1
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Steller J, Gargus JJ, Gibbs LH, Hasso AN, Kimonis VE. Mild phenotype in a male with pyruvate dehydrogenase complex deficiency associated with novel hemizygous in-frame duplication of the E1α subunit gene (PDHA1). Neuropediatrics 2014; 45:56-60. [PMID: 23572181 DOI: 10.1055/s-0033-1341601] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Pyruvate dehydrogenase complex (PDHC) deficiency is an inborn error of metabolism that occurs most commonly due to mutations in the X-linked E1α subunit gene (PDHA1). We report a novel duplication of PDHA1 associated with a mild phenotype in a 15-year-old boy who was diagnosed with PDHC deficiency at 4 years of age following a history of seizures and lactic acidosis. The novel c.1087_1119 mutation in exon 11 resulted in an in-frame duplication of 11 amino acids. Measurements of PDHC activity in cultured skin fibroblasts were low, corresponding to 18.6 and 11.6% of the mean with respect to prior controls, whereas the E1 PDH component was absent. He has borderline intellectual functioning and maintains normal lactate levels on a ketogenic diet in between relapses due to illness. Review of the literature reveals wide variation of clinical phenotype in patients with mutations of the E1α subunit gene (PDHA1). There appears to be a higher incidence of normal or borderline intellectual ability in individuals who have insertions or deletions that are in-frame versus those that are out-of-frame. Furthermore, there is no correlation between mean residual PDH activity and phenotype in these patients.
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Affiliation(s)
- J Steller
- Division of Genetics and Metabolism, Department of Pediatrics, University of California-Irvine, Orange, California, United States
| | - J J Gargus
- Division of Genetics and Metabolism, Department of Pediatrics, University of California-Irvine, Orange, California, United States
| | - L H Gibbs
- Department of Radiology, University of California-Irvine, Orange, California, United States
| | - A N Hasso
- Department of Radiology, University of California-Irvine, Orange, California, United States
| | - V E Kimonis
- Division of Genetics and Metabolism, Department of Pediatrics, University of California-Irvine, Orange, California, United States
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2
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Mamlouk MD, Handwerker J, Ospina J, Hasso AN. Neuroimaging findings of the post-treatment effects of radiation and chemotherapy of malignant primary glial neoplasms. Neuroradiol J 2013; 26:396-412. [PMID: 24007728 PMCID: PMC4202820 DOI: 10.1177/197140091302600405] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2013] [Accepted: 06/30/2013] [Indexed: 01/24/2023] Open
Abstract
Post-treatment radiation and chemotherapy of malignant primary glial neoplasms present a wide spectrum of tumor appearances and treatment-related entities. Radiologic findings of these post-treatment effects overlap, making it difficult to distinguish treatment response and failure. The purposes of this article are to illustrate and contrast the imaging appearances of recurrent tumor from necrosis and to discuss other radiologic effects of cancer treatments. It is critical for radiologists to recognize these treatment-related effects to help direct clinical management.
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Affiliation(s)
- M D Mamlouk
- Department of Radiology, University of California; Irvine, Orange, CA, USA -
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3
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Allen LM, Fowler AM, Walker C, Derdeyn CP, Nguyen BV, Hasso AN, Ghodke BV, Zipfel GJ, Cross DT, Moran CJ. Retrospective review of cerebral mycotic aneurysms in 26 patients: focus on treatment in strongly immunocompromised patients with a brief literature review. AJNR Am J Neuroradiol 2013; 34:823-7. [PMID: 23064596 DOI: 10.3174/ajnr.a3302] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Cerebral mycotic aneurysms are a rare and deadly type of aneurysm that have no definitive treatment guidelines. Our purpose was to retrospectively review known or suspected cases of CMA in order to identify patient populations that may be associated with higher morbidity and mortality. We hope that the identification of patients with these risk factors will lead to early stratification upon presentation, and more urgent treatment of their CMAs. We also hoped to identify any benefit or complication that was specific to either the endovascular or neurosurgical repair of CMAs. MATERIALS AND METHODS A retrospective multi-institutional study was performed examining cases of CMA during a 15-year period. Patients were considered strongly immunocompromised if there were long-term severely immunocompromised states: AIDS, chemotherapy, or steroid immunosuppression. Patients were excluded if angiographic findings suggested an alternative diagnosis or if an infectious etiology was unknown. Antibiotics were considered "noninvasive treatment." Endovascular and neurosurgical repair were considered "invasive treatment." Data were recorded by reviewing electronic medical records and imaging reports. RESULTS Twenty-six patients with 40 CMAs were included. Three patients were considered strongly immunocompromised and presented with 4 CMAs, which demonstrated larger average size and more rapid growth; 3 of these patients' aneurysms were treated invasively in the acute period, with the one that was not ruptured causing death. Technical success (aneurysm occlusion without rupture or recanalization) and clinical success (no neurologic complication attributable to the intervention) were obtained equally endovascularly and neurosurgically. Clipping was aborted in favor of coiling for 1 patient. Anticoagulation needed reversal before 2 patients underwent craniotomy for clipping after valve replacement. For CMAs treated with antibiotics alone with angiographic follow-up (n=11), initial aneurysm size was unrelated to persistence and 64% completely regressed. CONCLUSIONS We recommend initial invasive treatment for CMAs in strongly immunocompromised patients. Testing for underlying immunocompromised states is warranted in patients with CMAs. Endovascular treatment is favored over neurosurgical treatment in patients requiring acute cardiac valve repair due to delays with anticoagulation reversal.
