CALCIFYING PSEUDONEOPLASM OF THE INFERIOR COLLICULUS: AN UNUSUAL LOCATION FOR A RARE TUMOR: CASE REPORT

Neurosurgery ◽  
2009 ◽  
Vol 65 (5) ◽  
pp. E1005-E1006 ◽  
Author(s):  
Guilherme Ramina Montibeller ◽  
Alexandru-Constantin Stan ◽  
Joachim Kurt Krauss ◽  
Makoto Nakamura
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Inferior Colliculus ◽  
Vascular Lesions ◽  
Surgical Removal ◽  
Resonance Imaging ◽  
First Case ◽  
The Central Nervous System ◽  
Quadrigeminal Plate ◽  
The Right

Abstract OBJECTIVE Quadrigeminal plate lesions are rare and usually present with a silent clinical course. Tumors, vascular lesions, inflammatory and infectious processes have been described in this region. Calcifying pseudoneoplasms, also reported as fibro-osseous lesions, cerebral calculi, and brain stones, are unusual lesions in the central nervous system. They can be revealed by cranial radiography, computed tomography, and magnetic resonance imaging as calcified masses and should be differentiated from neoplastic, inflammatory, and vascular lesions. To the best of our knowledge, the occurrence of a calcifying pseudoneoplasm located at the quadrigeminal plate has not yet been reported. CLINICAL PRESENTATION A 67-year-old woman with a 6-month history of several daily attacks of dizziness presented to our service. Magnetic resonance imaging studies revealed a tumor in the right inferior colliculus. This lesion was isointense on T1-weighted imaging, hypointense on T2-weighted imaging, and homogeneously enhanced with contrast. INTERVENTION The lesion at the quadrigeminal plate was completely removed, and the patient was successfully treated without any new neurological deficit. At the time of follow-up, all preoperative symptoms had resolved. CONCLUSION We report the first case of a calcifying pseudoneoplasm of the inferior colliculus. Complete surgical removal of this type of tumor is feasible. We propose surgical treatment in this location when this tumor becomes symptomatic.

scholarly journals A case of pararenal angiomyolipoma arising from an existing exophytic angiomyolipoma

2013 ◽  
Vol 4 (3) ◽  
pp. 79 ◽  
Author(s):  
Michael Lipsky ◽  
Ingride Richardson ◽  
Bassir Tareen
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Healthy Woman ◽  
Frozen Sections ◽  
Resonance Imaging ◽  
First Case ◽  
The Right

A 52-year-old healthy woman with a congenital solitary right kidneypresented with an incidentally found pararenal mass. Computedtomography and magnetic resonance imaging revealed an exophyticmass in the right kidney consistent with an angiomyolipoma and anadditional enhancing pararenal mass that contained fatty elements.Differential diagnosis of the mass included liposarcoma and angiomyolipoma.Upon exploration, the exophytic angiomyolipoma wasfound to be contiguous with the pararenal mass via an isthmus offatty tissue. Frozen sections were taken from both masses which confirmedthat both were angiomyolipoma. This is the first case reportedin the literature wherein an angiomyolipoma extended extrarenallyand formed a significantly larger pararenal mass.

Reversible hyposmia caused by intracranial tumour

1999 ◽  
Vol 113 (8) ◽  
pp. 750-753 ◽  
Author(s):  
Tadashi Ishimaru ◽  
Takaki Miwa ◽  
Motohiro Nomura ◽  
Masayuki Iwato ◽  
Mrrusuru Furukawa
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Frontal Lobe ◽  
Intracranial Tumour ◽  
Resonance Imaging ◽  
First Case ◽  
Simple Compression ◽  
Magnetic Resonance Imaging Mri ◽  
The Right ◽  
Olfactory Disturbance

AbstractTwo patients with hyposmia caused by an intracranial tumour recovered olfactory functions after craniotomy. The first case was a 68-year-old male with a tumour metastasized from the lung to the right frontal lobe. The second case was a 75-year-old male with meningioma of the right frontal lobe. Results of T & T olfactometry and venous olfaction tests also indicated suspected central hyposmia. Magnetic resonance imaging (MRI) indicated compression of the frontal lobe by intracranial tumour. Pressure on the olfactory centre located in the frontal lobe produced hyposmia. Decompression of the frontal lobe by craniotomy improved the sense of smell. Therefore, some cases of olfactory disturbance caused by intracranial tumour may be reversible if they are the result of simple compression of the olfactory centre.

