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Search for the word below: diffusion tensor
Number of hits: 23
NOVEMBER 20, 2015
[Posterior reversible encephalopathy syndrome (PRES) is a clinicoradiological entity characterized by epileptic seizures, headaches, altered mental status and focal neurological signs. Hypertension is the second most common condition associated with PRES. The 50-year-old-male patient with right-sided hemiparesis and speech disturbances admitted to our clinic. His blood pressure at the emergency service was 220/140 mmHg. A left putaminal hematoma was seen in his CT and MRI. In his brain MRI, FLAIR and T2 –weighted sequences showed bilateral symmetric diffuse hyperintensities in the brain stem, basal ganglia, and occipital, parietal, frontal, and temporal lobes. After the intense antihypertensive drug treatment, his blood pressure came to normal limits within a week. During his hospitalisation he had a recurrent speech disturbance lasting an hour. His electroencephalography was normal. In his repeated diffusion weighted MRI, an acute lacunary infarct was seen on right centrum semiovale. Two months later, the control MRI showed only the previous lacuner infarcts and the chronic putaminal hematoma. We presented a case developping either a cerebral hemorrhage or a lacunar infarction due to PRES. The main reason of the following complications of the disease was delayed diagnosis. Uncontrolled hypertension was guilted for the events. ]
Lege Artis Medicinae
SEPTEMBER 20, 2018
[Idiopathic pulmonary fibrosis (IPF) is a subgroup of the fibrotising idiopathic interstitial pneumonias occuring primarily in older adults. It is characterised by progressive decline of lung function and is associated with high mortality. IPF is frequently associated with pulmonary hypertension (PH). PH has unfavourable impact on the prognosis of IPF. PH should be suspected in IPF patients presenting with dyspnoe, desaturation on exertion and disproportionately low diffusion capacity. Transthoracic echocardiography is used to screen for PH in IPF patients. Although right heart catheterization is the gold standard procedure for the diagnosis of PH, this is not regularly performed on IPF patients. Chest high resolution computer tomography (HRCT) is essential for the diagnosis of IPF. IPF is typically characterised by the presence of usual interstitial pneumonia (UIP) pattern on HRCT. Multidisciplinary discussion between experienced pulmonologists, radiologists, and pathologists is key in the early and accurate diagnosis of IPF. An important role of the interstitial lung disease-multidisciplinary team (ILD-MDT) is to determine whether other diagnostic examinations and surgical lung biopsy is needed, in an attempt to reduce unnecessary risk. ILD-MDT should propose the initiation of antifibrotic therapies that have the potential to reduce disease progression. All patients diagnosed with IPF, with no contraindications for lung transplantation, should be referred early to a transplant committee.]
Lege Artis Medicinae
AUGUST 30, 2018
[Idiopathic pulmonary fibrosis is a severe irreversible lung disease with a progressive course. The disease onset is hard to discover due to the unspecific signs and symptoms. It occurs mainly in elderly people. In the past decades its prevalence has increased continuously. Physical examination, restrictive pattern on lung function test with decreased diffusion capacity are characteristic features of the disease. Chest X-ray showing fibrotic pattern also points toward the diagnosis of idiopathic pulmonary fibrosis. Differential diagnosis is based on high resolution komputertomográfy. Diagnosis of IPF is based on the appearance of usual interstitial pneumonia pattern together with the lack of external risk factors and autoimmune or other diseases also known to cause this pattern seen on chest imaging. If no firm diagnosis can be built lung biopsy is required. Multidisciplinary teams from clinician, radiologist and pathologist are set in predefined centres that could provide care with novel antifibrotic drugs. These can slow disease progression and are in the frontline in the treatment of the disease. Further research is required to understand the pathomechanism and foster the discovery of further treatment options. ]
JULY 30, 2018
Purpose - To develop an evidence-based, standardized structured reporting (SR) method for brain MRI examinations in neonatal hypoxic-ischemic encephalopathy (HIE) suitable both for clinical and research use. Materials and methods - SR template development was based on comprehensive review of the pertinent literature with the basic sections and subdivisions of the template defined according to MRI sequences (both conventional and diffusion-weighted, MR-spectroscopy (MRS), and T2*-weighted imaging), and the items targeted on age-related imaging patterns of HIE. In order to evaluate the usability of the proposed SR template we compared data obtained from the brain MR image analysis of 87 term and 19 preterm neonates with the literature. The enrolled 106 infants were born between 2013 and 2015, went through therapeutic hypothermia according to the TOBY criteria due to moderate to severe asphyxia and had at least one brain MRI examination within the first two weeks of life. Ethical approval was obtained for this retrospective study. Descriptive statistical analysis was also performed on data exported from the structured reporting system as feasibility test. Results - The mean gestational age of the study population was 38.3±2.2 weeks; brain MRI was performed on 5.8±2.9 day of life, hence in 78% of our patients after the conclusion of therapeutic hypothermia. Our main imaging findings were concordant to the pertinent literature. Moreover, we identified a characteristic temporal evolution of diffusion changes. Interestingly 18% (n=19/106) of the clinically asphyxiated infants had isolated axial-extraaxial haemorrhage without any imaging sign of HIE. Conclusion - In this article our approach of reporting HIE cases with our novel SR template is described. The SR template was found suitable for reporting HIE cases, moreover it uncovered time and location dependent evolution of diffusion abnormalities (and pseudonormalization, as well), suggesting its usefulness in clinical research applications. The high number of isolated intracranial haemorrhages, and the changing diffusion pattern emphasizes the importance of early imaging in HIE.