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Affiliation(s)
- L M Allen
- Department of Radiological Sciences, University of California, Irvine, Orange, California, USA.
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4
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Jensen RL, Abraham S, Hu N, Jensen RL, Boulay JL, Leu S, Frank S, Vassella E, Vajtai I, von Felten S, Taylor E, Schulz M, Hutter G, Sailer M, Hench J, Mariani L, van Thuijl HF, Scheinin I, van Essen DF, Heimans JJ, Wesseling P, Ylstra B, Reijneveld JC, Borges AR, Larrubia PL, Marques JMB, Cerdan SG, Brastianos P, Horowitz P, Santagata S, Jones RT, McKenna A, Getz G, Ligon K, Palescandolo E, Van Hummelen P, Stemmer-Rachamimov A, Louis D, Hahn WC, Dunn I, Beroukhim R, Guan X, Vengoechea J, Zheng S, Sloan A, Chen Y, Brat D, O'Neill BP, Cohen M, Aldape K, Rosenfeld S, Noushmehr H, Verhaak RG, Barnholtz-Sloan J, Bahassi EM, Li YQ, Cross E, Li W, Vijg J, McPherson C, Warnick R, Stambrook P, Rixe O, Manterola L, Tejada-Solis S, Diez-Valle R, Gonzalez M, Jauregui P, Sampron N, Barrena C, Ruiz I, Gallego J, Delattre JY, de Munain AL, Mlonso MM, Saito K, Mukasa A, Nagae G, Aihara K, Takayanagi S, Aburatani H, Saito N, Kong XT, Fu BD, Du S, Hasso AN, Linskey ME, Bota D, Li C, Chen YS, Chen ZP, Kim CH, Cheong JH, Kim JM, Yelon NP, Jacoby E, Cohen ZR, Ishida J, Kurozumi K, Ichikawa T, Onishi M, Fujii K, Shimazu Y, Date I, Narayanan R, Ho QH, Levin BS, Maeder ML, Joung JK, Nutt CL, Louis DN, Thorsteinsdottir J, Fu P, Gehrmann M, Multhoff G, Tonn JC, Schichor C, Thirumoorthy K, Gordon N, Walston S, Patel D, Okamoto M, Chakravarti A, Palanichamy K, French P, Erdem L, Gravendeel L, de Rooi J, Eilers P, Idbaih A, Spliet W, den Dunnen W, Teepen J, Wesseling P, Smitt PS, Kros JM, Gorlia T, van den Bent M, McCarthy D, Cook RW, Oelschlager K, Maetzold D, Hanna M, Wick W, Meisner C, Hentschel B, Platten M, Sabel MC, Koeppen S, Ketter R, Weiler M, Tabatabai G, Schilling A, von Deimling A, Gramatzki D, Westphal M, Schackert G, Loeffler M, Simon M, Reifenberger G, Weller M, Moren L, Johansson M, Bergenheim T, Antti H, Sulman EP, Goodman LD, Wani KM, DeMonte F, Aldape KD, Krischek B, Gugel I, Aref D, Marshall C, Croul S, Zadeh G, Nilsson CL, Sulman E, Liu H, Wild C, Lichti CF, Emmett MR, Lang FF, Conrad C, Alentorn A, Marie Y, Boisselier B, Carpetier C, Mokhtari K, Hoang-Xuan K, Capelle L, Delattre JY, Idbaih A, Lautenschlaeger T, Huebner A, McIntyre JB, Magliocco T, Chakravarti A, Hamilton M, Easaw J, Pollo B, Calatozzolo C, Vuono R, Guzzetti S, Eoli M, Silvani A, Di Meco F, Filippini G, Finocchiaro G, Joy A, Ramesh A, Smirnov I, Reiser M, Shapiro W, Mills G, Kim S, Feuerstein B, Gonda DD, Li J, McCabe N, Walker S, Goffard N, Wikstrom K, McLean E, Greenan C, Delaney T, McCarthy M, McDyer F, Keating KE, James IF, Harrison T, Mullan P, Harkin DP, Carter BS, Kennedy RD, Chen CC, Patel AS, Allen JE, Dicker DT, Rizzo K, Sheehan JM, Glantz MJ, El-Deiry WS, Salhia B, Ross JT, Kiefer J, Van Cott C, Metpally R, Baker A, Sibenaller Z, Nasser S, Ryken T, Ramanathan R, Berens ME, Carpten J, Tran NL, Bi Y, Pal S, Zhang Z, Gupta R, Macyszyn L, Fetting H, O'Rourke D, Davuluri RV, Ezrin AM, Moore K, Stummer W, Hadjipanayis CG, Cahill DP, Beiko J, Suki D, Prabhu S, Weinberg J, Lang F, Sawaya R, Rao G, McCutcheon I, Barker FG, Aldape KD, Trister AD, Bot B, Fontes K, Bridge C, Baldock AL, Rockhill JK, Mrugala MM, Rockne RR, Huang E, Swanson KR, Underhill HR, Zhang J, Shi M, Lin X, Mikheev A, Rostomily RC, Scheck AC, Stafford P, Hughes A, Cichacz Z, Coons SW, Johnston SA, Mainwaring L, Horowitz P, Craig J, Garcia D, Bergthold G, Burns M, Rich B, Ramkissoon S, Santagata S, Eberhart C, Ligon A, Goumnerova L, Stiles C, Kieran M, Hahn W, Beroukhim R, Ligon K, Ramkissoon S, Olausson KH, Correia J, Gafni E, Liu H, Theisen M, Craig J, Hayashi M, Haidar S, Maire C, Mainwaring LA, Burns M, Norden A, Wen P, Stiles C, Ligon A, Kung A, Alexander B, Tonellato P, Ligon KL. LAB-OMICS AND PROGNOSTIC MARKERS. Neuro Oncol 2012. [DOI: 10.1093/neuonc/nos231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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5