Lateralized Tinnitus Studied With Functional Magnetic Resonance Imaging: Abnormal Inferior Colliculus Activation

2000 ◽  
Vol 83 (2) ◽  
pp. 1058-1072 ◽  
Author(s):  
J. R. Melcher ◽  
I. S. Sigalovsky ◽  
J. J. Guinan ◽  
R. A. Levine
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Inferior Colliculus ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Sound Stimulation ◽  
Percent Signal Change ◽  
Signal Change ◽  
The Right

Tinnitus, the perception of sound in the absence of external stimuli, is a common and often disturbing symptom that is not understood physiologically. This paper presents an approach for using functional magnetic resonance imaging (fMRI) to investigate the physiology of tinnitus and demonstrates that the approach is effective in revealing tinnitus-related abnormalities in brain function. Our approach as applied here included 1) using a masking noise stimulus to change tinnitus loudness and examining the inferior colliculus (IC) for corresponding changes in activity, 2) separately considering subpopulations with particular tinnitus characteristics, in this case tinnitus lateralized to one ear, 3) controlling for intersubject differences in hearing loss by considering only subjects with normal or near-normal audiograms, and 4) tailoring the experimental design to the characteristics of the tinnitus subpopulation under study. For lateralized tinnitus subjects, we hypothesized that sound-evoked activation would be abnormally asymmetric because of the asymmetry of the tinnitus percept. This was tested using two reference groups for comparison: nontinnitus subjects and nonlateralized tinnitus subjects. Binaural noise produced abnormally asymmetric IC activation in every lateralized tinnitus subject ( n = 4). In reference subjects ( n = 9), activation (i.e., percent change in image signal) in the right versus left IC did not differ significantly. Compared with reference subjects, lateralized tinnitus subjects showed abnormally low percent signal change in the IC contralateral, but not ipsilateral, to the tinnitus percept. Consequently, activation asymmetry (i.e., the ratio of percent signal change in the IC ipsilateral versus contralateral to the tinnitus percept) was significantly greater in lateralized tinnitus subjects as compared with reference subjects. Monaural noise also produced abnormally asymmetric IC activation in lateralized tinnitus subjects. Two possible models are presented to explain why IC activation was abnormally low contralateral to the tinnitus percept in lateralized tinnitus subjects. Both assume that the percept is associated with abnormally high (“tinnitus-related”) neural activity in the contralateral IC. Additionally, they assume that either 1) additional activity evoked by sound was limited by saturation or 2) sound stimulation reduced the level of tinnitus-related activity as it reduced the loudness of (i.e., masked) the tinnitus percept. In summary, this work demonstrates that fMRI can provide objective measures of lateralized tinnitus and tinnitus-related activation can be interpreted at a neural level.

scholarly journals Alteration within the Hippocampal Volume in Patients with LHON Disease—7 Tesla MRI Study

2020 ◽  
Vol 10 (1) ◽  
pp. 14
Author(s):  
Cezary Grochowski ◽  
Kamil Jonak ◽  
Marcin Maciejewski ◽  
Andrzej Stępniewski ◽  
Mansur Rahnama-Hezavah
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Molecular Layer ◽  
Three Dimensional ◽  
Hippocampal Volume ◽  
7 Tesla ◽  
Diagnostic Process ◽  
Resonance Imaging ◽  
The Right

