scholarly journals Unusual MR Imaging Features in CT Hyperdense Posterior Fossa Dermoids: Report of Two Cases

2020 ◽  
Vol 09 (01) ◽  
pp. 63-66
Author(s):  
Anbazhagan Sathiaprabhu ◽  
Nichanametla Sravani ◽  
Krishnan Nagarajan ◽  
Sekar Sabarish ◽  
Kapil Patil
Keyword(s):  
Magnetic Resonance ◽  
Posterior Fossa ◽  
Magnetization Transfer ◽  
The Body ◽  
Resonance Spectroscopy ◽  
Imaging Features ◽  
Signal Loss ◽  
Mri Features ◽  
Magnetic Resonance Imaging Mri ◽  
T2 Hyperintensity

AbstractDermoids, either intracranial or in the rest of the body, usually have typical imaging findings due to their fat contents as fat density in computed tomography (CT) and T1- and T2-hyperintensity in magnetic resonance imaging (MRI). Variable imaging appearances have been described due to soft tissue contents, hair, calcification, or even tooth. Posterior fossa dermoids have been reported as a specific variant that shows hyperdensity in CT and mixed signal intensity in MRI. We report two cases of posterior fossa CT hyperdense dermoids that showed unusual MRI features in the form of signal loss in magnetization transfer images and lipid peak in magnetic resonance spectroscopy. Both patients underwent surgical resection and histopathological confirmation and the causes of this unusual imaging appearance are discussed.

scholarly journals Extrahepatic Alveolar Echinococcus on Multi-slice Computed Tomography and Magnetic Resonance Imaging

2021 ◽  
Author(s):  
Guo Hui ◽  
Wenya Liu ◽  
Jian Wang ◽  
Yan Xing
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Adrenal Gland ◽  
Kappa Statistics ◽  
Imaging Features ◽  
Resonance Imaging ◽  
Mri Features ◽  
Magnetic Resonance Imaging Mri ◽  
The Brain

Abstract Background. Alveolar echinococcus (AE) is a severe health problem in endemic areas. In recent years, the incidence of this disease in China has been increasing. The study was designed to illustrate the multi-slice computed tomography (MSCT) and magnetic resonance imaging (MRI) features of extrahepatic AE.Methods. A cohort of 33 patients who suffered from extrahepatic AE was enrolled consecutively from January 2012 to December 2017. The MSCT and MRI features of extrahepatic AE were recorded and analyzed by experienced radiologists. The MSCT and MRI agreements for detecting imaging features of extrahepatic AE were calculated using kappa statistics.Results. All cases secondary to hepatic AE, except two primary extrahepatic AE, were found in this study. Locations of extrahepatic AE included 19 (57.6%) lung, 10 (30.3%) adrenal gland, 9 (27.3%) brain, 5 (15.2%) peritoneal cavity, 5 (15.2%) spleen, 4 (12.1%) diaphragm, 3 (9.1%) kidney, 3 (9.1%) retroperitoneal, and 2 (6.1%) vertebra; Involvement of 1 (3.0%) heart, 1 (3.0%) mediastinum, 1 (3.0%) muscle, and 1 (3.0%) pancreas was rare. AE of the lung usually appeared as irregular and scattered nodules with small vacuoles or cavities inside and peripheral distribution. Multiple cerebral nodules with calcification and surrounding edema were the most common features seen in brain AE. Adrenal gland AE presented as plaques containing different sizes of hypodense areas and different amounts of calcification. Injection of contrast medium showed no enhancement of lesions except in the brain. Very good agreements were seen between MSCT and MR for detecting number (κ=0.841, p=0.000), border (κ=0.911, p=0.000) and size (κ=0.864, p=0.000) of extrahepatic AE.Conclusions. MSCT and MRI are reliable imaging methods for the diagnosis of extrahepatic AE. When one AE patient is clinically confirmed, MSCT scan from the head to pelvis should be performed to exclude other organs AE.

Vaginal masses: magnetic resonance imaging features with pathologic correlation

2007 ◽  
Vol 48 (8) ◽  
pp. 921-933 ◽  
Author(s):  
K. M. Elsayes ◽  
V. R. Narra ◽  
J. R. Dillman ◽  
V. Velcheti ◽  
O. Hameed ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Imaging Features ◽  
Resonance Imaging ◽  
Cross Sectional ◽  
Pelvic Mri ◽  
Mri Features ◽  
Cross Sectional Imaging ◽  
Magnetic Resonance Imaging Mri

The detection of vaginal lesions has increased with the expanding use of cross-sectional imaging. Magnetic resonance imaging (MRI)—with its high-contrast resolution and multiplanar capabilities—is often useful for characterizing vaginal masses. Vaginal masses can be classified as congenital, inflammatory, cystic (benign), and neoplastic (benign or malignant) in etiology. Recognition of the typical MR imaging features of such lesions is important because it often determines the treatment approach and may obviate surgery. Finally, vaginal MR imaging can be used to evaluate post-treatment changes related to previous surgery and radiation therapy. In this article, we will review pertinent vaginal anatomy, vaginal and pelvic MRI technique, and the MRI features of a variety of vaginal lesions with pathological correlation.

scholarly journals Non-Ketotic Hyperglycemia Induced Hemichorea-Hemiballism May Represent Glioma-Like Pattern On Multimodal Magnetic Resonance Imaging: Can 1H Spectroscopy Help In The Differentiation?

