because the ulcer is increasing in size. On further questioning, she says that she has a discharge from her right nipple as well. Her

mother and aunt died of breasts cancer at 60 and 54 years of age, respectively. On examination, the right breast is enlarged and firm,

with thickened skin, diffuse erythema, edema, and an ulcer measuring 3x3 cm. Mammography is ordered that shows a mass with a large area

of calcifications, parenchymal distortion, and extensive soft tissue and trabecular thickening in the affected breast. The patient

subsequently undergoes core needle and full-thickness skin punch biopsies. The pathology report states a clear dermal lymphatic invasion

by tumor cells. Which of the following is the most common site for metastatic disease in this pathology?