Purpose: The aim of this study was to assess the volumetry of the hippocampus in the Leber’s hereditary optic neuropathy (LHON) of blind patients. Methods: A total of 25 patients with LHON were randomly included into the study from the national health database. A total of 15 patients were selected according to the inclusion criteria. The submillimeter segmentation of the hippocampus was based on three-dimensional spoiled gradient recalled acquisition in steady state (3D-SPGR) BRAVO 7T magnetic resonance imaging (MRI) protocol. Results: Statistical analysis revealed that compared to healthy controls (HC), LHON subjects had multiple significant differences only in the right hippocampus, including a significantly higher volume of hippocampal tail (p = 0.009), subiculum body (p = 0.018), CA1 body (p = 0.002), hippocampal fissure (p = 0.046), molecular layer hippocampus (HP) body (p = 0.014), CA3 body (p = 0.006), Granule Cell (GC) and Molecular Layer (ML) of the Dentate Gyrus (DG)–GC ML DG body (p = 0.003), CA4 body (p = 0.001), whole hippocampal body (p = 0.018), and the whole hippocampus volume (p = 0.023). Discussion: The ultra-high-field magnetic resonance imaging allowed hippocampus quality visualization and analysis, serving as a powerful in vivo diagnostic tool in the diagnostic process and LHON disease course assessment. The study confirmed previous reports regarding volumetry of hippocampus in blind individuals.

Anomalous origin of the right pulmonary artery from the ascending aorta: Diagnosis by magnetic resonance imaging

1995 ◽  
Vol 18 (2) ◽  
pp. 118-121 ◽  
Author(s):  
Tae Kyoung Kim ◽  
Yeon Hyoen Choe ◽  
Hak Soo Kim ◽  
Jae Kon Ko ◽  
Young Tak Lee ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Pulmonary Artery ◽  
Ascending Aorta ◽  
Anomalous Origin ◽  
Resonance Imaging ◽  
Right Pulmonary Artery ◽  
The Right

Study of the right ventricle using magnetic resonance imaging

2012 ◽  
Vol 54 (3) ◽  
pp. 231-245 ◽  
Author(s):  
A. Capelastegui Alber ◽  
E. Astigarraga Aguirre ◽  
M.A. de Paz ◽  
J.A. Larena Iturbe ◽  
T. Salinas Yeregui
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Right Ventricle ◽  
Resonance Imaging ◽  
The Right

scholarly journals Magnetic resonance imaging for smoking abstinence: symptoms, mechanisms, and interventions

2021 ◽  
Vol 7 (2) ◽  
pp. 75-96
Author(s):  
Yanzhi Bi ◽  
Li Hu
Keyword(s):  
Magnetic Resonance Imaging ◽  
Smoking Cessation ◽  
Magnetic Resonance ◽  
Neural Substrates ◽  
Adverse Outcomes ◽  
Smoking Abstinence ◽  
Resonance Imaging ◽  
Functional Changes ◽  
Quit Attempts ◽  
The Central Nervous System

Tobacco smoking is the leading preventable cause of morbidity and mortality worldwide. Although a number of smokers are aware of the adverse outcomes of smoking and express a strong desire to stop smoking, most smoking quit attempts end in relapse within the first few days of abstinence, primarily resulting from the aversive aspects of the nicotine withdrawal syndrome. Therefore, studying the neural mechanisms of smoking abstinence, identifying smokers with heightened relapse vulnerability prior to quit attempts, and developing effective smoking cessation treatments appear to be promising strategies for improving the success of quit attempts. In recent years, with the development of magnetic resonance imaging, the neural substrates of smoking abstinence have become extensively studied. In this review, we first introduce the psychophysiological changes induced by smoking abstinence, including affective, cognitive, and somatic signs. We then provide an overview of the magnetic resonance imaging-based evidence regarding abstinence-related functional changes accompanied by these psychophysiological changes. We conclude with a discussion of the neural markers that could predict relapse during quit attempts and a summary of the psychophysiological interventions that are currently often used to help with smoking cessation. This review extends our understanding of the role of the central nervous system in smoking abstinence.

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