Neurological tumor processes when involving urinary bladder organs or innervation, may give rise to urological symptoms. Depending on the organ or nerve tract affected, and whether such involvement leads to disturbances in the storing or emptying capacity of the bladder, the clinical signs manifested may be extremely varied, simulating different pathological entities that may lead to unnecessary treatment. Two such cases are presented. The symptoms produced and the difficulty in pinning down their origin are discussed. The relevance of urodynamic tests and a permanent attitude of suspicion are highlighted as a key approach to correct diagnosis.