2021 ◽  
Author(s):  
Yu Lin ◽  
Xiaoxiao Zhang ◽  
Xin Yue ◽  
Jinan Wang
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mass Effect ◽  
Resonance Spectroscopy ◽  
Resonance Imaging ◽  
Functional Changes ◽  
Magnetic Resonance Imaging Mri ◽  
T2 Hyperintensity ◽  
The Right ◽  
Ketotic Hyperglycemia

Abstract Background: Non-ketotic hyperglycemia (NKH) induced hemichorea-hemiballismus (HC-HB) is a rare reversible condition predominantly found in elderly patients with poorly controlled diabetics. Here, we describe two cases of NKH induced HC-HB with distinctive morphological and functional changes on conventional magnetic resonance imaging (MRI), diffusion-weighted imaging (DWI) and 1H magnetic resonance spectroscopy (MRS).Case presentation: In case 1 with NKH induced HC-HB, computer tomography depicted increased attenuation in the left putamen and caudate nucleus. Focal T2-hyperintensity, obvious mass effect and ring-like enhancement were revealed on conventional MRI, suggesting the imaging findings of glioma. DWI indicated the lesion with unrestricted diffusion of water molecule. MRS further illustrated markedly increased lactate (Lac) and lipids (Lip), slightly elevated choline (Cho), and slightly decreased N-acetylaspartate (NAA) within the lesion. In case 2, baseline and follow-up MRI showed a lesion with typical reversible signal intensity in the right putamen without mass effect.Conclusions: This report emphasizes that NKH induced HC-HB may exhibit a unique appearance mimicking glioma. Slightly elevated Cho/NAA ratio with marked increased Lac peak on MRS may help to exclude neoplastic diseases.

What insights have new imaging techniques given into aggressive forms of MS – different forms of MS or different from MS?

2009 ◽  
Vol 15 (3) ◽  
pp. 285-293 ◽  
Author(s):  
A Pichiecchio ◽  
E Tavazzi ◽  
G Maccabelli ◽  
CM Precupanu ◽  
A Romani ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Imaging Techniques ◽  
Magnetization Transfer ◽  
Resonance Spectroscopy ◽  
Review Of Literature ◽  
Resonance Imaging ◽  
Disease Mechanisms ◽  
Magnetic Resonance Imaging Mri

“Aggressive” multiple sclerosis (MS) is still a challenging diagnosis, in spite of the relevant progresses concerning the comprehension of the disease mechanisms, especially through pathology studies and the advent of conventional magnetic resonance imaging (MRI). Some reviews have been already published on their clinical and therapeutical aspects, but no systematic review is available in literature about the neuroradiological features, using both conventional and advanced techniques. In particular, advanced MRI techniques, namely diffusion-weighted and tensor imaging, magnetization transfer imaging, and proton magnetic resonance spectroscopy, are giving new insights to find specific and appropriate radiological parameters that can help in targeting the diagnosis. We report a review of literature on the neuroradiological findings of aggressive forms of MS, focusing specifically on the role of advanced MRI techniques in the diagnostic phase and during follow-up.

scholarly journals Atypical magnetic resonance imaging features and differential diagnosis of hepatocellular carcinoma

2020 ◽  
Vol 48 (10) ◽  
pp. 030006052094341
Author(s):  
Shuang-Yu Wang ◽  
Lei Yin ◽  
Chen Wang ◽  
Ming-Ping Ma
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hepatocellular Carcinoma ◽  
Magnetic Resonance ◽  
Diagnostic Accuracy ◽  
Central Star ◽  
High Signal ◽  
Imaging Features ◽  
Resonance Imaging ◽  
Mri Features ◽  
Magnetic Resonance Imaging Mri

Objective Hepatocellular carcinoma (HCC) is the most common primary malignant tumor of the liver. We aimed to summarize and analyze the atypical magnetic resonance imaging (MRI) features of HCC to improve its diagnostic accuracy. Methods We retrospectively analyzed MRI data for 66 patients with HCC with atypical MRI features confirmed by operation and pathology. Results Twelve patients had high signals and 18 patients had significant decreases in opposed phase signals in T1WI plain scans. Nine patients had high signals and six patients had large cystic lesions in apparent diffusion coefficient images. Dynamic enhancement showed progressive enhancement in 15 patients, ring enhancement in three, irregular patchy enhancement in three, ‘nodule-in-nodule’ enhancement in six, delayed central patchy enhancement in six, delayed central ‘star-like aristate scars’ (T2WI revealed high signal intensity) in 21, and poor blood supply in three patients. Conclusions MRI can make a clear diagnosis of typical HCC, and atypical cases can also be distinguished from other tumors or tumor-like lesions by MRI. The analysis of atypical signs may improve the diagnostic accuracy of MRI for HCC.