MARCH 30, 2018
Anterior spinal artery syndrome (ASAS) is a rare syndrome which occurs due to thrombosis of anterior spinal artery (ASA) which supplies anterior two thirds of the spinal cord. A 27-year-old female patient was admitted to emergency clinic with sudden onset neck pain, sensory loss and weakness in proximal upper extremities which occurred at rest. Thrombophilia assessment tests were negative. Echocardiography was normal. Serum viral markers were negative. In cerebrospinal fluid (CSF) examination, cell count and biochemistry was normal, oligoclonal band was negative, viral markers for herpes simplex virus (HSV) type-1 and type-2, Brucella, Borrellia, Treponema pallidum, Tuberculosis were negative. Diffusion restriction which reveals acute ischemia was detected in Diffusion weighted MRI. Digital subtraction angiography (DSA) was performed. Medical treatment was 300mg/day acetilsalycilic acid. Patient was discharged from neurology clinics to receive rehabilitation against spasticity.
MARCH 30, 2018
Atrial myxoma is a rare cause of stroke. In this report we present the case of a 52-year-old female patient who went to hospital suffering from a headache. Her neurological examination was normal except for a positive Babinski sign on the left. In the superolateral of the right, a Sylvian fissure consistent with a thrombosed aneurysm was detected using computerised tomography (CT). Diffusion MRI showed an acute infarction on the right MCA area. Transthorasic Echocardiography and ECG were normal. A -16×4 mm-sized fusiform perpendicular aneurysm on the M2 segment Sylvian curve of right MCA and a -6×4 mm-sized dissecting aneurysm on P3 segment of the left posterior cerebral artery (PCA) were observed in cerebral angiography. Transesophageal echocardiography (TEE) demonsrated a large mass with a suspected size of 2×2×1.5 cm on the left atrium. The mass was resected and on the eighth day after the operation, she had a temporary vision loss and hyperintensity on the T1 sequence was interpreted as laminary necrosis suspected on Cranial MRI. In follow up, she was stable with 300mg acetylsalicylic acid treatment. The main treatment is surgical resection in stroke caused by atrial myxoma.
NOVEMBER 30, 2016
Background - Idiopathic intracranial hypertension is a disease with uncertain etiology. It is not caused by an intracranial mass lesion or hydrocephalus and is characterized by abnormal elevation of intracranial pressure and normal composition of the cerebrospinal fluid. The orbita and intracranial area are closely related anatomically. Elevated intracranial pressure can be transmitted to the orbita through the cerebrospinal fluid around the optic nerve sheath changes at the vitreous humor on diffusion-weighted imaging have not been systemically studied in idiopathic intracranial hypertension. Purpose - The purpose of this study was to investigate diffusion changes in the vitreous humor in patients with intracranial hypertension. Methods - In this retrospective study, 25 patients with papilledema and who had been definitively diagnosed with idiopathic intracranial hypertension and 20 control participants were evaluated. Control subjects and patients were scanned with a 1.5 Tesla magnetic resonance imaging. Apparent diffusion coefficient maps were obtained from diffusion-weighted imaging with a b value of 1000 s/mm2 and apparent diffusion coefficient values were automatically calculated. These images were obtained by a radiologist who was blinded to the details of the study for center of each vitreous humor and the body of lateral ventricle. The mean apparent diffusion coefficient values of each vitreous humor and the body of the lateral ventricle were calculated for each group (control group and patients) and quantitative comparisons were performed. Results - There were no statistically significant differences in mean apparent diffusion coefficient values of the right vitreous humor, left vitreous humor and the body of the lateral ventricle between the patients with idiopathic intracranial hypertension and the control group (p=0.766, p=0.864, p=0.576, respectively). Discussion - Vitreous humor is a closed system and has no direct relationship with the cerebrospinal fluid or cerebral tissue and although morphological changes occur in the orbital structures, including the optic disk and optic nerve in idiopathic intracranial hypertension, the indirect effects of these changes on the vitreous humor may be too subtle to measure. Conclusion - We did not find a significant difference in the mean apparent diffusion coefficient value of the vitreous humor between the patients with idiopathic intracranial hypertension and the control group. However, future studies will be necessary to determine if changes in the vitreous humor can be used to diagnose intracranial hypertension.
