An Online Compendium of News & Clinical Science July 22, 2015

Disorders of Odor Perception offers links to the latest science and news about olfactory dysfunction. It is updated frequently. Newest items are at the top of each column.

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Anosmia & Hyposmia

Study finds recovery of odor perception following traumatic anosmia is improved by treatment with zinc gluconate. Read more.
Unilateral nasal obstruction is associated with significant reduction in size of ipsilateral olfactory bulb. Read more.
Olfactory impairment and cardiac sympathetic denervation are strongly associated in Parkinson's disease. Read more.
Odor identification impairment appears to be common to a variety of frontotemporal lobar degeneration subtypes. Read more.
Analysis of the 2011-2012 NHANES data suggests 10.6% of Americans experienced self-reported smell disturbance in the past year. Read more.
A bioinformatics approach identifies 152 substances with potential olfactory effects. Read more.
Olfactory dysfunction associated with cognitive impairment in eldery patients with type 2 diabetes. Read more.
Some migraineurs experience reduced ability to name odors during an attack. Read more.
Differences in odor memory performance by patients with unipolar major depression and those with Alzheimer's disease. Read more.
Rare case of primary nasal tuberculosis: 46-year-old woman presents with anosmia and nasal obstruction. Read more.
MRI shows gray matter loss in olfactory cortices of patients with idiopathic olfactory loss. Read more.
Olfactory impairment associated with frontal lobe injury in blast-injured combat troops. Read more.
Centripetal endoscopic sinus surgery produces sustained improvements in a series of 114 patients with chronic rhinosinusitis. Read more.
Subjective improvement found in post-viral olfactory loss at long-term follow-up (~33 months). Read more.
Olfactory dysfunction in first-degree relatives of patients with cleft lip and/or palate may be due to smaller upper nasal region. Read more.
Neurodegeneration in Anderson-Fabry disease is not accompanied by hyposmia. Read more.
Taste and smell alterations in lung cancer patients show gender differences and impact appetite and food enjoyment. Read more.
No effects of subthalamic deep brain stimulation on odor identification ability in patients with Parkinson's disease. Read more.
Nasal airflow-inducing manoeuvre in laryngectomy patients improves smell without respect to nasal endoscopy findings. Read more.
Reduced olfactory function associated with brain lesions in patients with multiple sclerosis. Read more.
Pilot study links flu vaccination to lower rate of olfactory dysfunction. Read more.
Smell sensitivity depends on molecular weight of the odor molecule for older but not for younger adults. Read more.
Endoscopic, CT scan, and sensory measures are correlated in pre- and post-surgical chronic rhinosinusitis patients. Read more.
Olfactory training restores smell loss and alters neural connectivity in olfactory-related brain areas. Read more.
Endoscopic sinus surgery and medical treatment produce comparable improvements in olfaction in chronic rhinosinusitus. Read more.
Olfactory dysfunction predicts early transition from idiopatic REM sleep behavior disorder to Lewy body disease. Read more.
Odor identification better than verbal memory performance in predicting cognitive decline in an urban population. Read more.
Mild taste and smell alterations common in patients investigated for lung cancer but at same rate for those with and without disease. Read more.
Perception of suprathreshold odor intensity is reduced in early-stage Parkinson's disease. Read more.
Primary and secondary olfactory cortical atrophy in Parkinson's disease correlates with smell dysfunction. Read more.
Poorer olfactory performance in patients with pemphigus vulgaris correlates with number of lesions. Read more.
Self-reported olfactory impairment is a significant predictor of dementia. Read more.
A history of smoking is associated with better olfaction among Parkinson's disease patients. Read more.
Olfactory ability discriminates Parkinson's disease from other tremor disorders. Read more.
Smell testing may differentiate frontotemporal dementia from major depressive disorder. Read more.
Impaired olfaction is associated with higher risk of delirium following cardic surgery. Read more.
A six-item, five-minute long, n-butanol olfactory threshold test has been developed for use with home-dwelling older adults. Read more.
Smell and taste disturbances linked to brain irradiation treatment for glioma. Read more.
Patients with idiopathic environmental intolerance show no fMRI difference to smell in olfactory brain areas. Read more.
Failure to find a link between smell function and nutritional status in the old and very old. Read more.
Food preference and intake of obese and normal weight women do not differ in response to odors of no-, low-, and high-energy foods. Read more.
Risk of hazardous events increases with degree of olfactory impairment; age, sex and race also significant factors. Read more.
Smell test modification validated for use with children 6 to 17 years of age. Read more.
Only 0.19% of patients with chemosensory dysfunction attribute it to flu vaccination; no association found between sense of smell and lifetime flu vaccinations. Read more.
Economic model suggests that routine brain MRI is not cost-effective in patients with idiopathic olfactory loss. Read more.
Adenotonsillectomy improves ortho- and retronasal olfaction in children with infectious and/or obstructive adenotonsillar disease. Read more.
Crohn's disease may be associated with abnormal odor perception. Read more.
Questionnaire study suggests that Lyme disease is associated with hyperosmia. Read more.

