WOS

Permanent URI for this collectionhttps://hdl.handle.net/11443/932

Browse

Subject: search.filters.subject.magnetic resonance imaging

Search Results

Now showing 1 - 8 of 8
  • No Thumbnail Available
    Item
    Cranial MRI Abnormalities and Long-term Follow-up of the Lesions in 770 Girls With Central Precocious Puberty
    (ENDOCRINE SOC, 2021-01-01) Helvacioglu, Didem; Turan, Serap Demircioglu; Guran, Tulay; Atay, Zeynep; Dagcinar, Adnan; Bezen, Digdem; Ozturan, Esin Karakilic; Darendeliler, Feyza; Yuksel, Aysegul; Dursun, Fatma; Kilinc, Suna; Semiz, Serap; Abali, Saygin; Yildiz, Metin; Onder, Asan; Bereket, Abdullah
    Context: Central precocious puberty (CPP) may arise from central nervous system (CNS) lesions in a few affected girls. Recently, the incidence of girls with CPP has increased mostly in 6-8 year olds, in whom the necessity of magnetic resonance imaging (MRI) is debated. Objective: To investigate the frequency, long-term outcome and potential predictors of CNS lesions in a large cohort of girls with CPP. Methods: A multicenter cohort of 770 Turkish girls with CPP who had systematic cranial MRI between 2005 and 2017. Age at puberty onset was <6 years in 116 and 6-8 years in 654. CNS lesions were followed until final decision(6.2 +/- 3.1 years). Potential predictors of CNS lesions were evaluated by univariate analyses. Results: A total of 104/770 (13.5\%) girls had abnormal brain MRI. Of these, 2.8\% were previously known CNS lesions, 3.8\% had newly detected and causally related CNS lesions, 3.1 \% were possibly, related and 3.8\% were incidental. Only 2 (0.25\%) neoplastic lesions (1 low grade glioma and 1 meningioma) were identified
  • Thumbnail Image
    Item
    Bilateral recurrent external obturator muscle hematoma: An unusual cause of pelvic pain in hemophilia
    (SPANDIDOS PUBL LTD, 2016-01-01) Arpaci, Taner; Sasmaz, Ilgen; Akbas, Tugana; Eken, Alper; Ozgur, Anil; Antmen, Bulent
    Following joint hemorrhages, intramuscular hemorrhages are the second most prevalent bleeding pattern in hemophiliac patients. Hematomas of the iliopsoas muscle are a well-known complication of hemophilia
  • No Thumbnail Available
    Item
    Influence of Infraspinatus and Subscapularis Pathologies on Supraspinatus Muscle Atrophy - A Retrospective Cohort Study
    (MALAYSIAN ORTHOPAEDIC ASSOC, 2020-01-01) Altan, E.; Nayman, A.; Yildirim, A.; Ozbaydar, M. U.; Ciftci, S.; Karahan, M.
    Introduction: Many factors could affect the supraspinatus (SSP) muscle after tendon rupture. We aimed to determine how infraspinatus and subscapularis tendon problems affect supraspinatus muscle atrophy associated with tears, in a retrospective cohort study conducted in a tertiary-level centre. Materials and Methods: Fifty-eight patients with a full-thickness SSP tendon tear who fulfilled the inclusion criteria were enrolled in the study. They were evaluated for tear retraction, fatty degeneration, and other rotator cuff tendon pathologies. Supraspinatus muscle was assessed using the Goutallier classification, and its average area was also measured. Accompanying lesions of the subscapularis and infraspinatus tendons and degree of supraspinatus muscle atrophy were evaluated using magnetic resonance imaging. Results: Our results showed that supraspinatus tendon tears ranged between 3mm and 41mm, and the estimated average cross-sectional area of the SSP muscle was 247.6mm(2). Any degree of infraspinatus tendon pathology, ranging from tendinosis to full-thickness tears, was significantly correlated with the SSP muscle area (P < 0.05). The subscapularis tendon pathologies did not show a similar correlation. The interobserver and intraobserver reliabilities of the measurements were graded as excellent. Conclusion: Impairment of any of the rotator cuff muscles may affect the other muscles inversely. Our study showed that all infraspinatus tendon pathologies and partial subscapularis tears affect and alter the SSP muscle belly. We suggest early intervention for supraspinatus tears to avoid further fatty degeneration, as muscle atrophy and fatty degeneration progress in combination with the accompanying lesions.