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Mamlouk MD, Tsai FY, Drachman D, Stradling D, Hasso AN. Cerebral thromboembolism: value of susceptibility-weighted imaging in the initial diagnosis of acute infarction. Neuroradiol J 2012; 25:45-56. [PMID: 24028876 DOI: 10.1177/197140091202500107] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Accepted: 01/03/2012] [Indexed: 11/16/2022] Open
Abstract
Susceptibility-weighted imaging (SWI) is commonly used to diagnose cerebral hemorrhage, calcification, and other T2* lesions. Its role in the detection of cerebral thromboemboli has been suggested for emboli of the anterior division of the middle cerebral artery (MCA). The purpose of our study was to determine SWI's accuracy and sensitivity in detection of all sites of cerebral thromboemboli, not just MCA emboli. Two neuroradiologists retrospectively reviewed consecutive MRI brain examinations with SWI for cerebral thromboemboli in 100 patients with clinical suspicion for stroke determined by the NIH Stroke Scale (NIHSS) score. FLAIR, MRA, CT, and catheter angiography were reviewed for thromboemboli in the same patients. Thromboembolic sites included: the internal carotid artery (ICA) terminus, anterior MCA, posterior MCA, any other cerebral artery, or if not present. The exclusion criteria included: no magnetic resonance angiogram (MRA) or catheter angiogram for comparison, lack of restricted diffusion, lacunar infarcts, and the presence of massive hemorrhage. The accuracy, sensitivity, and specificity of each imaging modality were determined. Twenty-four patients were excluded based on the aforementioned criteria. Cerebral thromboemboli were identified in 35 of the remaining 76 patients. Of the 35 patients with thromboemboli, 30 were identified on SWI. FLAIR detected 22/35 emboli, MRA 30/33, CT 18/35, and catheter angiography 12/12. The accuracies for SWI, FLAIR, and CT were 97%, 84%, and 74%, respectively. The sensitivities for SWI, FLAIR, and CT were 85%, 61%, and 52%, respectively. The specificities for SWI, FLAIR, and CT were 100%, 98%, and 93%, respectively. There is an adjunctive role of SWI to identify cerebral thromboemboli in patients with acute infarction. SWI is superior to FLAIR and CT, and complementary to MRA and catheter angiography in emboli detection. This study supports SWI detection of MCA emboli, but also emphasizes its utility in emboli detection of other arteries based on a high accuracy and sensitivity.
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Affiliation(s)
- M D Mamlouk
- Department of Radiology, University of California; Irvine, Orange, CA, USA -
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6
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Maasumi K, Tehranzadeh J, Muftuler LT, Gardner V, Hasso AN. Assessment of the Correlation between Apparent Diffusion Coefficient and Intervertebral Disk Degeneration Using 3 Tesla MRI. Neuroradiol J 2011; 24:593-602. [PMID: 24059718 DOI: 10.1177/197140091102400416] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 02/28/2011] [Indexed: 11/16/2022] Open
Abstract
The objective is to use DW-MR imaging using 3 Tesla MRI to assess the correlation between the mean ADC with degenerative disk disease (DDD). We recruited 34 subjects and used DWI-MR to image lumbar intervertebral disks. We acquired a T2W scan and DWIs. The disks were graded for DDD. Assessment of correlation between mean ADC was made. 170 disks were evaluated. The observed sample correlation between mean ADC and disk degeneration was r = 0.65 [0.55-0.73]. The observed sample correlation between mid-sagittal ADC and disk degeneration was r = 0.61 [0.51-0.70]. The differences between mean ADC of each grade were significant, except between grades 4 and 5. There is a correlation of 0.65 between the mean ADC and disk degeneration. This correlation is not strong enough to use the ADC to determine DDD in clinical settings. There was no evident difference in ADC between the studied anatomic lumbar levels.
