Examples of using Diffusion restriction in English and their translations into Portuguese
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The lower portion of the lesion presented diffusion restriction.
Note diffusion restriction in cholesteatoma at right arrow.
B: Axial diffusion-weighted image showing diffusion restriction.
Note diffusion restriction in cholesteatoma at right arrow head.
In the present case, areas of diffusion restriction were not observed.
Note diffusion restriction in residual cholesteatoma at left arrow.
C: Axial diffusion-weighted MRI sequence showing no diffusion restriction.
Note diffusion restriction in congenital cholesteatoma at right arrow.
Contrarily to arachnoid cysts, epidermoid tumors typically present diffusion restriction.
No diffusion restriction is observed in the inflammatory granulomatous tissue arrow.
C: Axial image,apparent diffusion coefficient mapping corroborating the absence of areas of diffusion restriction.
Presence of a focus of diffusion restriction in a small(3 mm) cholesteatoma at left arrow.
In Case 2, the nodules showed heterogeneous signal intensity on T1- and T2-weighted images, without diffusion restriction.
It is worthwhile to note that diffusion restriction is minimal or even absent in lymphomatosis cerebri, a rare presentation of CNS lymphoma.
Note the presence of artifact on the interface with the floor of the middle cranial fossa,hindering the investigation of diffusion restriction in the ears arrow.
The diffusion restrictions of the reactants caused by the micropores limit the use of zeolites for processing heavy molecules.
B: Diffusion-weighted echo planar axial MRI sequence showing water molecules diffusion restriction throughout the entire pancreatic parenchyma.
There is no diffusion restriction at left, due to the method limitation to demonstrate the residual matrix in auto-evacuated cholesteatoma arrow.
Usually, isosignal is observed on T1-weighted sequences, and iso- or hyposignal on T2-weighted sequences,besides typical diffusion restriction and intense enhancement following contrast agent injection.
D: Diffusion restriction in the entire pancreas, with an ADC value of 0.839× 10-3 mm2/s(solid arrow), as well as in the renal nodules dashed arrows.
Benign lesions generally do not present any sign of water molecules diffusion restriction and, consequently, present low signal intensity on this sequence and ADC levels> 1.0× 10 mm/s Figure 2.
Diffusion restriction may also be absent in lymphomas if the imaging study is performed in patients under steroid therapy personal experience.
At early stages of the condition, diffusion MRI does not demonstrate any abnormalities, butinappropriate management may result in irreversible damages presented as diffusion restriction corresponding to cytotoxic edema.
However, diffusion restriction can be observed in GBMs, so it might be difficult to differentiate such tumor from lymphomas utilizing only diffusion-weighted imaging.
Spontaneously evacuated cholesteatoma is also a possible cause o false-negative result, once the contents of desquamated anddegraded keratin responsible for the diffusion restriction shall not be present in cases of automastoidectomy.
Diffusion restriction is observed, probably in association with the cytotoxic edema secondary to spongiform degeneration and to accumulation of abnormal cytoplasmic vacuoles.
In such an example, non-echo-planar HASTE imaging demonstrated diffusion restriction at right and absence of restriction at left, despite the matrix permanence after auto evacuation of the keratin content.
As in pelvic endometriosis, pleural nodules of thoracic endometriosis might show different signal intensity on T1- and T2-weighted images,as well as variable diffusion restriction, depending on the age of the lesion.
Follow-up MRI 48 hours later showed a diffusion restriction focus in the left hippocampus, consistent with the clinical hypothesis of transitory global amnesia Figures 1 and 2.
The finding of an expansile supratentorial solid lesion hypointense on T2-weighted images, with no signs of necrosis, lipids peak in the solid component,low perfusion and diffusion restriction, favors the possibility of such diagnosis.