  • No Thumbnail Available
    Item
    Diffusion tensor imaging in early amyotrophic lateral sclerosis using 3T magnetic resonance imaging
    (EGE UNIV, 2018-01-01) Sarsilmaz, Aysegul; Firat, Zeynep; Ulug, Aziz M.; Karlikaya, Geysu; Bingol, Canan Aykut; Hamamci, Andac; Kovanlikaya, Ilhami
    Objective: Amyotrophic lateral sclerosis (ALS) is a multisystem condition which impairs white matter, corticospinal tract and frontotemporal functions including cognition and behavior. This study aimed to perform diffusion tensor imaging (DTI) to detect white matter microstructural abnormalities, and also understanding the pathophysiology in ALS using 3T magnetic resonance imaging. Methods: The study examined 12 patients (7 males, 5 females) with sporadic ALS and 10 subjects in the control group (7 males, 3 females) by voxel-based analysis of DTI with 3T MRI. We compared fractional anisotropy (FA) and apparent diffusion coefficient (ADC) parameters in the corticospinal tracts among patients who had ALS and those in the healthy control by DTI region of interest (ROI) and tractography techniques. Results: The FA and ADC measurements of the patient group were respectively 0.638 +/- 0.041 and 0.350 +/- 0.01 (p<0.001). The results of the healthy control group were respectively 0.701 +/- 0.054 and 0.288 +/- 0.027 (p<0.05). DTI showed decreased fractional anisotropy in bilateral corticospinal tracts and internal capsule posterior crus. There was a correlation between the FA reductions in this region and the severity of the disease in the patients with ALS. Conclusion: Consequently, with this longitudinal DTI study, the progress of upper motor fiber degeneration in ALS was demonstrated. It may be useful to utilize DTI to monitor the progress and effectiveness of treatment interventions, as well as understanding the pathophysiology of ALS.
  • Thumbnail Image
    Item
    A rare case of paratesticular leiomyoma in a child
    (AVES, 2019-01-01) Arslan, Aydan; Ulus, Sila; Ince, Umit; Tekant, Gonca; Karaarslan, Ercan
    Leiomyomas are benign, slow-growing, smooth muscle tumors, which can occur at many locations in the body. The male genitourinary tract is seldom affected and scrotal leiomyomas are extremely rare. Most of the scrotal leiomyomas are localized in the testis, epididymis, spermatic cord, subcutaneous tissue, tunica albuginea, and scrotal skin and only a few of them are reported in the origin of isolated tissue without paratesticular structures in the paratesticular region. We are presenting a case of solitary paratesticular leiomyoma in a child, which is very rare in terms of lesion location and patient age, and describing the imaging features of this lesion.
  • No Thumbnail Available
    Item
    A Comparative Study of Multiparametric MRI Sequences in Measuring Prostate Cancer Index Lesion Volume
    (UBIQUITY PRESS LTD, 2022-01-01) Bagcilar, Omer; Alis, Deniz; Seker, Mustafa; Erdemli, Servet; Karaarslan, Umut; Kus, Aylin; Kayhan, Cavit; Saglican, Yesim; Kural, Ali; Karaarslan, Ercan
    Objectives: To compare the effectiveness of individual multiparametric prostate MRI (mpMRI) sequences-T2W, diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC), and dynamic contrast-enhanced (DCE)-in assessing prostate cancer (PCa) index lesion volume using whole-mount pathology as the ground-truth
  • Thumbnail Image
    Item
    Initial Outcomes and Assessment of the Transperineal Multiparametric-Magnetic Resonance Imaging/Ultrasonography Fusion Biopsy Method in Diagnosing Clinically-significant Prostate Cancer