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Affiliation(s)
- K Maasumi
- Department of Neurology, University of California; Irvine, CA, USA -
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7
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Abstract
A recent study carried out at the University of California, Irvine exemplifies a commonly overlooked ethical conundrum of neuroimaging research: incidental findings. Research study designs must address the potential of uncovering unexpected findings in subjects during the study and delineate a protocol for reporting and initiating treatment. We urge the community to petition their home institutional review board to mandate inclusion of an incidental findings protocol into all neuroimaging research applications.
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Affiliation(s)
- D A Brown
- School of Medicine, University of California, Irvine, Orange, CA 92668-3298, USA
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8
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Stradling D, Yu W, Langdorf ML, Tsai F, Kostanian V, Hasso AN, Welbourne SJ, Schooley Y, Fisher MJ, Cramer SC. Stroke care delivery before vs after JCAHO stroke center certification. Neurology 2007; 68:469-70. [PMID: 17283326 DOI: 10.1212/01.wnl.0000252930.82140.65] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- D Stradling
- Department Neurology, University of California Irvine Medical Center, 101 The City Drive South, Building 53 Room 203, Orange, CA 92868-4280, USA
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9
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Abstract
Whereas CT imaging techniques such as multiple detector spiral imaging with multi-planar reconstructions are desirable in the evaluation of congenital and developmental anomalies of the midface and skull base, there is an essential role for MRI whenever there are related intracranial anomalies. This presentation will focus on describing and classifying the known craniofacial anomalies that have common manifestations in the sinonasal regions, the orbits, and the skull base. Diagrams and clinical cases are utilized to demonstrate the key embryological events leading to the common dysplasias of the craniofacial and sinonasal regions.
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Affiliation(s)
- A N Hasso
- University of California Irvine, UCI Medical Center; Orange, USA -
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10
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Gibbs WN, Monuki ES, Linskey ME, Hasso AN. Pituicytoma: diagnostic features on selective carotid angiography and MR imaging. AJNR Am J Neuroradiol 2006; 27:1639-42. [PMID: 16971602 PMCID: PMC8139775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We report a case of pituicytoma, a rare primary tumor of the neurohypophysis. A 64-year-old man presented with progressive visual complaints, bitemporal hemianopsia, and headache. Imaging studies revealed distinctive features of a mass lesion that thickened the pituitary stalk with a bilobed protrusion extending into the hypothalamus. Angiography demonstrated tumor vascular supply from the superior hypophyseal arteries representing the diencephalic branches of the internal carotid arteries. We discuss the imaging and pathology of this unusual tumor.
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Affiliation(s)
- W N Gibbs
- School of Medicine, University of California, Irvine, CA, USA
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11
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Hasso AN. Advancing head and neck radiology into the 21st century. AJR Am J Roentgenol 2000; 175:1507-8. [PMID: 11090364 DOI: 10.2214/ajr.175.6.1751507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- A N Hasso
- Department of Radiological Sciences, University of California Irvine Medical Center, Orange, CA 92868-3298, USA
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12
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Hasso AN, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Vertigo and hearing loss. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:471-8. [PMID: 11037458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- A N Hasso
- University of California Irvine Medical Center, Orange, USA
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13
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Deck MD, Drayer BP, Anderson RE, Braffman B, Davis PC, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Imaging of intracranial infections. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:535-45. [PMID: 11037464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- M D Deck
- Cornell Medical Center, New York, NY, USA
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14
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Masaryk T, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Cerebrovascular disease. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:415-35. [PMID: 11037455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- T Masaryk
- Cleveland Clinic Foundation, Ohio, USA
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15
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Tanenbaum L, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Masdeu JC. Epilepsy. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:459-70. [PMID: 11037457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- L Tanenbaum
- New Jersey Neuroscience Institute/JFK Medical Center, Edison, USA
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16
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Braffman B, Drayer BP, Anderson RE, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Neurodegenerative disorders. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:597-605. [PMID: 11037470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- B Braffman
- Memorial Regional Hospital, University of Miami, Hollywood, Fla., USA
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17
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Seidenwurm D, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Tanenbaum L, Masdeu JC. Myelopathy. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:495-505. [PMID: 11037461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- D Seidenwurm
- Radiological Associates of Sacramento, Calif., USA
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18
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Seidenwurm D, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Tanenbaum L, Masdeu JC. Neuroendocrine imaging. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:563-71. [PMID: 11037466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- D Seidenwurm
- Radiological Associates of Sacramento, Calif., USA
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19
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Anderson RE, Drayer BP, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Spine trauma. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:589-95. [PMID: 11037469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- R E Anderson
- Medical Center Radiology Group, Orlando, Fla., USA
