Omer Kitis

Ege University · Department of Radiology

INTERNATIONAL CLINICAL PSYCHOPHARMACOLOGY 2023 OUTSTANDING RESEARCH PRESENTATIONS 1st PLACE AWARD

Purpose; The purpose of this study is to classify glial tumors into grade II, III and IV categories noninvasively by application of machine learning to multi-modal MRI features in comparison with volumetric analysis. Methods; We retrospectively studied 57 glioma patients with pre and postcontrast T1 weighted, T2 weighted, FLAIR images, and ADC maps...

Background Dysembryoplastic neuroepithelial tumors (DNETs) are rare, low-grade tumors of the central nervous system (CNS) of childhood. It is an important cause of intractable epilepsy, and it is surgically curable. We aimed to review our institutional experience with DNET in children. Methods Medical records of children aged less than 18 years of...

Background and Purpose MRI features of tumor progression and pseudoprogression may be indistinguishable especially without enhancing portion of the diffuse gliomas. Our aim is to discriminate these two conditions using radiomics and machine learning algorithm and to compare them with human observations. Materials and Methods Three consecutive MRI...

We aimed to investigate cortical and radicular TMS-evoked motor evoked potentials (MEPs) in children with neurological disorders (n = 57, mean age: 5.45 years) and agematched healthy controls (n = 46). Four TMS parameters were analyzed: MEP amplitudes, the latencies of MEP, the latency jump (cortical MEP latency at rest – cortical active-MEP latenc...

Although it is generally accepted that negative symptoms of schizophrenia are associated with larger lateral ventricles, this general assumption could not be validated in patients with primary negative symptoms. To elucidate this issue, we conducted a five-year longitudinal study, including deficit (n=13) and non-deficit (n=26) schizophrenia patien...

Previous structural brain-imaging studies in first-degree relatives of depressed patients showed alterations that are generally accepted as vulnerability markers for depression. However, only half of the relatives had depression at follow-up, while the other half did not. The aim of this study was to identify the brain areas associated with resilie...

Objective Synthetic cannabinoids (SCs) have become increasingly popular in recent years, especially among adolescents. The first aim of the current study was to examine resting‐state functional connectivity (rsFC) in SC users compared to controls. Our second aim was to examine the influence of comorbid attention‐deficit/hyperactivity disorder (ADHD...

Background: This study aimed to investigate the role of computed tomography (CT) in identifying missed unstable blunt cervical injuries. Methods: Patients admitted to the emergency department between June 2014 and June 2018 with a diagnosis of blunt cervical trauma were included in this study. All participants underwent cervical magnetic resonan...

As the primary goal of surgical intervention regarding brain tumors is the simultaneous maximal removal of neoplasms and preservation of brain function, accurate presurgical planning is essential for providing the best possible postoperative quality of life. At the present time, the most commonly used method for preoperative planning is the combina...

Synthetic cannabinoids (SC) have become increasingly popular in the last few years, especially among adolescents. Given ADHD is overrepresented in patients with substance use across adolescents compared to the general population, the current study aims were two-fold: i) examine structural brain network topology in SC users compared to healthy contr...

The aim of this study is to perform transcranial magnetic stimulation (TMS)-based investigation of corticospinal motor pathways in children with cerebral palsy (CP) secondary to hypoxic-ischemic encephalopathy (HIE). TMS parameters including motor evoked potentials (MEPs) and central motor conduction time (CMCT) were recorded in 38 children with CP...

Amaç: Her yıl Dünyada 0-19 yaş arası yaklaşık 300.000 olgu kanser tanısı almaktadır. Gelişmiş ve gelişmekte olan ülkelerde çocukluk çağı kanserlerinin dağılımı ve sağ kalım hızlarında belirgin farklılık bildirilmektedir. Bu çalışmada amacımız merkezimizde kayıtlı olan çocukluk çağı kanser olgularının epidemiyolojik özelliklerini ve sağ kalım hızlar...

