The following is suggestive of an organic cause of behavioral symptoms:
The presence of prominent visual hallucinations is a strong pointer towards an organic cause (i.e. a disturbance of brain parenchyma such as tumors). Although visual hallucinations can occur in schizophrenia, however, they are not as common as auditory hallucinations. Formal thought disorders are characteristic of schizophrenia. Delusion of guilt can be a feature of schizophrenia or depression with psychotic symptoms.
Formal thought disorder
Auditory hallucinations
Delusion of guilt
Prominent visual hallucinations
Basics of Psychiatry