scholarly journals The role of 3D volumetric MR sequences in diagnosing intraventricular neurocysticercosis: preliminar results

2011 ◽  
Vol 69 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Francisco Edward Frota Mont'Alverne Filho ◽  
Luís dos Ramos Machado ◽  
Leandro Tavares Lucato ◽  
Claudia Costa Leite
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Three Dimensional ◽  
Fast Imaging ◽  
Cystic Lesions ◽  
Resonance Imaging ◽  
Mri Protocol ◽  
Mri Sequences ◽  
Mr Sequences

OBJECTIVE: The purpose of this paper was to investigate the role of two three-dimensional magnetic resonance (MRI) sequences: enhanced spoiled gradient recalled echo (SPGR), and fast imaging employing steady-state acquisition (FIESTA) in the evaluation of intraventricular neurocysticercosis cysts and scolices. METHOD: Seven neurocysticercosis patients suspected of presenting intraventricular lesions were evaluated by magnetic resonance imaging using enhanced SPGR, and FIESTA. RESULTS: Enhanced SPGR detected eight cystic lesions, with scolices in four. Contrast enhancement was observed in three cysts. FIESTA also detected eight cystic lesions with the presence of scolices in seven of those cystic lesions. Four patients presented parenchymal involvement, while the remaining three presented the racemose form. CONCLUSION: FIESTA and SPGR are sequences that can detect intraventricular cysts of neurocysticercosis, and FIESTA also is good for the detection of the scolex. Considering this information we suggest that FIESTA and SPGR should be included in the MRI protocol for the investigation of intraventricular neurocysticercosis.

scholarly journals Magnetic Resonance Imaging of the Anal Region: Clinical Applications

2020 ◽  
Vol 10 ◽  
pp. 76
Author(s):  
Giuseppe Cicero ◽  
Giorgio Ascenti ◽  
Alfredo Blandino ◽  
Socrate Pallio ◽  
Claudia Abate ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Anal Canal ◽  
Three Dimensional ◽  
Resonance Imaging ◽  
Pictorial Review ◽  
Clinical Scenarios ◽  
Mri Protocol ◽  
Magnetic Resonance Imaging Mri ◽  
Dedicated Mri

Over the past years, magnetic resonance imaging (MRI) has become a cornerstone in evaluating anal canal and adjacent tissues due to its safeness, the three-dimensional and comprehensive approach, and the high soft-tissue resolution. Several diseases arising in the anal canal can be assessed through MRI performance, including congenital conditions, benign pathologies, and malignancies. Good knowledge of the normal anatomy and MRI technical protocols is, therefore, mandatory for appropriate anal pathology evaluation. Radiologists and clinicians should be familiar with the different clinical scenarios and the anatomy of the structures involved. This pictorial review presents an overview of the diseases affecting the anal canal and the surrounding structures evaluated with dedicated MRI protocol.

Role of Interface Sign and Diffusion-Weighted Magnetic Resonance Imaging in Differential Diagnosis of Exophytic Renal Masses

2019 ◽  
Vol 70 (2) ◽  
pp. 147-155
Author(s):  
Fatma Kulali ◽  
Safak Firat Kulali ◽  
Aslihan Semiz-Oysu ◽  
Burcu Kaya-Tuna ◽  
Yasar Bukte
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Cystic Lesions ◽  
Resonance Imaging ◽  
Renal Masses ◽  
Diffusion Weighted ◽  
Adc Values ◽  
Malignant Lesions

Purpose We aimed to investigate the role of interfaces of exophytic solid and cystic renal masses on magnetic resonance imaging (MRI) and the added value of diffusion-weighted imaging in differentiating benign from malignant lesions. Methods The Institutional Review Board approved this retrospective study, and informed consent was waived. A total of 265 patients (109 [41%] women and 156 [59%] men) with a mean age of 57 ± 12 (standard deviation) years were enrolled in this study. Preoperative MRI (n = 238) examinations of patients with solid or cystic renal masses and MRI (n = 27) examinations of patients with Bosniak IIF cysts without progression were reviewed. Solid/cystic pattern, interface types and apparent diffusion coefficient (ADC) values were recorded by 2 radiologists. The diagnostic performance of combining normalized ADC values with interface sign were evaluated. Results Among 265 renal lesions (109 cystic and 156 solid), all malignant lesions (n = 192) had a round interface. No malignant lesions showed an angular interface. For prediction of benignity in cystic lesions, sensitivity (82.86% vs 56.16%), negative predictive value (92.50% vs 85.71%), and accuracy (94.50% vs 87.92%) ratios of angular interface were higher compared to all (solid plus cystic) lesions. The best normalized ADC cutoff values for predicting malignancy in lesions with round interface were as follows: for all (solid plus cystic), ≤ 0.75 (AUROC = 0.804); solid, ≤ 0.6 (AUROC = 0.819); and cystic, ≤ 0.8 (AUROC = 0.936). Conclusions Angular interface can be a predictor of benignity for especially cystic renal masses. The evaluation of interface type with normalized ADC value can be an important clue in differential diagnosis especially in patients avoiding contrast.