Introduction: Synthetic cannabinoids (SCs) have become increasingly popular in the last few years, especially among adolescents. Given Attention deficit/hyperactivity disorder (ADHD) is over represented in patients with substance use across adolescents compared to the general population, the current study aims were two-fold: i) examine cortical th...

Object: Awareness of vascular anomalies in V3 segment of vertebral artery (VA) is crucial to avoid iatrogenic injuries during surgical procedure. This study aimed to analyze the incidence of V3 segment vascular variations and demonstrate the importance of deciding the surgical strategy for C1 screw placement. Methods: Prevalence of vascular vari...

Aim: Brain aneurysm is a balloon shaped dilatation of brain vessels as a result of attenuation of the vessel walls. The aim of this study was to evaluate the relationship between blood flow velocities in the right and left arterial vessels in an unruptured aneurysm and healthy group, and to investigate whether this analysis can help early diagnosis...

Objectives: To evaluate the magnetic resonance imaging (MRI)-derived parameters in differentiation of patients with progressive supranuclear palsy (PSP) from patients with Parkinson’s disease (PD), multiple system atrophy (MSA), and control subjects was aimed. Methods: Thirty-three patients [mean age, 65.21 ± 4.75 years; PSP (n = 9), MSA (n = 8), P...

Purpose: Medulloblastoma (MBL) is the most common pediatric brain malignancy. Postoperative radiotherapy to the entire craniospinal axis is the standard-of-care but has linked to long-term morbidity. In this study, we analyzed the implication of reduced dose craniospinal radiotherapy (RT) for survival and pattern of relapse in MBL patients. Mater...

Choroid plexus papillomas benign (WHO grade 1) neuroepithelial intraventricular tumour which can occur in both the paediatric and adult population. The frequent locations are the lateral ventricle in infants and children and the fourth ventricle in adults. Choroid plexus papillomas are isointense on T1-waighted images and iso-hyperintense on T2-wai...

Aim: To evaluate the role of Fractional anisotropy (FA) values obtained from diffusion tensor magnetic resonance imaging (DTI) in the differentiation and grading of brain tumors.Materials and Methods: This study examined the conventional and diffusion tensor MR imaging findings of twenty-seven patients diagnosed with brain tumors between 2008 and 2...

Amaç: Hemofagositik lenfohistiyositoz (HLH) kontrolsüz immün yanıta yol açan hiperinflamasyonla karakterize klinik bir sendromdur. Etiyolojiye bağlı primer ve sekonder olarak sınıflanmaktadır. Klinik bulguları arasında ateş, splenomegali, hepatit yer almaktadır. Tanı doku örneklenmesi ile konulur. Familyal HLH’li hastaların santral sinir sistemi (S...

Background: Awareness of osseous anomaly of ponticulus posticus (PP) is crucial in avoiding vertebral artery (VA) injuries during the C1 instrumentation. The aim of study is to investigate PP and the relationship between the VA with 3D-CTA. Methods: The relationship between the PP and VA was investigated as intraoperative landmarks. The intersec...

Background: Although reduced hippocampal volume (HCV) is a common finding in depression, it is unclear whether the structural alterations leading to reduction of HCV are pre-existing risk factors before the onset of clinical symptoms or a cumulative process that begins with the onset of clinical symptoms. The aim of the present study was to unders...

Amaç: Wernicke ensefalopatisi (WE) tiamin (vitamin B1) eksikliğine bağlı olarak gelişen nöropsikiyatrik bir hastalıktır. Sıklıkla kronik alkolizme bağlı olarak görülmekle birlikte tiamin alım veya emilim eksikliğine neden olan her türlü durumda ortaya çıkabilir. Bu çalışmanın amacı tedavi edilmediği takdirde ölüme kadar giden ciddi sonuçlar doğurab...

Amaç: Mukopolisakkaridoz (MPS) tip IVa (Morquio Sendromu) otozomal resesif geçişli N-asetilgalaktozamin-6- sulfataz eksikliği sonucu görülen multisistemik tutulum gösteren bir hastalıktır. İskelet sisteminin etkilenmesi temel bulgudur ve odontoid hipoplaziye bağlı servikal miyelopati ve atlantoaksiyal subluksasyona bağlı ağır nörolojik komplikasyon...