SEPTEMBER 30, 2015
Background and purpose - The differentiation of epidermoid cysts from other intracranial lesions with CT and conventional MR imaging is challenging. The risk of residual and recurrent disease is high and multimodal imaging should therefore promote a precise differential diagnosis. Since epidermoid cysts are histologically identical to middle ear cholesteatomas, MRI methods that are useful in the diagnosis of cholesteatoma; specifically EPI DWI and a non- EPI diffusion subtype (HASTE DWI) may possibly be applicable to epidermoid cysts. Besides testing the diagnostic utility of these methods on epidermoid cysts, our goal was to quantify the T1 and T2 relaxation times, the ADC values and the magnetization transfer ratios in order to acquire objective, characteristic information about their structure and contents. Finally, our goal was to provide the physician with a reliable, multimodal diagnostic tool that supports accurate surgical planning. Methods - Two patients with epidermoid cysts were examined. Besides the conventional MR scans EPI DWI, HASTE DWI, quantitative T1, T2 and magnetization transfer measurements were performed mappingwith a 3T MR scanner. After image registration, T1, T2 relaxation times and the magnetization transfer ratio inside a ROI were determined according to the lesion location on HASTE DWI. Mean ADC values inside the epidermoid cysts were also calculated by both mono-exponential and bi-exponential diffusion models. Results - Our results revealed relatively high T1 and T2 relaxation times and ADC values, and low magnetization transfer ratios in both subjects. Conclusion - HASTE-DW MRI provides accurate morphologic information on epidermoid cysts, while T1, T2, ADC and magnetization transfer ratio maps are quantitative techniques. Thus the combination of these methods results in a confident preoperative diagnosis and aids to determine the indication of retreatment in the event of recurrence.
NOVEMBER 30, 2013
[Background - Huntington’s disease is a progressive neurodegenerative disease, genetically determined by CAG trinucleotide expansions in the IT15 gene. The onset of the symptoms is related to the number of CAG triplets. Because the patients are asymptomatic in the early phase of the disease, in vivo biomarkers are needed to follow up the neurodegeneration and to test putative neuroprotective approaches. One such promising biomarker is the diffusion MRI measured microstructural alteration of the white matter. Methods - Seven presymtomatic, mutation carriers and ten age-matched healthy controls were included in the study. Diffusion parameters were compared between groups and correlated with measures describing neurodegeneration. In order to reduce the possible misregistration bias due to atrophy the analysis was restricted to the core of each fibre bundles as defined by maximal fractional anisotropy (Tract- Based Spatial Statistics). Results - Decreased fractional anisotropy, along with increased mean, parallel and perpendicular diffusivity was found in white matter tracts, mainly in the corpus callosum. An inverse correlation was detected between the fractional anisotropy and neurodegeneration score (derived from the number of CAG triplets and the patient age) from the areas of the left precentral gyrus, frontal lobe, corpus callosum and the capsula extrema. Altered diffusion parameters are promising biomarkers of the neurodegeneration in Huntington’s disease.]
JANUARY 25, 2013
[Up to date the presentation of transient splenial lesions in corpus callosum were reported in diffusion weighted magnetic resonance imaging (MRI) only in epileptic patients and patients under antiepileptic therapy. A 41 year old male with no previous medical history was admitted to our clinic with symptoms of pneumonia. The neurological exam revealed stupor, but when awake his speech and orientation were normal. There were no meningeal irritation signs, cranial nerves, piramidal and cerebellar functions were normal. He had moderate respiratory distress and had bilateral rales in lower lobes while oscultating. Laboratory tests revealed high liver function levels and high acute phase reactants. Arterial blood levels showed hypoxemia. A brain MRI showed a hypointensity in the splenium of corpus callosum on T1 weighted images. There was markedly increased signal in this region on diffusion weighted imaging and hypointense on ADC. The lesion was slightly hyperintense on T2 and FLAIR weighted images. A repeat brain MRI was done 30 days after the initial study and showed a complete resolution of the splenial lesion. Transient splenial lesions can be seen due to different mechanisms in different clinical settings. It should be noted that these lesions are mostly reversible. Unnecessary therapies and procedures should be avoided in these lesions.]
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Lege Artis Medicinae[COVID-19-cardiology at spring, 2020]
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