[A case of Lambert-Eaton myasthnic syndrome associated with small cell lung carcinoma representing as urinary retention].

A 65-year-old male was admitted with the chief complaint of voiding difficulty on 28 October, 2001. He was in the state of urinary retention. Urological investigation including cystosocopy, urethrocystography, and urodynamic study revealed an areflex-type bladder, according to the new International Continence Society (ICS) classification with no prostatic urethral obstruction. He was diagnosed with neurogenic bladder although the cause of detrusor areflex was unknown. Because all medication was ineffective, transurethral resection of prostate was performed on 11 January, 2002, but urinary retention could not be relieved. After operation, he complained of muscle weakness of upper extremities and poor control of bowels. He was diagnosed with Lambert-Eaton myasthenic syndrome associated with small cell lung carcinoma. His myasthenic symptoms, including autonomic symptoms were relieved after chemotherapy and radiation for small cell lung carcinoma.