Objective: Although emotion dysregulation, one of the core features of depression, has long been thought to be a vulnerability factor for major depressive disorder (MDD), surprisingly few functional magnetic resonance imaging (fMRI) studies have investigated neural correlates of emotion regulation strategies in unaffected high risk individuals. M...

Aim:Hemophagocytic lymphohistiocytosis (HLH) is a clinical syndrome characterized by hyperinflammation causing uncontrolled immune response. It is classified as primary and secondary according to etiology. Fever, splenomegaly, hepatitis are among the clinical findings. The diagnosis is made with tissue sampling. The central nervous system (CNS) upt...

Aim:Mucopolysaccharidosis(MPS)type IVa(Morquio Sydrome)is a disease that makes multisystemic uptake observed as a result of N-acetylgalactosamine6sulfatase deficiency with autosomal recessive transition.The effect on the skeletal system is the main finding and there is a high risk of cervical myelopathy due to odontoid hypoplasia as a result of the...

The majority of the research studying the prefrontal region has focused on gray matter injury. However, recent studies show that damage to white matter also contributes to the development of cognitive impairment after traumatic brain injury (TBI). Through the use of diffusion tensor imaging (DTI), it is now possible to assess the white matter fiber...

Introduction The thought of greater loss of brain tissue in Deficit Syndrome (DS) i.e. subgroup of schizophrenia with enduring primary negative symptoms defined by Carpenter et al.; this has not been verified by recent studies. Objective Accumulated researches suggest that enlargement in Lateral Ventricles (LV) is related with current negative sym...

Objective: To investigate the heritability of personality traits related to brain regions by recruiting a group of healthy mothers with their daughters. Methods: Twenty-two right handed mother-daughter pairs who gave their informed consents were included in this study. All of the participants were screened with non-patient Turkish version of Struct...

Hypoglycemia is the sudden decrease in serum glucose level <50mg/dL. Neurological manifestations complicating profound and prolonged hypoglycemia range from reversible focal deficits and transient encephalopathy to irreversible coma. Here, we report magnetic resonance imaging characteristics of a patient with prolonged hypoglylicemia. A 47-year-old...

Kallmann syndrome is a form of hypogonadotropic hypogonadism accompanied by anosmia or hyposmia. MR images of midline defects in Kallmann syndrome were rarely seen in the literature. We wanted to put emphasis on the midline developmental defects accompanied to Kallmann syndrome shown by MR images of olfactory sulcus hy-poplasia.

A 55-year-old patient was admitted to the hospital with severe acute back pain. Thoracolumbar magnetic resonance (MR) imaging showed hemorrhage in subarachnoidal-subdural space. On cranial MR imaging and MR angiography, an aneurysm was suspected in the V4 segment of the right vertebral artery. Angiography showed a fusiform dissecting aneurysm in th...

West Nile virus (WNV) infection which is asymptomatic or mild in normal population, it may cause serious clinical conditions leading to death in eldery and immunosupressed patients. The virus is mainly transmitted by mosquito bites, however transfusion, transplantation, transplasental and nosocomial ways have also been reported to be responsible fo...

Bipolar I disorder is a highly heritable disorder but not all siblings manifest with the illness, even though they may share similar genetic and environmental risk factors. Thus, sibling studies may help to identify brain structural endophenotypes associated with risk and resistance for the disorder. Structural magnetic resonance imaging (MRI) scan...

Background: The impact of poststroke seizures on the neurological deficits related to ischemic stroke is not well known. It has been reported that following poststroke epilepsy, transient or long-lasting worsening of the poststroke sequelae may develop, but the underlying mechanism of deficit worsening has not been systematically studied by magnet...

Reduced gray matter volume is a frequently reported finding in brain imaging studies performed with schizophrenia patients. Some studies suggest a probable link between the negative symptoms of schizophrenia and gray matter loss; however, some of the negative symptoms observed in schizophrenia patients are not primarily linked to the core of schizo...

