[Cancer can be a differential diagnosis by psychiatric symptoms].

We present a patient with psychiatric symptoms as the first manifestation from an undetected brain tumor. The patient had symptoms of psychosis and a prior history with depression. A slight alteration in consciousness was found but no neurological deficits. Blood tests showed increased infection counts and particularly increased creatinine kinase. A large frontal glioma cerebri was found on cranial computed tomography and was surgically removed. The symptoms fully resolved afterwards. Psychosis can present with a variety of symptoms but particularly altered consciousness should arouse suspicion of physical origin.