A Rare Case: Isolated Metastasis of Laryngeal Cancer to the Breast in a Male Patient.

Laryngeal cancer is one of the common cancer types, and distant organ metastasis is extremely rare. We present a 65-year-old male patient who received five cycles of cisplatin and radiotherapy after surgery for laryngeal cancer. In the positron emission tomography-computed tomography examination performed during the follow-up, we observed a newly developed mass with increased fluoro-D-glucose uptake in the right breast. A hypoechoic lesion with irregular borders of approximately 17 mm × 11 mm × 17 mm was observed in the retroareolar region of the right breast in ultrasound. Calcification was not observed in mammography. In the pathological evaluation after biopsy, it was seen that the neuroendocrine type of laryngeal cancer was compatible with breast metastasis. Although rare, metastases to the breast should be kept in mind in cases with a primary tumor.