Solid organ transplantation is a risk factor for mucormycosis. Mucormycosis is a necrotizing opportunistic fungal infection with high morbidity and mortality. We report a fatal mucormycosis case with rhino-orbital-cerebral involvement in a renal transplant patient, which presented with orbital apex syndrome and hemiplegia.

INTRODUCTION: An evolving literature suggests a volume reduction and a loss of functional integrity of prefrontal cortex in depressed patients. Interhemispheric prefrontal functional integrity is mediated via the anterior portion of the corpus callosum. Until recently interhemispheric fibers connecting prefrontal cortex have not been well defined....

Posterior reversible encephalopathy syndrome (PRES) is a rare but if diagnosed late an irreversible disease. The majority of the patients present with severe hypertension, and effective blood pressure control is the mainstay of therapy. In this case report, we present three cases with PRES, treated successfully with strict volume control policy and...

Schizophrenia is a psychiatric disorder manifesting with heterogeneous symptom clusters and clinical presentations. The deficit syndrome is the condition defined by the existence of primarily negative symptoms, and patients with the deficit syndrome differ from non-deficit patients on measures of brain structure and function. In the current study,...

In this study, we aimed to classify MR images for recognizing Alzheimer Disease (AD) in a group of patients who were recently diagnosed by clinical history and neuropsychiatric exams by using non-biased machine-learning techniques. T1 weighted MRI scans of 31 patients with probable AD and 31 age- and gender-matched cognitively normal elderly were a...

In schizophrenia, the disruption of the communication between two brain hemispheres has not been shown clearly in the anatomical aspect despite other studies with different modalities suggested so. In this study, the structural integrity and the variables affecting the structural integrity of the corpus callosum, which is the main connection betwee...

Val66Met BDNF gene polymorphism is shown to affect the function of mature BDNF and mature BDNF plays an important role in the hippocampal neurogenesis and neuronal survival. A relationship of Val66Met BDNF gene polymorphism and hippocampal volumes in 33 MDD patients and 40 healthy controls is investigated. Region of interest analysis was conducted...

Serotonin is known for its importance in the pathophysiology of major depressive disorder. Although the hippocampus is one of the key regions in which neurogenesis occurs, and serotonin plays an important role in neurogenesis, results of studies that investigate effect of the 5-HTTLPR polymorphism on hippocampal volumes in major depressive disorder...

Brain imaging studies have shown that depressed individuals suffer from inadequate frontal lobe functions vis à vis smaller frontal lobes. The effects of depression's recurrent nature and long-term antidepressant treatment are not definitely known. This study aimed to examine frontal lobe volume at the onset of clinical depression by including firs...

The aim of the study was to investigate the value of diffusion weighted MR imaging in the diagnosis of Modic type 1 change, which may be confused with the acute infectious spondylodiscitis on conventional MR imaging. Twenty-seven patients with erosive intervertebral osteochondrosis, Modic type 1 and 18 patients with spondylodiscitis were included i...

The hippocampus seems to be affected in MDD, and brain-derived neurotrophic factor (BDNF) has positive effects on neurogenesis within the hippocampus. Although there are inconsistencies among study results, a smaller hippocampal volume in depressed patients is thought to be related to the pathophysiology of the disease. We looked at the correlation...

In this retrospective study, we evaluated the contribution and role of diffusion-weighted imaging (DWI) in differentiating acute and chronic forms of brucellar spondylodiscitis. We also describe the characteristics and some indistinguishable features of brucellar spondylodiscitis on magnetic resonance imaging (MRI) to emphasise the importance and l...

Sialic acid storage disorder, known as Salla disease, is a rare autosomal recessive lysosomal disorder produced by a defect of a proton-driven carrier that is responsible for the efflux of sialic acid from the lysosomal compartment. We report two patients with Salla disease: a two-year-old girl, presented with hypotonia, inability to speak and walk...

