You will be presented with the full text of a biomedical research paper. Please write an abstract for this paper. Your response should include the abstract and no additional text.

Paper text:
written informed consent was obtained from the patient for publication of this case report and accompanying images .
a copy of the written consent is available for review by the editor - in - chief of this journal on request .
spencer r. anderson : responsible for research , organization , and composition of this case report .
charles s. scarborough , md : responsible for the interview , exam , and management of the patient .
highlightsmetastatic carcinoma is identified in an axillary node , without a breast lesion identified on mammogram.mri nor pet identified a cancer primary in the breast , or elsewhere in the body , rendering this as carcinoma of unknown primary ( cup).histochemical staining identified the nodal metastasis consistent with breast origin.recommended treatment for isolated axillary cup is mastectomy alone , or combination radiation plus chemotherapy .