Metastatic Cavitary Adenocarcinoma of the Lung in a Patient with Recent Aggressive Squamous Cell Carcinoma of the Chest Wall.

The concurrence of two histologically different primary malignancies is rare and diagnostically challenging. Management and monitoring for progression also add to the dilemma as management varies amongst various types of malignancies and radiological imaging cannot differentiate between different primaries. We present a case of 62-year-old male with history of invasive squamous cell carcinoma of chest wall who was found to have cavitary lesions on a chest CT. Initially thought to be metastatic, as squamous cell carcinoma is notorious to case cavitary lesions, on biopsy they turned out be a separate primary malignancy, i.e. adenocarcinoma of the lung. The case highlights, not only such a possibility, but also the need of research to find common chemotherapeutic drugs that can target both pathologies and save patients from side effects of additional anticancer therapies.