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24 September 2020 : Case report  Japan

Mediastinal Metastasis of Breast Cancer Mimicking a Primary Mediastinal Tumor

Challenging differential diagnosis

Takashi Yamashita1ABCDEF*, Mana Watahiki2BCDEF, Katsuyuki Asai1DE

DOI: 10.12659/AJCR.925275

Am J Case Rep 2020; 21:e925275

Abstract

BACKGROUND: Breast cancer is becoming a common disease in women. It progresses slowly and may recur after a long time. Therefore, when a tumor is found in the chest of a patient with a history of breast cancer, an immediate concern is whether it is a primary tumor or a metastatic tumor. However, mediastinal metastasis is extremely unlikely to occur before lung metastasis, and breast cancer is not likely to have a solitary mediastinal metastasis. Additionally, patients should not undergo invasive procedures unnecessarily, so careful consideration is required.

CASE REPORT: We present 2 cases. In case 1, a 48-year-old woman with a history of breast cancer had a mediastinal tumor. Based on imaging findings, cystic thymoma was suspected. Thoracoscopic intraoperative rapid biopsy showed a lymphocyte-predominant tumor tissue; therefore, the tumor was resected via a median sternotomy. The final pathological diagnosis was breast cancer metastasis. In case 2, a 47-year-old woman who underwent breast cancer resection 15 years earlier was referred for upper limb edema. Based on imaging findings, a left medial vein occlusion due to mediastinal tumor was diagnosed. Our experience in case 1 suggested that a biopsy alone should be performed first. A tumor biopsy was performed through a small transverse neck incision in case 2, and the final diagnosis was metastatic breast cancer of the mediastinum.

CONCLUSIONS: In patients with a suspected primary mediastinal tumor on imaging, the possibility of a metastatic tumor should be considered if they have a history of breast cancer, regardless of how long in the past it was.

Keywords: Mediastinal Neoplasms, Thymoma, Thymus Neoplasms

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923