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20
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Masdeu JC, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L. Atraumatic isolated headache--when to image. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:487-93. [PMID: 11037460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- J C Masdeu
- St. Vincent's Hospital, New York, NY, USA
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21
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Johnson BA, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Ataxia. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:573-8. [PMID: 11037467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- B A Johnson
- Center for Diagnostic Imaging, St. Louis Park, Minn., USA
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22
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Anderson RE, Drayer BP, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Acute low back pain--radiculopathy. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:479-85. [PMID: 11037459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- R E Anderson
- Medical Center Radiology Group, Orlando, Fla., USA
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23
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Braffman B, Drayer BP, Anderson RE, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Dementia. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:525-33. [PMID: 11037463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- B Braffman
- Memorial Regional Hospital, University of Miami, Hollywood, Fla., USA
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24
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Hasso AN, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Orbits, vision, and visual loss. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:579-87. [PMID: 11037468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- A N Hasso
- University of California Irvine Medical Center, Orange, USA
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25
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Johnson BA, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Progressive neurological deficit. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:437-57. [PMID: 11037456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- B A Johnson
- Center for Diagnostic Imaging, St. Louis Park, Minn., USA
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26
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Davis PC, Drayer BP, Anderson RE, Braffman B, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L, Masdeu JC. Head trauma. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:507-24. [PMID: 11037462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- P C Davis
- Egleston Children's Hospital, Atlanta, Ga., USA
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27
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Masdeu JC, Drayer BP, Anderson RE, Braffman B, Davis PC, Deck MD, Hasso AN, Johnson BA, Masaryk T, Pomeranz SJ, Seidenwurm D, Tanenbaum L. Multiple sclerosis--when and how to image. American College of Radiology. ACR Appropriateness Criteria. Radiology 2000; 215 Suppl:547-62. [PMID: 11037465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- J C Masdeu
- St. Vincent's Hospital, New York, NY, USA
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28
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Hasso AN. How to review and retrieve information from the AJNR; or, how to read the AJNR and still have time to ski. AJNR Am J Neuroradiol 1997; 18:1323-4. [PMID: 9282863 PMCID: PMC8338040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- A N Hasso
- University of California, Irvine, Orange 92668-3298, USA
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29
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Perry JR, Hasso AN. Magnetic resonance imaging of cranial nerve VII. Top Magn Reson Imaging 1996; 8:155-63. [PMID: 8840470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Magnetic resonance imaging (MRI) is well suited for the evaluation of lesions of the seventh cranial (facial) nerve. The preferred MRI approach requires use of multiplanar thin sections of the full course of the nerve from the pons through to its terminal branches on the face. The use of paramagnetic contrast greatly increases the sensitivity of MRI and for the most part precludes the need to use computed tomography scans in conjunction with the MRI scans.
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Affiliation(s)
- J R Perry
- Department of Radiology, Loma Linda University School of Medicine, California, USA
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30
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Seynaeve P, Hasso AN, Thompson JR, Hinshaw DB. Basilar and distal vertebral artery occlusive disease: correlation of MR imaging and MR angiography. J Belge Radiol 1996; 79:61-7. [PMID: 8767834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The purpose of this study is to evaluate the correlation of brain lesions seen on magnetic resonance imaging with vascular occlusive disease of the basilar and distal vertebral arteries as documented on MR angiography. The clinical findings are also correlated with the findings on MR imaging and MR angiography. The clinical records of twenty-one patients with proven occlusive disease of the distal vertebral and/or basilar arteries were retrospectively reviewed. All the patients were imaged utilizing either the Siemens Magnetom 1.5 T SP 4000 and the Siemens 1.0 T Impact systems. Dual MR angiographic techniques were employed including two-dimensional (2D) and three-dimensional time-of-flight. The 2D sequences utilized fast low angle shot gradient echo sequences. The 3D sequences utilized fast image steady-state precession gradient echo sequences. Gadolinium contrast was utilized for increased angiographic detail in one patient. Magnetization transfer contrast was used in three patients. The individual partitions as well as the maximum intensity pixel projection images were evaluated in each case. The most extensive brain lesions were seen in the group of patients with severe basilar and/or combined vertebrobasilar disease. One-half of these patients showed non-specific scattered foci of T2 lengthening similar to the findings found in a group of patients with noncritical stenosis. MR imaging invariably demonstrated more lesions than were clinically suspected. Even though the brain lesions tended to be more extensive in patients with severe vascular disease, the amount of brain tissue damage was not an adequate parameter to document the degree of vascular narrowing. The degree of vascular narrowing was useful in therapy planning. Such data was obtained by the MR angiograms, but not by MR imaging. MR angiography is a useful complementary examination when lesions in the basilar and distal vertebral vascular territories are diagnosed on MR imaging. MR angiography can differentiate critical from noncritical stenosis and can thus play a key role in the therapeutic decision making process.
