A 70-year-old man had undergone thoracoscopic esophagectomy following neoadjuvant chemotherapy for thoracic esophageal squamous cell carcinoma 3 years before presentation. He was undergoing whole-brain irradiation following surgery for a solitary brain metastatic tumor. The chief complaint was left leg pain during irradiation. FDG-PET/CT and MRI revealed metastases in bilateral cauda equina S1 nerve roots. Cerebrospinal fluid examination also revealed malignant cells. He received chemotherapy with 2 courses of 5-fluorouracil and cisplatin following 30 Gy of spinal irradiation. To control neurological symptoms, 4 courses of intrathecal chemotherapy with methotrexate, cytarabine, and betamethasone were performed. However, he gradually weakened and died 8 months after brain metastasis and 7 months after leptomeningeal carcinomatosis. The multidisciplinary treatment using irradiation and systemic and intrathecal chemotherapies could improve the survival of patients with leptomeningeal carcinomatosis of esophageal squamous cell carcinoma.
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