A case review of the MRI features in alternating Tolosa–Hunt syndrome

Cephalalgia ◽  
2010 ◽  
Vol 30 (9) ◽  
pp. 1133-1136 ◽  
Author(s):  
BVS Guedes ◽  
AJ da Rocha ◽  
HB Zuppani ◽  
CJ da Silva ◽  
WL Sanvito
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Laboratory Data ◽  
Imaging Features ◽  
Case Review ◽  
Resonance Imaging ◽  
Hunt Syndrome ◽  
Mri Features ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Study

Tolosa–Hunt syndrome (THS) consists of a painful ophthalmoplegia with typical features in magnetic resonance imaging (MRI). The recurring nature of this affliction has been known since its first description. However, compromise of the contralateral cavernous sinus, known as alternating THS, is very rare and has never been examined using MRI. We report clinical data, laboratory data and imaging features of a patient with alternating THS. According to our literature review, this is the first MRI study of THS.

Grey matter abnormalities in multiple sclerosis: proton magnetic resonance spectroscopic imaging

2001 ◽  
Vol 7 (4) ◽  
pp. 221-226 ◽  
Author(s):  
Rakesh Sharma ◽  
Ponnada A Narayana ◽  
Jerry S Wolinsky
Keyword(s):  
Multiple Sclerosis ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetization Transfer ◽  
Spectroscopic Imaging ◽  
Magnetic Resonance Spectroscopic Imaging ◽  
Relapsing Remitting ◽  
Cortical Gray Matter ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Characteristics

Pathologically defined abnormalities in the cortical gray matter (GM) are well described in multiple sclerosis (MS) but are infrequently seen by conventional magnetic resonance imaging (MRI). We systematically evaluated 52 relapsing - remitting MS patients and 20 normal volunteers with high resolution MRI and short echo proton magnetic resonance spectroscopic imaging (MRSI). Individual tissue contributions to the spectroscopic voxels were estimated based on MRI that incorporated both CSF suppression and magnetization transfer, or double inversion images in which both CSF and GM were suppressed. Strong resonances in the 0.8 to 1.5 p.p.m. spectral region were observed in 13 MS patients. Image segmentation based on the MRI characteristics of tissues contributing to the spectroscopic voxels showed that these additional peaks originated mainly from GM. The presence of these additional peaks suggests that the normal appearance GM on MRI, is biochemically abnormal in a substantial proportion of relapsing-remitting MS patients.

Magnetic Resonance Imaging in the Diagnosis of Disruption of the Posterior Tibial Tendon

Foot & Ankle ◽  
1987 ◽  
Vol 8 (3) ◽  
pp. 144-147 ◽  
Author(s):  
Ian J. Alexander ◽  
Kenneth A. Johnson ◽  
Thomas H. Berquist
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Soft Tissues ◽  
Diagnostic Technique ◽  
Clinical Findings ◽  
The Body ◽  
Posterior Tibial Tendon ◽  
Resonance Imaging ◽  
Posterior Tibial ◽  
Magnetic Resonance Imaging Mri

Magnetic resonance imaging (MRI), a useful technique of studying soft tissues of the body, can be very effective in assessing the integrity of tendons. Usually a patient with a complete tear of the posterior tibial tendon has characteristic physical findings. In the patient presented, MRI demonstrated a complete disruption of the posterior tibial tendon, despite the absence of the commonly associated clinical findings. In view of the difficulties encountered with attempted tenography of the completely torn posterior tibial tendon, MRI provides a sensitive alternative diagnostic technique.

Audit of regional screening guidelines for vestibular schwannoma

1998 ◽  
Vol 112 (9) ◽  
pp. 860-864 ◽  
Author(s):  
P. J. D. Dawes ◽  
J.-P. Jeannon
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Posterior Fossa ◽  
Vestibular Schwannoma ◽  
Acoustic Neuroma ◽  
Resonance Imaging ◽  
Posterior Fossa Tumour ◽  
Screening Guidelines ◽  
Magnetic Resonance Imaging Mri

AbstractAn audit of 334 patients who underwent magnetic resonance imaging (MRI) as investigation for a possible diagnosis of vestibular schwannoma was carried out to assess adherence to previously agreed screening guidelines. This represents one year's activity. A posterior fossa tumour was identified in 12 patients. Scan requests were judged to be inappropriate for 28 cases. The issues surrounding the screening for acoustic neuroma are discussed.

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