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Affiliation(s)
- P Seynaeve
- Loma Linda University Medical Center, Department of Radiology, CA, USA
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31
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Hasso AN. Clinical reviews: the denouement of investigations in medicine. J Magn Reson Imaging 1995; 5:249. [PMID: 7633099 DOI: 10.1002/jmri.1880050302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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32
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Hasso AN, Stringer WA, Brown KD. Cerebral ischemia and infarction. Neuroimaging Clin N Am 1994; 4:733-52. [PMID: 7858918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cerebral infarction is most commonly related to atherosclerotic disease in the carotid and vertebrobasilar circulations. TIAs are manifestations of this same disease process and may occur before a complete infarction. The transformation of pale to hemorrhagic infarction may result from reperfusion of an infarct or from migration of an embolus. CT is often the primary imaging study to exclude frank hemorrhage. The use of MR is increasing, in both the acute and the subacute phases of stroke. The combination of MR imaging and MR angiography is gradually replacing CT, particularly in patients with TIAs. In addition, the depiction of minute alterations in contrast and subtle mass effect is visualized with MR more often than with CT. The precise localization of brain stem and posterior fossa infarctions is improved by the ability of MR to view complex structures in two or more orthogonal planes. Vascular structures are readily identified both on the spin echo images and with MR angiography. Slow or obstructed flow in the venous channels may be recognized, which makes MR the ideal examination for the evaluation of cerebral ischemia and infarction.
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Affiliation(s)
- A N Hasso
- Loma Linda University School of Medicine, California
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33
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Hoang TA, Hasso AN. Intracranial vascular malformations. Neuroimaging Clin N Am 1994; 4:823-47. [PMID: 7858922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Magnetic resonance imaging is a useful process in the evaluation and follow-up examination of intracranial vascular malformations. Magnetic resonance imaging as related to the four subtypes of these malformations, arteriovenous malformations, venous angiomas, cavernous malformations, and capillary telangiectasis, is discussed.
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Affiliation(s)
- T A Hoang
- Jerry L. Pettis Memorial Veterans Hospital, Loma Linda, California
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34
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Hasso AN, Bell SA, Tadmor R. Intracranial vascular tumors. Neuroimaging Clin N Am 1994; 4:849-70. [PMID: 7858923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The study of intracranial vascular tumors is of significant importance because these tumors may stimulate vascular malformations, infarctions, or infections. This article describes vascular tumors and discusses their appearance on MR imaging studies. Choroid plexus neoplasms, primitive neuroectodermal tumors, hemangioblastoma and other disorders are discussed.
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Affiliation(s)
- A N Hasso
- Loma Linda University School of Medicine, California
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35
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Hasso AN. Imaging of pulsatile tinnitus: basic examination versus comprehensive examination package. AJNR Am J Neuroradiol 1994; 15:890-2. [PMID: 8059656 PMCID: PMC8332165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- A N Hasso
- Loma Linda University, CA 92354-2870
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36
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McLachlan SJ, Francisco JC, Pernicone JR, Hasso AN. Efficacy evaluation of gadoteridol for MR angiography of intracranial vascular lesions. J Magn Reson Imaging 1994; 4:405-11. [PMID: 8061440 DOI: 10.1002/jmri.1880040328] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A phase III multicenter study was conducted in 89 patients with known intracranial vascular lesions to evaluate an extracellular gadolinium contrast agent, gadoteridol, for intracranial magnetic resonance (MR) angiography. The pre- and postcontrast MR angiograms of 82 patients were evaluated by the unblinded investigators and by two blinded readers (A and B) for visualization of lesions; arterial and venous anatomy; extent, size, and number of lesions; and disease classification. The unblinded readers indicated that lesions were visualized better on postcontrast images in the following categories: venous anatomy, 87 (81%) of 107 lesions; arterial anatomy, 43 lesions (40%); and extent or size of lesions, 38 lesions (36%). In 29 (35%) of 82 patients, the unblinded readers determined that enhanced MR angiography provided more diagnostic information than unenhanced MR angiography. The blinded readers determined that enhanced MR angiography provided more information for visualization of vascular anatomy in more than 60% of cases. The additional information provided with gadoteridol would have changed the diagnosis in nine (8%) of 107 lesions seen by the unblinded readers, 11 (12%) of 90 lesions seen by reader A, and three (3%) of 93 lesions seen by reader B. The results confirm that the use of gadoteridol improves the visualization of intracranial vascular lesions with MR angiography. The authors conclude that development of new postprocessing algorithms will improve the utility of contrast-enhanced MR angiography.
