Limits...
Intracranial Lesions with Low Signal Intensity on T2-weighted MR Images - Review of Pathologies.

Zimny A, Neska-Matuszewska M, Bladowska J, Sąsiadek MJ - Pol J Radiol (2015)

Bottom Line: In this article we presented intracranial pathological substances and lesions with low signal intensity on T2-weighted images.Eight groups of substances were discussed i.e. 1.Gadolinium-based contrast materials, 2. hemoglobin degradation products 3. melanin, 4. mucous- or protein-containing lesions, 5. highly cellular lesions, 6. lesions containing mineral substances such as: calcium, copper and iron, 7. turbulent and rapid blood or CSF flow 8. air-containing spaces.

View Article: PubMed Central - PubMed

Affiliation: Department of General and Interventional Radiology and Neuroradiology, Wrocław Medical University, Wrocław, Poland.

ABSTRACT
In this article we presented intracranial pathological substances and lesions with low signal intensity on T2-weighted images. Eight groups of substances were discussed i.e. 1. Gadolinium-based contrast materials, 2. hemoglobin degradation products 3. melanin, 4. mucous- or protein-containing lesions, 5. highly cellular lesions, 6. lesions containing mineral substances such as: calcium, copper and iron, 7. turbulent and rapid blood or CSF flow 8. air-containing spaces. Appropriate interpretation of signal intensity as well as analysis of lesion location and clinical symptoms enable a correct choice of a further diagnostic algorithm or, in many cases, final diagnosis based exclusively on an MRI examination.

No MeSH data available.


Related in: MedlinePlus

High-pressure hydrocephalus due to a tumor located at the cranio-cervical junction. Sagittal T2-weighted image shows enlarged ventricles and a hypointense jet through an aqueduct indicating very fast flow of the CSF.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4307690&req=5

f17-poljradiol-80-40: High-pressure hydrocephalus due to a tumor located at the cranio-cervical junction. Sagittal T2-weighted image shows enlarged ventricles and a hypointense jet through an aqueduct indicating very fast flow of the CSF.

Mentions: Liquids with turbulent flow produce rapid loss of phase coherence and absence of signal reflected as strong hypointense T2 signal. This effect is called a flow void phenomenon and occurs either in physiological vessels containing fast-flowing blood or within structures containing cerebrospinal fluid (CSF) in normal subjects. The flow void phenomenon enables to visualize normal vessels on T2-weighted images as well as their pathologies such as aneurysms or other less common vascular malformations, which are well seen even before the contrast injection (Figure 16) [25]. CSF with a local very rapid and turbulent flow may be seen as a dark jet of fluid. This phenomenon is usually observed within the aqueduct and the fourth ventricle in the high-pressure or normal-pressure hydrocephalus (Figure 17) or due to aqueductal stenosis, but it can also be noticed across the ventriculostomy or fistulas [26,27].


Intracranial Lesions with Low Signal Intensity on T2-weighted MR Images - Review of Pathologies.

Zimny A, Neska-Matuszewska M, Bladowska J, Sąsiadek MJ - Pol J Radiol (2015)

High-pressure hydrocephalus due to a tumor located at the cranio-cervical junction. Sagittal T2-weighted image shows enlarged ventricles and a hypointense jet through an aqueduct indicating very fast flow of the CSF.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4307690&req=5

f17-poljradiol-80-40: High-pressure hydrocephalus due to a tumor located at the cranio-cervical junction. Sagittal T2-weighted image shows enlarged ventricles and a hypointense jet through an aqueduct indicating very fast flow of the CSF.
Mentions: Liquids with turbulent flow produce rapid loss of phase coherence and absence of signal reflected as strong hypointense T2 signal. This effect is called a flow void phenomenon and occurs either in physiological vessels containing fast-flowing blood or within structures containing cerebrospinal fluid (CSF) in normal subjects. The flow void phenomenon enables to visualize normal vessels on T2-weighted images as well as their pathologies such as aneurysms or other less common vascular malformations, which are well seen even before the contrast injection (Figure 16) [25]. CSF with a local very rapid and turbulent flow may be seen as a dark jet of fluid. This phenomenon is usually observed within the aqueduct and the fourth ventricle in the high-pressure or normal-pressure hydrocephalus (Figure 17) or due to aqueductal stenosis, but it can also be noticed across the ventriculostomy or fistulas [26,27].

Bottom Line: In this article we presented intracranial pathological substances and lesions with low signal intensity on T2-weighted images.Eight groups of substances were discussed i.e. 1.Gadolinium-based contrast materials, 2. hemoglobin degradation products 3. melanin, 4. mucous- or protein-containing lesions, 5. highly cellular lesions, 6. lesions containing mineral substances such as: calcium, copper and iron, 7. turbulent and rapid blood or CSF flow 8. air-containing spaces.

View Article: PubMed Central - PubMed

Affiliation: Department of General and Interventional Radiology and Neuroradiology, Wrocław Medical University, Wrocław, Poland.

ABSTRACT
In this article we presented intracranial pathological substances and lesions with low signal intensity on T2-weighted images. Eight groups of substances were discussed i.e. 1. Gadolinium-based contrast materials, 2. hemoglobin degradation products 3. melanin, 4. mucous- or protein-containing lesions, 5. highly cellular lesions, 6. lesions containing mineral substances such as: calcium, copper and iron, 7. turbulent and rapid blood or CSF flow 8. air-containing spaces. Appropriate interpretation of signal intensity as well as analysis of lesion location and clinical symptoms enable a correct choice of a further diagnostic algorithm or, in many cases, final diagnosis based exclusively on an MRI examination.

No MeSH data available.


Related in: MedlinePlus