Parosmia, Dysosmia, Cacosmia & Phantosmia

Case study of olfactory hallucinations in a 53-year-old woman with post-traumatic stress disorder. Read more.
Case study finds parosmia in a middle-aged woman associated with vitamin B12 deficiency. Read more.
Self-selected sample of 496 Britains suffering olfactory dysfunction finds parosmia experienced by 19% and phantosmia by 24%. Read more.
Two case studies suggest that olfactory reference syndrome responds to treatment with antipsychotic and SSRI medications. Read more.
Case study of olfactory hallucinations serving as early warning sign in patient with bipolar disorder. Read more.
Report of Charles Bonnet syndrome with olfactory hallucinations. Read more.
Parosmia and phantosmia are enhanced in patients with severe depression. Read more.
Significant prevalence of olfactory hallucinations in Parkinson's disease. Read more.
No long-term benefit to topical cocainization as a treatment for phantosmia. Read more.
Patient complaining of bad body odor suffering from olfactory delusional syndrome rather than phantosmia. Read more.
Odor source localization less accurate in schizophrenic patients with olfactory hallucinations. Read more.
Case study of cacosmia associated with fungal dacryocystitis. Read more.
Halitosis-like phantosmia experienced by two young patients undergoing radiation therapy for brain tumors. Read more.
Case report of unilateral cacosmia associated with maxillary sinus fungal infection. Read more.
Case report of complex olfactory hallucinations during a migraine attack in a 17-year-old patient. Read more.
Despite expense, MRI imaging is cost-effective in the workup of idiopathic dysosmia. Read more.
Schizophrenic patients have altered hedonic responses to the smell of amyl acetate. Read more.
Changes in odor perception during major depressive episode persist after clinical improvement of depression. Read more.
Osmophobia is common in Taiwanese migaineurs and linked to higher anxiety and depression scores. Read more.
Olfactory reference syndrome in a patient with Parkinson's disease. Read more.
A study links olfactory hallucinations in schizophrenia to specific neuropsychological impairments. Read more.
A case report of Olfactory Reference Syndrome discusses proposed changes to the DSM-V classification. Read more.
Olfactory hallucinations may be a significant non-motor symptom in Parkinson's disease. Read more.
Schizophrenic patients with olfactory hallucinations more likely to have olfactory habituation deficits and past episodes of brief unconsciousness. Read more.
Case report of subacute combined degeneration of the spinal cord and a novel dysosmia. Read more.
An unusual case of migraine headache associated with olfactory hallucinations in a patient with post-traumatic anosmia. Read more.
Activation of subdural electrodes implanted near the olfactory bulb in epileptic children produce olfactory hallucinations. Read more.
A case report of long lasting phantosmia that disappeared under anti-depressive treatment with venlafaxine. Read more.
Case report of headaches in a migraine patient induced by a Valsalva manoeuvre she used to relieve persistent cacosmia. Read more.
Large Chinese study characterizes olfactory and trigeminal event-related potentials in hyposmic and anosmic patients. Read more.
Olfactory hallucinations in headache typically last 5 to 60 minutes, occur shortly before or with the onset of head pain, and consist of a highly specific unpleasant odor. Read more.
A review of the current clinical understanding of olfactory distortions and how to evaluate them. Read more.
A case report from Ceylon of a soldier in his early thirties diagnosed with Olfactory Reference Syndrome, on the basis of an imagined smell of urine in the absence of actual urinary incontinence. Read more.
Australian psychologist R.J. Stevenson examines the evidence for olfactory illusions and the reasons they may escape awareness. Read more.
The body locations that most frequently preoccupy patients with Olfactory Reference Syndrome are mouth (75%), armpits (60%) and genitals (35%). Read more.
A review of all 84 case studies of Olfactory Reference Syndrome published since 1891 reveals that a majority of patients are male with an age of onset <20 years. Read more.
Brain areas involved in odor quality discrimination and odor memory are reduced in size in parosmic patients. Read more.

