Abstract
A 51-year-old man had an 8×9 cm tumor on the left side of his neck. A chest X-ray showed a shadow of a mass in the hilus of the left upper lung. The tumor started to regress the day after the first chest X-ray examination and it decreased in size to approximately 1 cm after 7 days. Left hilar lung cancer was confirmed by a CT scan. Excisional biopsy of the neck tumor showed lymph node metastasis of adenocarcinoma or squamous cell carcinoma. One week later, these lymph nodes increased in size again. The lymph nodes decreased in size following chemotherapy, but both chemotherapy and radiotherapy were ineffective in eradicating the primary lung cancer. The patient died of cancer 16 months later. One of the causes of the regression of palpable cervical lymph node metastasis of lung cancer was suggested to be the small dose of radiation from the chest X-ray.
