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\"Phantom Limbs and Body Integrity Identity Disorder discusses the conditions of Phantom Limb Syndrome and Body Integrity Identity Disorder together for the first time, exploring examples from literature, film, and psychoanalysis to re-ground theories of the body in material experience\"-- Provided by publisher.

Body integrity identity disorder (BIID) is a rare condition characterised by a discrepancy between specific areas of an individual’s perceived body image and body schema which causes the individual to disassociate those physical areas of their body from their internal representation. There are currently no efficacious, ethically unambiguous means for achieving long-lasting symptom reductions. In the case we present, two patients with BIID underwent an augmented reality (AR)-based simulation that virtually amputated their alienated limbs, allowing them to experience their ideal selves. During the exposure, both patients reported reductions in BIID-related complaints. These preliminary results suggest the existence of a possible therapeutic and diagnostic potential that AR possesses, which warrants further consideration within clinical healthcare settings.

Body Integrity Identity Disorder (BIID) is a non-psychotic condition wherein individuals desire amputation or paralysis of one or more healthy, fully-functioning limbs (predominantly the legs). Individuals with BIID have been suggested to have a mismatch between the perceived mental representation of the body and its actual physical structure, such that their desired identity matches that of a lower-limb amputee. Accordingly, studies have reported an altered central network involving body representation of the legs in BIID, but its relationship to behavior remains unclear. In the present study, we investigated the integrity of body representation in individuals with BIID, acquired lower-limb amputees, and normally-limbed controls using an online mental rotation task. Participants judged the laterality of left and right foot images presented from different views, orientations, and of different types. We expected BIID participants to be slower for mentally rotating images that corresponded to their affected legs than lower-limb amputees and normally-limbed participants. We found that the groups did not significantly differ in their performance. All participants were slower at judging feet presented in awkward postures than natural postures, replicating previous studies and validating our online paradigm. The results are discussed in terms of the robust nature of visual and sensorimotor lower-limb representations, whether related to the self or as prototype, in the context of disturbed lower-limb integrity.

Background: Body integrity dysphoria (BID) is a rare disorder, in which individuals experience a persistent desire to become physically disabled, often through limb amputation. It is now included within the International Classification of Diseases 11th Revision (ICD‐11), and this is one of the first case reports to describe the application of these new diagnostic criteria. This also raises the question of treatment pathways for individuals with the disorder, with recognition bringing legitimacy to patients’ experience, and responsibility to professionals. Case Presentation: We describe the experience of a 50‐year‐old man with a long standing desire for his leg to be amputated. He described frustration with the support available, and shame associated with accessing this. After discussions in an online forum he caused dry ice burns to his leg, which resulted in a below‐knee amputation. The patient was satisfied with this outcome. All the essential features of ICD‐11 diagnostic requirements for BID were met, as well as a number of additional clinical features. Conclusions: New diagnostic criteria appeared both accurate and acceptable to our patient. This formal recognition of the diagnosis presents a new challenge to services about how best to support individuals, and whether there needs to be development of clinical guidance to support clinicians.

Patients suffering from body integrity dysphoria (BID) desire to become disabled, arising from a mismatch between the desired body and the physical body. We focus here on the most common variant, characterized by the desire for amputation of a healthy limb. In most reported cases, amputation of the rejected limb entirely alleviates the distress of the condition and engenders substantial improvement in quality of life. Since BID can lead to life-long suffering, it is essential to identify an effective form of treatment that causes the least amount of alteration to the person’s anatomical structure and functionality. Treatment methods involving medications, psychotherapy, and vestibular stimulation have proven largely ineffective. In this hypothesis article, we briefly discuss the characteristics, etiology, and current treatment options available for BID before highlighting the need for new, theory driven approaches. Drawing on recent findings relating to functional and structural brain correlates of BID, we introduce the idea of brain–computer interface (BCI)/neurofeedback approaches to target altered patterns of brain activity, promote re-ownership of the limb, and/or attenuate stress and negativity associated with the altered body representation.

