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Introduction: In 2013, the American Psychiatric Association published the DSM-5. In this new version, new diagnoses were proposed including the Hoarding disorder. In the French semeiology, the Diogenes syndrome is described, among other symptoms, by a pathological tendency to accumulate objects called syllogomania which is very close to hoarding. This paper explores the similarities and differences between the two syndromes., Description: The Diogenes syndrome was first described in 1966 but was officially named for the ancient Greek philosopher in 1975 by Clark. Its frequency is around five for 100,000 persons. Many aetiologies have been known to be associated with the Diogenes syndrome: schizophrenia, dementia - especially frontotemporal type, anxiety disorders, mood disorders, and substance abuse - especially alcohol abuse. The diagnostic requires one major criterion, the inability to ask for medical or social help, and one of three minor criteria: a pathological relationship to the body, which leads to somatic illness; a pathological relationship to the society, which leads to a progressive exclusion from it; and finally, a pathological link with objects. This last criterion is very interesting because it is closely related to the Hoarding syndrome: indeed, patients with syllogamania, as also named, have a tendency to hoard every object they find. At the end, their homes are full of useless objects, and some living places can be unusable because they are cluttered and congested. This last point is similar to the definition given in the DSM-5 for the Hoarding disorder which describes a persistent difficulty parting with possessions; distress associated with discarding possessions; and accumulations that congest and clutter active living areas. The Hoarding disorder was first part of the Obsessive and compulsive disorders, but it has progressively appeared that it could be individualized with its own prevalence of 2.3% to 14% lifetime. Genetical studies have shown that at least 50% of patients suffering from excessive hoarding had a relative with a dimension of hoarding. Finally, Mattaix-Cols et al. decided to create a new syndrome in the DSM-5, and the Hoarding disorder was born., Discussion: The discussion begins with relationships between the Hoarding disorder and the Diogenes syndrome. A patient with hoarding, and a poor insight, could be very isolated, and could persist in a lack of calling for help, because of not being aware of his pathology. Thus, it could be diagnosed as a Hoarding syndrome with a poor insight, or as a Diogenes syndrome, with the first major criterion (lack of calling for help) and one of the three minor criteria, the syllogomania, or hoarding. Moreover, some authors have described old people living for many years with a tendency to hoard. Progressively, some of them had a congested and cluttered home, and a few were living in squalor, a description very close to the Diogenes syndrome. Finally, we discuss the comorbidity of Hoarding disorder and Diogenes syndrome. In particular, the first one is associated with Attention deficit and hyperactivity disorders; and some authors also described the links between ADHD, bipolar disorder and frontotemporal dementia which is one of the aetiologies of the Diogenes syndrome. A psychodynamic model in which ADHD, Hoarding disorder and Diogenes syndrome are linked can be imagined, and the last one could be an overlooked evolution of the two first syndromes., Conclusion: In conclusion, we can imagine a dimensional model, based on two dimensions: hoarding and squalor. Hoarding disorder is the major expression of the first dimension, and Diogenes syndrome the major expression of the second. Both of them could be a different expression of one central aetiology. More studies are needed to complete this vision., (Copyright © 2016 L'Encéphale, Paris. Published by Elsevier Masson SAS. All rights reserved.)

Background: Negative hallucinations are characterized by a defect in perception of an object or a person, or a denial of the existence of their perception. Negative hallucinations create blank spaces, due to both an impossible representation and an incapability of investment in reality. They have a close relationship with Cotard's syndrome, delusional theme of organ denial observed in melancholic syndromes in the elderly., Methods: Phenomenological approach. The phenomenology of negative hallucinations provides quite an amount of information on the origin of the psychotic symptoms when one is rather old., Results: The connections between hallucinations, mood disorders and negative symptoms are often difficult to live with for the nearest and dearest. Negative hallucinations require a strict approach to identify their expression that is crucial because a wide heterogeneity exists within the pathological pictures, as in Cotard's syndrome. Although the negative hallucination has an anti traumatic function in elderly people fighting against mental pain, it still represents a deficiency in symbolization. The prevalence of this symptom is without doubt underestimated, although its presence often underlines thymic suffering that is more striking. These hallucinatory symptoms have an important impact on the patients' daily life, and they appear to be prisoners of a suffering, which cannot be revealed., Conclusions: We propose in this article to review the clinical symptoms of negative hallucinations in the elderly and the way to manage them. The medicinal approaches are not always effective. A greater place must be given to what is in connection with the body, aiming at a strong impact and thus to offer non-pharmacological approaches, such as somatic ones, which can be either invasive (electroconvulsive therapy) or not (transcranial magnetic stimulation)., (Copyright © 2014. Published by Elsevier Masson SAS.)

Psychogeriatrics is a rapidly growing field. In France, the focus is currently on targeted education and specific management. Psychiatric disorders may be atypical in the elderly, and may also be difficult to distinguish from the effects of aging or somatic disorders. The principal disorders observed in old age are depression, late delusion, anxiety disorder, hysteria, delirium and mania. Depression has specific features, depressive equivalents, particular risk factors, and a categorical and dimensional therapeutic approach. Diagnosis and screening must be improved Late delusion is organized around a notion of injury, and is an active attempt to deal with isolation, depression and anxiety. The term "very late-onset schizophrenia-like psychosis" has been proposed. Anxiety also has specific features in the elderly and is intimately related to depression. If left untreated, the consequences can be severe. Hysteria is pathoplastic with time, age and educational status. Pseudocognitive conversions are starting to be seen in old age. Delirium is very frequent in the elderly; it is often multifactorial, but psychosocial factors must not be underestimated. Mania can also be provoked by somatic disease, and mixed syndromes are far from rare. Dementia can be approached from its psychopathological dimension, particularly in terms of psychosocial risk factors and protective factors relating to the individual's biography and personality. Thus, psychogeriatrics is an integrated medical discipline in which psychiatric disorders are approached through specific clinical management, oriented research and structured training.