    (GALENOS YAYINCILIK, 2017-01-01) Ozgen, Mahir B.; Ozveren, Bora; Uzel, Sertac; Altug, Ugur; Turkeri, Levent
    Objective: In this study, it was aimed to investigate the success of transperineal multiparametric magnetic resonance imaging (mp-MRI)/transrectal ultrasonography (USG) fusion prostate biopsy method in prostate cancer diagnosis and detection of clinically significant cancer. Materials and Methods: All patients signed written informed consent then patients with an indication for prostate cancer, therefore biopsy was planned for the last year underwent 3 Tesla mp-MRI retrospectively. All the lesions of patients with Prostate Imaging, Reporting and Data System (PIRADS) 3, 4 and 5 lesions were marked using MIM (TM) Symphony software by a single radiologist. All patients underwent transperineal MRI/USG fusion biopsy under general anesthesia. In the prostate MRI evaluation of the targeted lesions with a PIRADS score of 3-4-5 were sampled with 2 to 5 cores followed by random biopsies of both of the prostate lobes. Results: Prostate adenocarcinoma was diagnosed in 20 of 59 patients (33.8\%) having fusion biopsy. No difference was observed in prostate-specific antigen levels of patients whose biopsy results were benign and malignant. In 63\% of patients, only PIRADS 3 lesions were found, whereas PIRADS 4 and/or 5 lesions were reported in 22 (37\%) patients. The fusion biopsy of PIRADS 3 lesions revealed cancer in 7 patients (19\%), of which 6 had clinically-insignificant prostate cancer criteria. Adenocarcinoma was diagnosed in 59\% who had PIRADS 4 and/or 5 lesions. All these tumors had clinically-significant cancer characteristics. Lesion-targeted fusion biopsies missed 1 clinically-insignificant adenocarcinoma (1/7
  • Thumbnail Image
    Item
    The Diagnostic and Prognostic Value of Magnetic Resonance Imaging for Evaluating Atypical Inflammatory Demyelinating Lesions
    (TURKISH NEUROLOGICAL SOC, 2021-01-01) Ozdemir, Zeynep; Acar, Erkan; Soysal, Aysun
    Objective: The diagnosis of patients with atypical demiyelinating lesions has always been challenging, sometimes leading to a biopsy. Recent literature has radiologically classified atypical inflammatory demyelinating lesions as ring-like, Balo-like, infiltrative, megacystic, and unclassified lesions. In this study, we aimed to assess the demographics and clinical and radiologic findings in patients with atypical lesions. Materials and Methods: The records of 320 patients with demyelinating disorders were retrospectively assessed using iMed database. Patients with atypical lesions and whose magnetic resonance imaging evaluations were included. Clinical and radiologic findings were evaluated and lesions were classified according to the recommended criteria. Results: Twenty-seven patients (16 females) were included and the mean age was 34.26 +/- 6.12 (range: 26-49) years. Fourteeen patients had ring-like, three had Balo-like, three had megacystic, five had infiltrative, and two patients had unclassified lesions. Diffusion restriction was observed in contrast-enhancing sites in ring-like lesions, heterogeneously in infiltrative lesions and also peripherally in Balo-like lesions. Two patients with infiltrative lesions had additional lesions on follow-up and had to undergo biopsy. Two patients died despite aggressive treatment. Two patients with Balo-like lesions were evaluated as having acute disseminated encephalomyelitis and did not have further relapses. Seventeen patients from the study group converted to multiple sclerosis (MS) on follow-up. Conclusion: Differential diagnosis of atypical inflammatory demyelinating lesions is not always easy, the prognosis is not different from MS lesions. Mostly, ringlike lesions seem to convert to MS with recurrent relapses