Abstract
A 59-year-old man who was diagnosed with small cell lung cancer (SCLC), achieved a complete response to the induction chemoradiotherapy and received prophylactic cranial irradiation (PCI) (25Gy at 250cGy per fraction) in October 2008. Three months later, he complained of anorexia, weight loss, fatigue, and short-term memory loss and developed dementia and systemic muscle weakness. Magnetic resonance imaging in April and July 2009 revealed the progression of the diffuse brain atrophy without evidence of the metastasis of SCLC. Paraneoplastic neurological syndrome was suspected because anti-Hu antibody was detected in his serum and cerebrospinal fluid, but the adverse effects of chemotherapy and/or radiotherapy were also suspected as the cause of his neurological disorder.
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