of this tumor. A 50-year-old woman had a 2-month
history of a palpable mass in the left axilla. Physical examination, as well as mammographic and ultrasonographic
findings suggested a breast malignancy. Histopathological examination showed a benign
GCT, and wide local excision was performed. The patient has remained disease-free over 2 years postoperatively.
Although most GCTs are benign, wide complete resection of the tumor and follow-up are
required considering the possibility of recurrence. The radiologist should know the characteristics of
GCTs as a differential diagnosis of breast and axillary lesions to prevent unnecessary treatment.
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