Maple syrup urine disease (MSUD) is a defect in the catabolism of the branched-chain amino acids; leucine, isoleucine, and valine. Affected patients may also develop hyperammonaemia of unknown etiology. This report describes a four-year-old girl with MSUD, who presented with decompensated hyperleucinaemia with hyperammonaemia. The oral administrati...

Objective: Recent studies neuroimaging showed that continues environmental stimuli can induce structural changes in the brain. Compared to later life, during formal education in school and university; human brain is not only continuously Stimulated with new information but also retrieves the already learned information and extends it with the new o...

We report a rare case of ependymoma with vacuolar features, signet cells, pigmentation and numerous Rosenthal fibers arising in the fourth ventricle of a 35-year-old woman. The tumor was composed of cells with cytoplasmic vacuoles, signet cells and clear cells. The clear cells were compactly arranged resembling oligodendroglioma. Pseudovascular and...

Astroblastoma is an unusual brain tumor in childhood. Tumor usually arises from cerebral hemispheres. This large tumor is well-demarcated, lobulated, solid or cystic, and therefore, may resemble glioblastoma. Histopathologically, there are two types of astroblastoma: well-differentiated (low-grade) or anaplastic (high-grade). In low-grade astroblas...

High-resolution Magnetic resonance imaging (MRI) is helpful in diagnosing diseases such as schizophrenia, alzheimer, dementia etc. Brain segmentation is an important preprocess in medical imaging applications. In this study we compare atlas based segmentation and manual segmentation of hippocampus for volumetric measures. A statistically difference...

The effects of the duration of formal education on adult brain: a voxel-based morphometry - (diffeomorphic anatomical registration using exponentiated lie algebra) DARTEL Study Objective: Recent studies neuroimaging showed that continues environmental stimuli can induce structural changes in the brain. Compared to later life, during formal educatio...

Increased serum cortisol levels and a hyperactive hypothalamo-pituitary-adrenal (HPA) axis have been proposed to play an important role in the pathophysiology of Major Depressive Disorder (MDD). However, there are inconsistent results regarding pituitary gland volume (PGV), which is one of the key elements of the HPA axis evaluated by MRI in depres...

We report a case of a 32-year-old man who presented to the emergency department (ED) with a sudden onset of paraplegia due to spontaneous spinal epidural hematoma. Although the patient had a poor neurological condition on presentation, he was successfully operated and discharged without any neurological sequel. Spontaneous spinal epidural hematoma...

Several magnetic resonance imaging (MRI) and postmortem studies have supported the role of the thalamus in the pathophysiology of schizophrenia. Interestingly, a recent small diffusion weighted imaging (DWI) study showed abnormal thalamic microstructure in patients with schizophrenia. The objective of our study was to use structural MRI and DWI to...

Melanotic progonoma or melanotic neuroectodermal tumor is a rare tumor in infancy. This lesion has to be considered in the differential diagnosis of benign or malignant lesions of calvarium. The authors present a case of a 4-month-old infant with left retroauricular mass. The patient had a subcutaneous mass that is fixed to the underlying skull. CT...

The widespread use of computed tomography (CT) and magnetic resonance (MR) imaging has increased the preoperative diagnosis of dermoid tumors and detection of their complications. In particular, cases of ruptured dermoid tumors, which may manifest as emergent conditions with variable clinical pictures, have typical CT and MR imaging findings. In th...

The aim of this study was to evaluate the role of diffusion-weighted imaging (DWI) in the diagnosis of viral encephalitis and its relationship with the stage of the illness. We performed conventional magnetic resonance imaging (MRI) including T1-W, T2-W and fluid attenuated inversion recovery (FLAIR) sequences and DWI in 18 patients with viral ence...

This case report demonstrates the importance of the CISS sequence, a fast imaging technique in MRI, in case of suspected nerve root avulsion. We present a case of traumatic pseudomeningoceles at T1-T2 root levels with right T2 ventral root avulsion without associated skeletal fracture diagnosed by MRI using the three dimensional CISS technique. A 2...