Imaging features of lipoma arborescens

Background Lipoma arborescens is characterized by the villous proliferation of the synovium and diffuse hyperplasia of fatty tissue in the subsynovial layer, almost always with a periarticular lesion. According to past articles, fewer cases have depicted the imaging features of lipoma arborescens. Purpose To evaluate the computed tomography (CT) and magnetic resonance imaging (MRI) features of lipoma arborescens. Material and Methods The imaging features of 15 patients with pathologically proven lipoma arborescens were retrospectively analyzed including lesion number, shape, location, size, margins, attenuation on CT, and signal intensity and enhancement patterns on MR images. Results All cases (n=15) showed joint or bursa effusion. The primary lesion attached to the bursa wall adjacent to the bone in 13 cases and to the lateral wall in two cases. CT shows a mass with fatty tissue attenuation values in the suprapatellar pouch (n=3) or subdeltoid bursa with an erosion of the humeral head (n=2), among them two cases showed branched slightly high density in the center of the fat density tissue. Fifteen cases on routine MRI display mass-like subsynovial mass with fatty tissue signal on all of the sequences and suppression of the signal on fat-suppression sequences. Among them, five lesions showed branched slightly low T1-weighted imaging, high proton density-weighted imaging, and T2-weighted imaging signals in the center. It showed the enhancement of the linear surface and the bursa wall in contrast-enhanced MRI (n=3). Conclusion Lipoma arborescens have specific CT and MRI features that enable them to make a conclusive diagnosis of this rare condition, which helps the diagnosis before treatment.

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MRI features of different types of sinonasan rhabdomyosarcomas: a series of eleven cases

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20210030 ◽

2021 ◽

pp. 20210030

Author(s):

Junjie Zeng ◽

Lan Liu ◽

Jiayong Li ◽

Qiling Huang ◽

Leiming Pi ◽

...

Keyword(s):

Bone Destruction ◽

Imaging Features ◽

Resonance Imaging ◽

Bone Invasion ◽

Mri Features ◽

Different Types ◽

Magnetic Resonance Imaging Mri ◽

Haematogenous Metastasis ◽

Ethmoid Sinuses ◽

Pathological Subtypes

Objective: To retrospectively analyze magnetic resonance imaging (MRI) features of various pathological subtypes of sinonasal rhabdomyosarcoma (RMS) and explore correlations between imaging features and pathological subtypes. Methods: In total, 11 cases with embryonal, alveolar or pleomorphic sinonasal RMSs, confirmed by surgical pathology, were selected. Their characteristics and distinctive imaging features were analysed, and the correlation between pathology and imaging features was explored. Results: Bone destruction was observed in all 11 cases with RMS. Expansive growth was predominant in three alveolar and three embryonal RMS cases, and creeping growth was predominant in two alveolar, two embryonal and one pleomorphic RMS cases. Signs of residual mucosa were observed in all 11 cases, and 10 cases showed involvement of multiple sinus cavities and orbital cavities. All cases exhibited mild-to-intermediate enhancement. Conclusion: Sinonasal RMSs have the following characteristic MRI features: ethmoid sinuses and middle nasal conchae are the prevalent sites; lesions are mainly of mild enhancement; tumours exhibit signs of residual mucosa, mild-to-intermediate enhancement and frequent orbital involvement; bone invasion and bone destruction are frequently observed; and haematogenous metastasis is not as common as lymphatic metastasis. RMSs of various pathological subtypes were not significantly distinct by imaging.

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Unusual MR Imaging Features in CT Hyperdense Posterior Fossa Dermoids: Report of Two Cases

Indian Journal of Neurosurgery ◽

10.1055/s-0039-3402594 ◽

2020 ◽

Vol 09 (01) ◽

pp. 63-66

Author(s):

Anbazhagan Sathiaprabhu ◽

Nichanametla Sravani ◽

Krishnan Nagarajan ◽

Sekar Sabarish ◽

Kapil Patil

Keyword(s):

Magnetic Resonance ◽

Posterior Fossa ◽

Magnetization Transfer ◽

The Body ◽

Resonance Spectroscopy ◽

Imaging Features ◽

Signal Loss ◽

Mri Features ◽

Magnetic Resonance Imaging Mri ◽

T2 Hyperintensity

AbstractDermoids, either intracranial or in the rest of the body, usually have typical imaging findings due to their fat contents as fat density in computed tomography (CT) and T1- and T2-hyperintensity in magnetic resonance imaging (MRI). Variable imaging appearances have been described due to soft tissue contents, hair, calcification, or even tooth. Posterior fossa dermoids have been reported as a specific variant that shows hyperdensity in CT and mixed signal intensity in MRI. We report two cases of posterior fossa CT hyperdense dermoids that showed unusual MRI features in the form of signal loss in magnetization transfer images and lipid peak in magnetic resonance spectroscopy. Both patients underwent surgical resection and histopathological confirmation and the causes of this unusual imaging appearance are discussed.

