Rectal cancer with solitary hepatic metastasis and Lambert-Eaton myasthenic syndrome.

Lambert-Eaton myasthenic syndrome (LEMS) is a rare autoimmune neuromuscular disease mediated by antibodies to voltage-gated calcium channels (VGCCs) at the neuromuscular junction. LEMS often presents as a paraneoplastic disease. Between 40% to 62% of patients diagnosed with LEMS are confirmed to have small cell lung cancer (SCLC). There are few concerned reports on Gastrointestinal carcinomas. This article reports the treatment process of a young woman with rectal cancer and liver metastasis who associated with LEMS to summarize relevant clinical experience and reduce the rate of clinical misdiagnosis.