Guillain-Barré Syndrome as a paraneoplastic neurological disease of pulmonary adenocarcinoma and squamous cell carcinoma: A case report.

We present the case of a 69-year-old male who presented with profound weakness in the extremities. Remarkably, he lacked any identifiable precipitating factors preceding the onset of his illness. However, a diagnosis of Guillain-Barré syndrome (GBS) was established based on typical clinical symptoms, cerebrospinal fluid analysis, and neurological examination. During his hospitalization, an incidental discovery of lung cancer was made. Subsequent pathology confirmed adenocarcinoma and squamous cell carcinoma in the lungs. This case report serves to underscore the exceptional rarity of the simultaneous occurrence of lung cancer and GBS, renewing interest in investigating GBS as a potential paraneoplastic neurological syndrome. Keywords: Guillain-Barré syndrome, paraneoplastic neurological disease, pulmonary adenocarcinoma, squamous cell carcinoma.