Conclusion:
The case emphasizes the importance of differential diagnosis when patients present with recurrent STEMI-like symptoms despite optimal invasive treatment. The patient was finally diagnosed within three weeks of the first presentation. Cardiac involvement is a late presentation of metastatic lung cancer, so the outcome might not change, but unnecessary invasive studies could have been avoided. Discussing the management of invasive lung carcinoma with cardiac metastasis is beyond the scope of this article.