Nuclear magnetic resonance imaging of posterior fossa tumors

Randell, C P; Collins, A J; Ir, Young; Haywood, Richard M.; Thomas, D. J.; McDonnell, MJ; Orr, J. S.; Gm, Bydder; Steiner, R. E.

doi:10.2214/ajr.141.3.489

Cited by 68 publications

(9 citation statements)

References 24 publications

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“…CT has been criticized for providing images of well demarcated lesions, when MR im- ages of the same tumor demonstrate diffuse invasiveness (5,18). Most of these studies report their conclusions on the basis of pure radiographic criteria, or on occasional surgical biopsy (5,15,18), and few studies provide anatomic documentation which is in sufficient detail for valid comparisons (1,21). However, T2 weighted images have been reported by some investigators to be less reliable in differentiating edema from tumor mass (1,15) while T1 weighted images have been shown to be less sensitive to edema (22).…”

Section: Discussionmentioning

confidence: 99%

Solitary brainstem metastasis: Comparisons of X-ray computed tomography and magnetic resonance imaging to pathology

Simpson¹,

Sirbasku

Baskin³

1987

J Neuro-Oncol

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A case of solitary brainstem metastasis from a bronchogenic adenocarcinoma is presented. X-ray computed tomography, magnetic resonance imaging, and specimens obtained at autopsy are compared. T2 weighted magnetic resonance images provided evidence for the diagnosis of a diffusely infiltrating process, whereas T1 weighted images demonstrated a clearly defined, well demarcated tumor. Contrast enhanced computed tomography supported evidence obtained from the T1 weighted image. At autopsy, the tumor was a well circumscribed pontine metastasis with surrounding edema. The importance of distinguishing between T1 and T2 weighted images is crucial for establishing a correct diagnosis and for instituting proper therapy. In contrast to some reports, we found that the T2 weighted image was misleading in regard to defining the extent of tumor. We conclude that both images must be considered together to provide an accurate diagnostic estimate.

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Section: Discussionmentioning

confidence: 99%

Solitary brainstem metastasis: Comparisons of X-ray computed tomography and magnetic resonance imaging to pathology

Simpson¹,

Sirbasku

Baskin³

1987

J Neuro-Oncol

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“…Because of severe bone artefacts the lesion was almost missed in the CT. In the paramedian sagittal sections of M R which were performed with short and long imaging parameters of SE as well as with IR, the lesion developed significant differ- ences in contrast compared to its surrounding tissue because of prolonged T I and T2 values [5,13] making its diagnosis easy (Figs. 6a, b).…”

Section: Pathology Of the Sella And Perisellar Regionmentioning

confidence: 99%

Nuclear magnetic resonance imaging of the region of the sella turcica

Huk

Fahlbusch

1985

Neurosurg. Rev.

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Nuclear magnetic resonance (NMR) imaging is a versatile technique which has proved more sensitive in the detection of perisellar lesions than CT. A multiplanar facility, the demonstration of blood flow, and the lack of bone artefacts are its main advantages in this respect. Limitations are seen in its inability to identify small calcifications and to distinguish clearly perifocal oedema and tumour especially in malignant lesions. Relatively thick slices of 5-10 mm make the detection of microadenomas very difficult, mainly because of partial volume effects. T1 and T2 values alone are not sufficient to provide specific diagnosis. No reliable criteria have been determined yet, which would indicate the quality of pathological involvement of peritumorous structures by tumours of the sella region. At present NMR still plays a more complementary role to CT in the evaluation of this complex anatomical area. We are confident that with future technical refinements NMR will be able to replace ionizing radiation for the diagnostic imaging of the sella.

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“…However, the use of metrizamide may be necessary in evaluating lower portions of the posterior fossa, as this is still the most difficult area to delineate. MRI may allow more precise definition of this area than CT. [4][5][6] Definitions of normality are needed when attempting to diagnose subtle abnormalities on CT scans (particularly when dealing with certain features of brain stem neoplasms). Biddle er al.'…”

Section: Posterior Fossa Neoplasmsmentioning

confidence: 99%

Computed tomography in the diagnosis of intracranial neoplasms in children

Segall

Batnitzky

Zee

et al. 1985

Cancer

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The authors discuss their original observations using computed tomography (CT) in the diagnosis of posterior fossa neoplasms in children. The subject of CT diagnosis of childhood supratentorial tumors is also reviewed. However, despite the documented value of CT, the authors believe that magnetic resonance imaging (MRI) will eventually offer certain advantages that will make MRI the primary imaging modality for intracranial neoplasms in children.

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Nuclear magnetic resonance imaging of posterior fossa tumors

Cited by 68 publications

References 24 publications

Solitary brainstem metastasis: Comparisons of X-ray computed tomography and magnetic resonance imaging to pathology

Solitary brainstem metastasis: Comparisons of X-ray computed tomography and magnetic resonance imaging to pathology

Nuclear magnetic resonance imaging of the region of the sella turcica

Computed tomography in the diagnosis of intracranial neoplasms in children

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