Autoimmune encephalitis is a relatively novel nosological entity characterized by an immune-mediated damage of the central nervous system. While originally described as a paraneoplastic inflammatory phenomenon affecting limbic structures, numerous instances of non-paraneoplastic pathogenesis, as well as extra-...
The high-signal of the PZ is caused by cystic degeneration with high fluid content and is usually surrounded by a thin hypointense rim that represents the pseudocapsule. This rim is an important landmark for tumor staging [8]. The TZ usually has a heterogeneous mixed signal due to the ...
Radiographically, cSS can be detected on SWI or T2*-weighted image as a hypointense signal in the cerebral cortex, within the subarachnoid space, or both, showing a track-like appearance, or gyriform pattern [10] (Fig.5). On both 3-dimensional (3D) fluid-attenuated inversion recovery (F...
The relation of the hypointense vein (black arrow) with the demyelinating plaque is better depicted with the FLAIR* image, which is calculated as the prod- uct of the coregistered T2-FLAIR and SWI images. Lesion probability map obtained with brain MRI in a group of patients with multiple ...
(A) In the first patient, no lesion is seen during the arterial phase at Gd-EOB-DTPA MR imaging because of lack of hypervascularity in small HCC. (B) Two small HCCs (arrow) are seen as hypointense nodules in the right hepatic lobe during the hepatobiliary phase. (C) In another ...
On magnetic resonance imaging, aspergilloma is hypo intense in both sequences T1 and T2 because of the lack of water and the high content of proteins of the fungus ball (Gustafson and Bansberg, 2000). The cause of aspergillomas remains obscure, and the role of dental filling material is ...
MRI shows a well-defined, smooth, homogenous lesion, hypointense on T1 and hyperintense on T2 weighted images (Figure3). Some malignant lesions may show a similar hyperintensity on T2, to differentiate HH from solid neoplastic liver lesions the echo time is increased which causes signal from mal...
MRI was screened by two senior musculoskeletal radiologists in consensus for joint-space related MRI findings and grouped into three categories, Type A: hyperintense in STIR and hypointense in T1 (inflammation inside erosion), Type B: hyperintense in both sequences and Type C: hypointense in ...
Figure 4. A 17-year-old patient, incidental discovery in CT-scan of a heterogeneous retroperitoneal lesion (A and B, arrow). In MRI, the lesion is the site of central cystic modifications in T1-weighted hyposignal (C) and T2-weighted hypersignal (D). The methoxylated derivatives in urine...
Jaffee initially described OO as a lesion consisting of two components: the “core or nidus-like focus (the osteoid-osteoma proper)” and the peripheral bone thickening [36]. However, now the term “nidus” is typically used to describe the entire lesion, including the mineralized center and ...