Some men elect castration voluntarily without any clear medical reason. Here we aim to document their perception of genital ablation and injuries to better understand their motivations for castration. Participants completed an online survey with open-ended questions related to their perspectives on castration, genital ablation, and genital injuries. Thematic analyses were performed on the responses to these questions. Responses were obtained from 208 male castrated individuals (51.9 ± 16.0 years old). Among these, 154 were physically castrated, 36 chemically castrated, and 18 nullified (had testicles and penis removed). The majority learned about castration from media (55.8%) or animal castration (23.4%). The circumstances when they first wanted to be castrated varied greatly. Most (46.3%) wished to achieve an idealized self motivated by gender dysphoria, body integrity dysphoria, or wanting to be conspicuously non-sexual. The top themes we identified related to the respondents’ perceptions of the pros of genital ablation were physical appearance, psychological benefit (i.e., a “eunuch calm”), and being non-sexual. Conversely, themes related to the cons they saw in having no genitals ranged from no disadvantages to loss of sexual/reproductive capability. Some perceived performing genital injury as a step toward ultimate castration or nullification. The respondents similarly varied in whether they saw any loss in having non-functional testicles. Perceptions in this regard appeared to differ depending on whether the respondents were taking supplemental androgens post-castration. Motivations for castration vary greatly between individuals. Clinicians need to understand men’s diverse perceptions on castration in order to provide appropriate care for individuals with strong castration desire.

People who suffer from body integrity dysphoria (BID) feel a strong need to be disabled. The most common desire is for amputation or paralysis. Objectives: This study aims to gather the opinion of experts on which types of disabilities are included in BID, which therapies are useful and whether those affected should be supported in obtaining a disability. Methods: A questionnaire with 62 items and a flow chart were developed and sent to experts who have published work with regard to BID. Participants: 22 experts from 11 countries, mostly with an academic title and with an average age of 48.5 years, responded. Results: As expected, amputations and paralysis were clearly attributed to BID, other disabilities (toothlessness, incontinence, diabetes) received rather uncertain or negative scores. On average, those affected were not classified as mentally or psychiatrically ill. Neurological misconnection was considered the most likely cause. Experts did not think it was helpful to inform the health system or even the police about the desire to be disabled. Almost all experts supported the surgical solution of amputation by doctors. All participants believed that BID patients are aware of the limitations imposed by the desired disability. Finally, a flow chart is presented for diagnosis and therapy. Conclusions: The experts assume that the surgical solution is currently acceptable if it has been proven that the BID-affected person does not suffer from another mental disorder, there is a high level of suffering due to BID, other therapies have not been of any use and it is clear that the quality of life will actually increase as a result of achieving the disability.

Background The amputation of a limb constitutes one of the most severe disruptions of body integrity. Nevertheless, many individuals with limb amputation report a restored sense of integrity when wearing a prosthesis. The rubber limb illusion (RLI) has been proposed as an experimental model to study such experiences. In this paradigm, correlated visuo-tactile stimulation of the residual limb and an artificial limb can induce amputated individuals to experience ownership of the latter one which is then perceived as a counterpart of the missing limb. However, due to methodical limitations in previous setups, the neural processes underlying alterations in the sense of body integrity remain insufficiently understood. Methods In this cross-sectional study, we developed a novel RLI setup to systematically manipulate the sense of body integrity in a sample of N  = 34 individuals with unilateral lower limb amputation. Participants completed six randomized trials across two experiments. In Experiment 1, we varied artificial limb appearance (intact vs. impaired) and visuo-tactile stimulation (synchronous vs. asynchronous) on the residual limb. In Experiment 2, we manipulated artificial limb appearance and induced the RLI on both the residual and the non-amputated limb. Neural activity was assessed using functional magnetic resonance imaging. Results Synchronous visuo-tactile stimulation of the residual limb and an intact artificial counterpart induced artificial limb ownership and was associated with improvements in perceived body integrity. Neuroimaging revealed specific activation in the left superior parietal lobule associated with dynamic changes in the sense of body integrity. Neural activity underlying RLI processing did not significantly differ between the residual limb and the non-amputated limb. Conclusion Appropriate multimodal sensory stimulation can strengthen the sense of body integrity in most individuals with lower limb amputation. This effect appears to be mediated by the brain’s capacity for sensory integration within the body representation network. These insights advance our understanding of prosthesis-related experiences and may inform the development of improved prosthetic devices that employ non-invasive somatosensory feedback, thereby promoting positive rehabilitative outcomes through enhanced prosthesis embodiment.