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37
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Hasso AN, Lambert D. Magnetic resonance imaging of the paranasal sinuses and nasal cavities. Top Magn Reson Imaging 1994; 6:209-223. [PMID: 7803038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Magnetic resonance imaging has proven to be a useful tool for imaging the paranasal sinuses and nasal cavities. Of particular interest in this region is the ability to distinguish between lesions that are highly cellular with little free water (neoplasms) and lesions that have significant amounts of serous and mucinous secretions and thus contain predominantly free water (infections).
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Affiliation(s)
- A N Hasso
- Department of Radiology, Loma Linda University Medical Center, CA 92354-2870
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38
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Hasso AN, Nickmeyer CA. Magnetic resonance imaging of soft tissues of the neck. Top Magn Reson Imaging 1994; 6:254-274. [PMID: 7803041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Magnetic resonance imaging (MRI) has proven to be an ideal examination for evaluating a variety of soft tissue lesions in the extracranial head and neck. In this article we will describe the MRI characteristics of a variety of the soft tissue lesions found in the neck. Pathophysiology, clinical presentation, treatment, and prognosis are also discussed.
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Affiliation(s)
- A N Hasso
- Department of Radiology, Loma Linda University Medical Center, CA 92354-2870
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39
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Affiliation(s)
- A N Hasso
- Department of Neuroradiology, Loma Linda University Medical Center, California 92354
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40
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Stringer WA, Hasso AN, Thompson JR, Hinshaw DB, Jordan KG. Hyperventilation-induced cerebral ischemia in patients with acute brain lesions: demonstration by xenon-enhanced CT. AJNR Am J Neuroradiol 1993; 14:475-84. [PMID: 8456732 PMCID: PMC8332972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
PURPOSE To examine the possibility that hyperventilation, commonly used to prevent or treat increased intracranial pressure in patients with acute brain lesions, may induce significant cerebral ischemia. METHODS Local cerebral blood flow and vascular reactivity were measured before and after hyperventilation using xenon-enhanced CT in 12 patients with acute brain lesions. RESULTS Five patients showed "paradoxical" reactivity (increased cerebral blood flow during hyperventilation) within the lesions. In five patients, hyperventilation induced ischemia in apparently normal regions of brain. In three patients, areas of luxury perfusion became ischemic during hyperventilation, while in three patients, lesions with moderate ischemia became more ischemic. Most patients showed more than one type of reactivity. CONCLUSIONS These findings document hyperventilation-induced ischemia in acute brain lesions, and demonstrate that this phenomenon affects both injured and apparently intact areas of the brain. Further studies are required to determine the clinical significance of these pathophysiologic changes.
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Affiliation(s)
- W A Stringer
- Department of Radiology, Loma Linda University Medical Center, CA 92350
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41
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Affiliation(s)
- A N Hasso
- Department of Radiology, Loma Linda University School of Medicine, CA 92354
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42
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Tali ET, Yuh WT, Nguyen HD, Feng G, Koci TM, Jinkins JR, Robinson RA, Hasso AN. Cystic acoustic schwannomas: MR characteristics. AJNR Am J Neuroradiol 1993; 14:1241-7. [PMID: 8237710 PMCID: PMC8332755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
PURPOSE To evaluate the spectrum of MR characteristics of cystic acoustic schwannoma and to investigate its incidence. METHODS We retrospectively reviewed the MR findings and clinical records of 16 patients with cystic acoustic schwannomas. In addition, the MR examinations of 411 consecutive patients referred for clinical suspicion of acoustic schwannomas were reviewed retrospectively to assess the incidence of acoustic schwannomas with cystic lesions arising from the internal auditory canal. RESULTS Of the 16 acoustic schwannomas with MR evidence of intramural cysts, 11 tumors had single small cysts, and five had multiple intramural cysts of variable size. Intramural cysts in 11 of the 16 tumors exhibited higher signal intensity than that of cerebrospinal fluid; the remainder were isointense to cerebrospinal fluid on both T1- and T2-weighted images. All intramural cysts showed circumferential enhancement after contrast administration. Nine of the 16 cystic acoustic schwannomas also had MR evidence of extramural/arachnoid cysts. Six of the extramural/arachnoid cysts had epicenters away from the dural interface, and the other three cysts were broadly based against the dura. The incidence of cystic acoustic schwannomas was 11.3% and association with extramural/arachnoid cysts 7.5%. CONCLUSION Our series suggests that cystic changes in acoustic schwannomas and the association with extramural/arachnoid cysts are not as rare as previously reported by other diagnostic methods. The high signal intensity of intramural cysts is probably related to necrotic material, blood, or colloid-rich fluid. The difference in the MR characteristics of extramural/arachnoid cysts associated with acoustic schwannomas and those of typical arachnoid cysts not associated with neoplasia may be related to higher protein and/or colloid contents secreted by the tumor. Most extramural/arachnoid cysts had epicenters between the tumor and brain, suggesting that the most likely mechanism of formation is peritumoral adhesions. It creates a pseudo-duplication caused by the trapping of fluid between the leptomeninges and the mass, resulting in an acquired type of arachnoid cyst.