The role of magnetic resonance imaging in the diagnosis of brachial plexopathy in a COVID-19 patient

2020 ◽  
pp. 1-4
Keyword(s):  
Magnetic Resonance Imaging ◽  
Intensive Care ◽  
Magnetic Resonance ◽  
Brachial Plexus ◽  
Early Recognition ◽  
Brachial Plexopathy ◽  
Resonance Imaging ◽  
Intensive Care Admission ◽  
Mri Protocol

Severe COVID-19 infection can lead to acute respiratory distress syndrome (ARDS) requiring intensive care admission. Mechanically ventilated patients are commonly managed by being positioned in a prone ‘swimmer’s position’. However, this position can lead to a variety of potential complications not related to the illness, including stretching of the brachial plexus resulting in nerve damage. Brachial plexopathy is an important consideration in all patients stepped down from prolonged prone ventilation. This is to prevent possible long-term numbness and weakness in the affected arm which may require intensive physiotherapy. The role of magnetic resonance imaging is particularly useful in visualizing the brachial plexus and providing an accurate diagnosis. Early recognition and prompt imaging is recommended to reduce the incidence and severity of brachial plexopathy, particularly in the wake of a second COVID-19 wave. We report a case of brachial plexopathy in a 54-year-old male following intensive care admission and the relevant MRI protocol and findings which highlight this pathology.

Three-dimensional Fast Imaging Employing Steady-state Acquisition Magnetic Resonance Imaging for Stereotactic Radiosurgery of Trigeminal Neuralgia

Neurosurgery ◽  
2005 ◽  
Vol 56 (3) ◽  
pp. E628-E628 ◽  
Author(s):  
Gabriela-del-Rocío Chávez Chávez ◽  
Antonio A.F. De Salles ◽  
Timothy D. Solberg ◽  
Alessandra Pedroso ◽  
Dulce Espinoza ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Steady State ◽  
Magnetic Resonance ◽  
Trigeminal Neuralgia ◽  
Stereotactic Radiosurgery ◽  
Trigeminal Nerve ◽  
Three Dimensional ◽  
Fast Imaging ◽  
Resonance Imaging ◽  
Entry Zone

Abstract OBJECTIVE: The aim of this study was to demonstrate the use and applications of the three-dimensional fast imaging employing steady-state acquisition (3-D-FIESTA) magnetic resonance imaging sequence in targeting and planning for stereotactic radiosurgery of trigeminal neuralgia. METHODS: A 3-D-FIESTA sequence for visualization of cranial nerves in the cranial base was added to the routine magnetic resonance imaging scan to enhance the treatment planning for trigeminal neuralgia. T1-weighted images, 1 mm thick, were directly compared with the FIESTA sequence for the exact visualization of the trigeminal entry zone and surrounding vasculature. The target accuracy was evaluated by image fusion of computed tomographic and magnetic resonance imaging scans. The anatomy visualized with the FIESTA sequence was validated by direct inspection of the gross anatomic specimens of the trigeminal complex. RESULTS: A total of 15 consecutive patients, 10 women and 5 men, underwent radiosurgery for essential trigeminal neuralgia between April and July, 2003. The mean age of the patients was 65.2 years (range, 24–83 yr). Nine patients had right-sided symptoms. Four patients had had previous surgery (two microvascular decompression, one percutaneous rhizotomy, and one radiofrequency thermocoagulation). The 3-D-FIESTA sequence successfully demonstrated the trigeminal complex (root entry zone, trigeminal ganglion, rootlets, and vasculature) in 14 patients (93.33%). The 3-D-FIESTA sequence also allowed visualization of the branches of the trigeminal nerve inside Meckel's cavity. This exact visualization correlated precisely with the anatomic specimens. In one patient (6.66%), it was not possible to demonstrate the related vasculature. However, the other structures were clearly visualized. CONCLUSION: The 3-D-FIESTA sequence is used in this study for demonstration of the exact anatomy of the trigeminal complex for the purpose of radiosurgical planning and treatment of trigeminal neuralgia. With such imaging techniques, radiosurgical targeting of specific trigeminal nerve branches may be feasible. It has not been possible previously to target individual branches of the trigeminal nerve.

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