Binocular Diplopia: An Unusual Presentation of Squamous Cell Carcinoma of the Lung.

Here, we discuss the case of a 72-year-old male with a known history of COPD who presented with one month of binocular diplopia and headache. The initial clinical investigation discovered destructive intraosseous lesions within the sellar and para-sellar (SPS) regions, suggesting primary versus metastatic intracranial lesions. Further examination revealed a mass in the right lung, with subsequent biopsy confirming squamous cell carcinoma (SCC) of the lung as the primary site of malignancy. The SPS regions of the basicranium, while well-documented to be associated with various primary neoplasms, rarely serve as sites of metastasis. Throughout this article, we will review the pathophysiology of squamous cell lung cancer, current understandings of SPS metastasis, and considerations of metastatic lung SCC management.