Background Liver cancer stem cells (LCSCs) contribute to hepatocellular carcinoma (HCC) development, metastasis, and drug resistance. MSI2 and Notch1 signaling are involved in the maintenance of CSCs. However, it is unknown whether MSI2 and Notch1 are involved in the maintenance of CD44v6+ LCSCs. Therefore, we investigated the clinical significance and function of MSI2 and its relationship with Notch1 signaling in the maintenance of stemness properties in CD44v6+ LCSCs. Methods The expression of MSI2 and CD44v6 were detected by fresh specimens and a HCC tissue microarray. The tissue microarray containing 82 HCC samples was used to analyze the correlation between CD44v6 and MSI2. CD44v6+/− cells were isolated using microbeads sorting. We explored the roles of MSI2 and Notch1 signaling in CD44v6+ LCSCs by sphere formation assay, transwell assay, clone formation assay in vitro, and xenograft tumor models in vivo. A Notch RT 2 PCR Array, Co-immunoprecipitation, and RNA-immunoprecipitation were used to further investigate the molecular mechanism of MSI2 in activating Notch1 signaling. Results Here, we found MSI2 expression was positively correlated with high CD44v6 expression in HCC tissues, and further correlated with tumor differentiation. CD44v6+ cells isolated from HCC cell lines exhibited increased self-renewal, proliferation, migration and invasion, resistance to Sorafenib and tumorigenic capacity. Both MSI2 and Notch1 signaling were elevated in sorted CD44v6+ cells than CD44v6- cells and played essential roles in the maintenance of stemness of CD44v6+ LCSCs. Mechanically, MSI2 directly bound to Lunatic fringe (LFNG) mRNA and protein, resulting in Notch1 activation. Conclusions Our results demonstrated that MSI2 maintained the stemness of CD44v6+ LCSCs by activating Notch1 signaling through the interaction with LFNG, which could be a potential molecular target for stem cell-targeted therapy for liver cancer.

BackgroundDamage to the right parietal lobe has long been associated with various disorders of body image. The authors have recently suggested that an unusual behavioural condition in which otherwise rational individuals desire the amputation of a healthy limb might also arise from right parietal dysfunction.MethodsFour subjects who desired the amputation of healthy legs (two right, one left and one, at first, bilateral and then left only) were recruited and underwent magnetoencephalography (MEG) scans during tactile stimulation of sites above and below the desired amputation line. Regions of interest (ROIs) in each hemisphere (superior parietal lobule (SPL), inferior parietal lobule, S1, M1, insula, premotor cortex and precuneus) were defined using FreeSurfer software.ResultsAnalysis of average MEG activity across the 40–140 ms post-stimulation timeframe was carried out using an unpaired t test. This revealed significantly reduced activation only in the right SPL ROI for the subjects' affected legs when compared with both subjects' unaffected legs and that of controls.ConclusionsThe right SPL is a cortical area that appears ideally placed to unify disparate sensory inputs to create a coherent sense of having a body. The authors propose that inadequate activation of the right SPL leads to the unnatural situation in which the sufferers can feel the limb in question being touched without it actually incorporating into their body image, with a resulting desire for amputation. The authors introduce the term ‘xenomelia’ as a more appropriate name than apotemnophilia or body integrity identity disorder, for what appears to be an unrecognised right parietal lobe syndrome.