scholarly journals Diffusion‐ and perfusion‐weighted imaging characteristics of an intracranial abscess in a cat

2021 ◽  
Author(s):  
A. Nagendran ◽  
J.F. McConnell
Keyword(s):  
Intracranial Abscess ◽  
Perfusion Weighted Imaging ◽  
Imaging Characteristics

scholarly journals The clinical heterogeneity of entirely nonenhancing CNS lymphoma: a case series

CNS Oncology ◽  
2020 ◽  
pp. CNS67
Author(s):  
Stephen G Bowden ◽  
Daniel N Munger ◽  
Jaclyn Thiessen ◽  
S Cody Schoettler Woll ◽  
Seunggu J Han ◽  
...  
Keyword(s):  
Case Series ◽  
Initial Presentation ◽  
Cns Lymphoma ◽  
Clinical Heterogeneity ◽  
Delay In Diagnosis ◽  
Perfusion Weighted Imaging ◽  
Imaging Characteristics

CNS lymphoma often presents with atypical imaging characteristics leading to delay in diagnosis and initiation of treatment. Among the most rarely reported of these is entirely nonenhancing CNS lymphoma, which is estimated at an incidence of about 1%. Here, we present three cases of nonenhancing CNS lymphoma in immune competent patients at both initial presentation and recurrence and in primary as well as secondary CNS lymphoma. Diffusion- and perfusion-weighted imaging was found helpful in diagnosis in some cases.

The High Resolution Scanning Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 316-317
Author(s):  
A. V. Crewe
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
High Vacuum ◽  
Scanning Transmission Electron Microscope ◽  
Ultra High Vacuum ◽  
Resolving Power ◽  
Imaging Characteristics ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
The Moment

The high resolution STEM is now a fact of life. I think that we have, in the last few years, demonstrated that this instrument is capable of the same resolving power as a CEM but is sufficiently different in its imaging characteristics to offer some real advantages.It seems possible to prove in a quite general way that only a field emission source can give adequate intensity for the highest resolution^ and at the moment this means operating at ultra high vacuum levels. Our experience, however, is that neither the source nor the vacuum are difficult to manage and indeed are simpler than many other systems and substantially trouble-free.

NARROW BAND IMAGING CHARACTERISTICS OF POLYPOID GASTRIC LESIONS: A SINGLE CENTER PROSPECTIVE STUDY

2019 ◽  
Author(s):  
G Esposito ◽  
S Angeletti ◽  
M Cazzato ◽  
G Galli ◽  
L Conti ◽  
...  
Keyword(s):  
Prospective Study ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Gastric Lesions ◽  
Single Center ◽  
Imaging Characteristics

Clinical Manifestations and Radiological Characteristics on Rosai-Dorfman Disease: A Retrospective Observational Study

2020 ◽  
Vol 5 (5) ◽  
Keyword(s):  
Blood Vessels ◽  
Abdominal Cavity ◽  
Clinical Manifestations ◽  
Ct Images ◽  
High Signal ◽  
Radiological Features ◽  
Imaging Characteristics ◽  
Rosai Dorfman Disease ◽  
Heterogeneous Enhancement ◽  
The Masses

Background and Objective: Rosai-Dorfman disease (RDD) are usually misdiagnosed because of rarity and nonspecific clinical and radiological features. The aim of our study is to explore the clinical and imaging characteristics of RDD to improve diagnostic accuracy. Methods: Clinical and imaging data in 10 patients with RDD were retrospectively analyzed. 7 patients were underwent CT scanning and 3 patients were underwent MR examination. Results: 8 (8/10) patients presented with painless enlarged lymph nodes (LNs) or mass. 3 cases were involved with LNs, 5 cases were involved with extra-nodal tissues, and the remaining 2 cases were involved with LNs and extra-nodal tissue simultaneously. In enhanced CT images, enlarged LNs displayed mild or moderate enhancement, and 2 cases showed heterogeneous ring-enhancement. MR features of 3 patients with extra-nodal RDD, 2 cases showed a mass located in the subcutaneous and anterior abdominal wall respectively, and 1 case showed an intracranial mass. Besides, all lesions showed high signal foci on DWI images, and were characterized by marked heterogeneous enhancement with blurred edge. The dural/fascia tail sign and dilated blood vessels could be seen around all the lesions on enhanced MRI. Radiological features of 2 cases with LN and extranodal tissue involved, one case presented with the swelling and thickening of pharyngeal lymphoid ring and nasopharynx, meanwhile with enlarged LNs in bilateral submandibular area, neck and abdominal cavity, and also companied with osteolytic lesion in right proximal humerus. All these LNs displayed mild and moderate enhancement on CT images. Another case showed enlarged LNs in bilateral neck accompanied with soft tissue mass in the sinuses. Conclusions: RDD occurred commonly in young and middle-aged men and presented with painless enlarged LNs or mass.RDD had a huge diversity of imaging findings, which varied with different location. The radiological features, such as small patches of high signal foci in the masses on DWI images, heterogeneous enhancement and blood vessels around the masses, are helpful in diagnosis of extranodal RDD.

Condrosarcom laringian - prezentare de caz

ORL ro ◽  
2016 ◽  
Vol 4 (1) ◽  
pp. 32-35
Author(s):  
Bogdan Mocanu ◽  
Aida Petca ◽  
Daniela Safta ◽  
Cornelia Niţipir ◽  
Liliana Mirea ◽  
...  
Keyword(s):  
Gold Standard ◽  
Total Laryngectomy ◽  
Cricoid Cartilage ◽  
Good Prognosis ◽  
Rare Cancers ◽  
Imaging Characteristics ◽  
Laryngeal Tumors ◽  
Grade Ii

Chondrosarcomas of the larynx are rare cancers, representing less than 1% of all laryngeal tumors. The most often involved site is the cricoid cartilage. They have generally good prognosis, and low metastatic tendency. Surgery is the treatment of choice, partial in small limited tumors or total laryngectomy if tumor extends beyond the half of the cricoid and/or is poor differentiated. Although there are some pathognomonic imaging characteristics for chondrosarcomas, the histology remains the gold standard for diagnostic. The authors present a case of large, medium differentiated chondrosarcoma (grade II), surgically treated by total laryngectomy.   

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