The "reverse breast-oesophagus syndrome": metastatic carcinosis of breast in oesophageal cancer.

A "breast-oesophagus syndrome" has been described previously, wherein breast carcinoma metastasizes to the inner layers of the oesophagus. The entity is extremely rare, but rarer still is metastatic breast carcinosis from oesophageal cancer (EC), a clinical event that might be termed as "reverse breast-oesophagus syndrome". Considered as the sixth most lethal malignancy, 50% EC patients present with metastatic disease. However, they rarely ever metastasize to the breast. For that reason, a malignant breast mass, which develops following EC, is often thought of as a second malignancy. We report a 62-year-old female who had EC, who was treated with oesophagectomy 2 years ago, and represented with a painful left breast mass. Radiological evaluation revealed suspicious findings (breast imaging-reporting and data system score of 4C), while cytology demonstrated squamous pearls, consistent with metastatic squamous cell EC, which probably disseminated to the breast at the time of surgery. She was treated with local excision of the breast mass, which is the treatment of choice in isolated metastasis to the breast. Such an unusual presentation reminds us that, in any "radiologically suspicious" breast lesion in patients with a history of carcinoma of the oesophagus, the possibility of breast metastasis must not be negated.