News & Reviews

Case review of 100 consecutive patients finds MRI imaging adds little value to patient history and clinical examination findings. Read more.
Human clinical data and animal models suggest a link between olfactory dysfunction and depression. Read more.
Olfaction is among the sensory modalities that display altered processing in migraine. Read more.
Review of the literature suggests that olfactory dysfunction may be useful in differential diagnosis of two common conditions in the elderly: Alzheimer's disease and depression. Read more.

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A literature review considers how to use olfactory tests that detect incipient Alzheimer's dementia in clinical trials and screening programs. Read more.
A new review highlights the functional significance of social chemosignals in human reproduction and survival. Read more.
Impaired olfaction is a characteristic feature of Parkinson's disease. A new review summarizes this aspect of PD and the use of smell tests for early and differential diagnosis. Read more.
A cross-cultural comparison of Europeans, Cook Islanders and the Tsimane' of Bolivia finds higher olfactory acuity in the second group, a modern society living amid less air pollution. Read more.
Review of legal cases in the Westlaw database suggests that median settlements and awards for olfactory dysfunction resulting from physician negligence are $300,000 and $412,500 respectively. Read more.
A review of olfactory dysfunction in dementia examines current research and compilation of olfactory assessment tools. Read more.
Systematic literature review finds lack of standardization in quantitative assessment of children's sense of smell. Read more.
Differences in cannabinoid receptor expression in olfactory bulb may account for different sensory effects of cannabis in mice and humans. Read more.
Transient receptor potential (TRP) channels could play a important functional roles in mammalian olfaction. Read more.
A review of olfactory bulb involvement in neurodegenerative diseases, with analysis of large autopsy study of olfactory tract and bulb pathology. Read more.
Literature review finds clear and consistent correlation between general olfactory function and olfactory bulb volume. Read more.
Anatomical features of the anthropoid nose are vestiges of previously functional structures; the vomeronasal organ is absent in adult humans but has a role in olfactory neurogenesis. Read more.
Olfactory event-related potentials now have been recorded successfully from infants between 23 and 41 days old. Read more.
The role of anti-inflammatory therapy and controlled odor exposure in the management of gradual onset smell loss. Read more.
Meta-analysis suggests that olfactory deficits are a useful marker for schizophrenia risk status. Read more.
A review of the anatomy and cellular constituents of the human olfactory mucosa. Read more.
The few studies available suggest that anosmia and olfactory dysfunction are dose-response outcomes of pediatric traumatic brain injury. Read more.
A review of the literature considers how smell impairment impacts quality of life. Read more.
A review of hyposmia in Parkinson's disease and its role as a potential biomarker. Read more.
French review of surgical treatment for nasal polyposis finds improvement in olfactory function. Read more.
How variation in olfactory receptor genes contributes to individual differences in odor perception. Read more.
A review of olfactory deficits and other features of different hypogonadotropic hypogonadal syndromes. Read more.
A review of olfactory neuropathology in Alzheimer's disease. Read more.
Interdisciplinary team speculates about olfactory measures to diagnose and treat infant malnutrition. Read more.
A smell and taste clinic reviews findings from 5,183 patients examined over a 40-year span. Read more.
A review of Machado-Joseph disease notes olfactory dysfunction as one of its nonmotor, extracerebellar features. Read more.
A first-person account of congenital anosmia by a philosopher is included in a special smell issue of The Anatomical Record. Read more.
Humans can discriminate as many as one trillion odors, far more than previously thought. Read more.
A comprehensive review suggests links between smell function and autoimmune disease. Read more.
A systematic review of chemosensation in myasthenia gravis recommends olfactory testing in this disorder. Read more.
A literature review places olfactory dysfunction among the non-cognitive symptoms of Alzheimer's disease. Read more.

Disorders of Odor Perception is updated frequently. Items are entered chronologically with newest items at the top of each column.

Disorders of Odor Perception offers links to the latest science and news about olfactory dysfunction. It does not endorse the material on the linked sites, nor does it offer medical advice. For medical advice about disorders of smell, consult your physician.

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