CEACAM5 and non-small cell lung carcinoma: Here, we describe a case of NSCLC with adrenal metastasis, in which the primary tumor exhibited spontaneous regression and was pathologically absent following surgical treatment of the metastatic lesion.<h4>Case presentation</h4>A 59-year-old male patient was referred to our department with elevated carcinoembryonic antigen levels and an abnormal opacity on chest CT.