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Affiliation(s)
- E T Tali
- Department of Radiology, University of Iowa, College of Medicine, Iowa City 52242
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43
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Hasso AN. Adult extra-axial brain tumors. Top Magn Reson Imaging 1992; 4:41-63. [PMID: 1419033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Magnetic resonance imaging is the preferred cross-sectional imaging study for the evaluation of nearly all extra-axial brain tumors in adults. This article outlines the neoplasms by their pathology. The discussion covers the neoplasms originating from central neuroglial cells, meninges, and cranial nerves. In addition, developmental tumors and cysts and secondary extra-axial tumors are discussed.
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Affiliation(s)
- A N Hasso
- Loma Linda University School of Medicine, CA
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44
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Tosk JM, Holshouser BA, Aloia RC, Hinshaw DB, Hasso AN, MacMurray JP, Will AD, Bozzetti LP. Effects of the interaction between ferric iron and L-dopa melanin on T1 and T2 relaxation times determined by magnetic resonance imaging. Magn Reson Med 1992; 26:40-5. [PMID: 1625565 DOI: 10.1002/mrm.1910260105] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
T1 and T2 relaxation times of agar phantoms containing L-dopa melanin and Fe3+ were measured under MRI conditions. Fe3+ shortened T1 and T2 relaxation times. Melanin influenced relaxation times only in the presence of Fe3+; thus, contrast in MR images of the basal ganglia may depend upon levels of both paramagnetic iron and neuromelanin.
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Affiliation(s)
- J M Tosk
- Psychiatry Service, Jerry L. Pettis Veterans' Affairs Medical Center, Loma Linda, California 92357
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45
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Abstract
The kleeblattschädel deformity is a rare craniofacial condition typified by its trilobed, cloverleaf skull. The pathophysiology of this process is controversial. The morphologic, radiographic, and histologic abnormalities identified in the cranial base of an 18-gestational-week fetus with kleeblattschädel skull have not been described previously. Recently, the intrauterine diagnosis of kleeblattschädel was established by serial ultrasonography and, based on this evidence, the fetus was aborted. The fetus was studied extensively. Standard radiographs and high-resolution CT scans were obtained. Three-dimensional, reformatted contour surface images were constructed from the CT scan data. The cranial base was examined grossly, radiographically, and histologically. Histologic microanatomic study concentrated on structures of the mid-sagittal cranial base from the occiput to the mid maxilla. The distorted cranial architecture in kleeblattschädel deformity has, in the past, been attributed largely to the cranial base deformity which secondarily distorts the developing brain. Our study, however, suggests that the calvarium itself may be the primary focus of abnormal events leading to synostosis. The findings in this study seem to be inconsistent with earlier theories about the abnormal development of craniodysostoses.
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Affiliation(s)
- P D Witt
- Department of Surgery (Plastic and Reconstructive), Loma Linda University, California 92354
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46
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Hasso AN. Magnetic resonance angiography in the head and neck. West J Med 1992; 156:296-7. [PMID: 1595250 PMCID: PMC1003241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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47
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Hasso AN, Russell EJ. Tuesday morning grand ballroom E papers 225–232. Clinical imaging: Spine. J Magn Reson Imaging 1991. [DOI: 10.1002/jmri.1880010240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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48
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Hasso AN. Gadolinium in magnetic resonance imaging of the central nervous system. West J Med 1990; 152:63-64. [PMID: 18750691 PMCID: PMC1002259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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49
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Hasso AN. My experience as a patient with subarachnoid hemorrhage. AJNR Am J Neuroradiol 1990; 11:229-30. [PMID: 2107705 PMCID: PMC8334690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- A N Hasso
- Loma Linda University, Neuroradiology Section, CA 92354
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50
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Abstract
Choroid plexus papillomas are rare, constituting approximately 0.5% of all intracranial neoplasms. Four benign choroid plexus papillomas and one choroid plexus carcinoma were retrospectively reviewed in patients aged 4-20 months who had been examined with magnetic resonance (MR) imaging with a field strength of 0.5 T or 1.0 T and with computed tomography (CT) before and after the administration of contrast material. In general, the tumors were of intermediate signal intensity on T1-weighted images and of either intermediate or increased signal intensity (T2 lengthening) with T2 weighting. All demonstrated variable areas of internal signal void interpreted as signifying regional blood flow, calcification, or old hemorrhage. CT findings included relatively uniform contrast enhancement. Microscopic pathologic changes of the benign lesions mimicked the appearance of normal choroid plexus and confirmed the highly vascular nature of these tumors. MR imaging, with its high-resolution multiplanar techniques, offers direct visualization of these lesions in relation to normal anatomy and better discrimination and confirmation of their intraventricular location, facilitating surgery and postoperative follow-up.
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Affiliation(s)
- T L Coates
- Department of Radiation Sciences, Loma Linda University Medical Center, CA 92354
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