Breast cancer can metastasize to other organs following initial treatment.Bones, liver, and the lung are the most common sites of breast cancer metastases.The digestive tract, on the other hand, is rarely involved.The incidence of mesorectal metastasis(a special category of rectal metastases) from breast cancer has not been described before.The case reported herein concerns a 68-year-old woman who underwent mastectomy.A pelvic mass with no symptoms was subsequently identified by computed tomography in the patient.We ultimately confirmed that this mass was a metastasis from breast cancer located in the mesorectum using surgical exploration and pathology results. Breast cancer can metastasize to other organs following initial treatment.Bones, liver, and the lung are the most common sites of breast cancer metastases.The digestive tract, on the other hand, is very involved.The incidence of mesorectal metastasis(a special category Of rectal metastases) from breast cancer has not been described before.The case has been described by a 68-year-old woman who underwent mastectomy.A pelvic mass with no middles was wasmiss identified by computed tomography in the patient. Mass was a metastasis from breast cancer located in the mesorectum using surgical exploration and pathology results.