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Imaging features of skeletal muscle lymphoma: a case report and literature review

BMC Medical Imaging ◽

10.1186/s12880-021-00667-4 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Shuxi Gao ◽

Hong Shu ◽

Hua Yang

Keyword(s):

Skeletal Muscle ◽

Lower Extremity ◽

B Cell Lymphoma ◽

Imaging Features ◽

Left Lower Extremity ◽

Non Hodgkin Lymphoma ◽

Guided Biopsy ◽

Mri Features ◽

Positron Emission ◽

Magnetic Resonance Imaging Mri

Abstract Background Diffuse large B cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma (NHL), occurring predominantly in older people. Skeletal muscle lymphoma is a rare form of DLBCL, most frequently affecting the thigh, upper extremities, calf, and pelvis. Case presentation We report a case of skeletal muscle DLBCL that was diagnosed using ultrasound (US)-guided biopsy. A 70-year-old man presented with progressive swelling and pain in the left lower extremity and an elevated erythrocyte sedimentation rate (ESR) and serum C-reactive protein (CRP), ferritin, and CA125 levels. US, magnetic resonance imaging (MRI), and computed tomography (CT) showed diffuse lesions in several muscles of the left lower extremity. Positron emission tomography/CT (PET/CT) showed FDG-uptake in the affected muscles. The patient was treated with chemotherapy and achieved a good response. A systematic review of the literature published between 1992 and 2019 was conducted to investigate the role of imaging, including imaging-guided biopsy, in the diagnosis of skeletal muscle lymphoma. Conclusions Skeletal muscle lymphoma is rare. US and MRI features include enlargement of muscular structures, with preservation of the architecture of the tissue and surrounding anatomical structures. Definitive diagnosis relies on histological and immunohistological analysis of a sample obtained through imaging-guided biopsy.

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MRI Assessment of Sacroiliitis With High-Resolution Protocol

HSS Journal ® ◽

10.1177/15563316211006710 ◽

2021 ◽

pp. 155633162110067

Author(s):

Jennifer L. Berkowitz ◽

Lisa A. Mandl ◽

Alissa J. Burge ◽

John A. Roberts ◽

Bin Lin ◽

...

Keyword(s):

High Resolution ◽

Latent Class ◽

Interobserver Reliability ◽

Latent Class Model ◽

Laboratory Evaluation ◽

Proton Density ◽

Mri Features ◽

Magnetic Resonance Imaging Mri ◽

Highly Correlated ◽

Si Joint

Background: Sacroiliac (SI) joint subchondral resorption on high-resolution magnetic resonance imaging (MRI) may be an early sign of the development of sacroiliitis. At our institution, high-resolution intermediate-weighted (proton density) MRI sequences are used in the workup of suspected spondyloarthritis (SpA). Questions/Purpose: We sought to test the hypothesis that SI joint subchondral resorption might be a useful MRI feature in the diagnosis of sacroiliitis. Methods: We retrospectively reviewed the records of patients with suspected SpA from a single rheumatologist’s practice from January 1, 2010, to December 31, 2017. Patients had an MRI of the SI joints, using our institution’s specialized protocol, and underwent standard physical examination and laboratory evaluation. The sensitivity and specificity of SI joint subchondral resorption in the identification of sacroiliitis were estimated using the clinical diagnosis as the reference standard and from a Bayesian latent class model with conditional dependence. Results: SI joint subchondral resorption on SI joint MRI was highly correlated with a positive diagnosis in patients worked up for axial SpA. It demonstrated superior sensitivity when compared with other MRI features used in the MRI diagnosis of sacroiliitis, such as bone marrow edema pattern, erosion, and ankylosis. Interobserver reliability was high for subchondral resorption. Conclusion: This retrospective study found that subchondral resorption on MRI evaluation of the SI joints appeared to be a sensitive indicator of SpA, potentially of early disease. This imaging feature warrants evaluation in other cohorts of patients suspected of having axial SpA to validate diagnostic performance in diverse populations.

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Extrahepatic Alveolar Echinococcus on Multi-slice Computed Tomography and Magnetic Resonance Imaging

10.21203/rs.3.rs-135974/v1 ◽

2021 ◽

Author(s):

Guo Hui ◽

Wenya Liu ◽

Jian Wang ◽

Yan Xing

Keyword(s):

Magnetic Resonance Imaging ◽

Computed Tomography ◽

Magnetic Resonance ◽

Adrenal Gland ◽

Kappa Statistics ◽

Imaging Features ◽

Resonance Imaging ◽

Mri Features ◽

Magnetic Resonance Imaging Mri ◽

The Brain

Abstract Background. Alveolar echinococcus (AE) is a severe health problem in endemic areas. In recent years, the incidence of this disease in China has been increasing. The study was designed to illustrate the multi-slice computed tomography (MSCT) and magnetic resonance imaging (MRI) features of extrahepatic AE.Methods. A cohort of 33 patients who suffered from extrahepatic AE was enrolled consecutively from January 2012 to December 2017. The MSCT and MRI features of extrahepatic AE were recorded and analyzed by experienced radiologists. The MSCT and MRI agreements for detecting imaging features of extrahepatic AE were calculated using kappa statistics.Results. All cases secondary to hepatic AE, except two primary extrahepatic AE, were found in this study. Locations of extrahepatic AE included 19 (57.6%) lung, 10 (30.3%) adrenal gland, 9 (27.3%) brain, 5 (15.2%) peritoneal cavity, 5 (15.2%) spleen, 4 (12.1%) diaphragm, 3 (9.1%) kidney, 3 (9.1%) retroperitoneal, and 2 (6.1%) vertebra; Involvement of 1 (3.0%) heart, 1 (3.0%) mediastinum, 1 (3.0%) muscle, and 1 (3.0%) pancreas was rare. AE of the lung usually appeared as irregular and scattered nodules with small vacuoles or cavities inside and peripheral distribution. Multiple cerebral nodules with calcification and surrounding edema were the most common features seen in brain AE. Adrenal gland AE presented as plaques containing different sizes of hypodense areas and different amounts of calcification. Injection of contrast medium showed no enhancement of lesions except in the brain. Very good agreements were seen between MSCT and MR for detecting number (κ=0.841, p=0.000), border (κ=0.911, p=0.000) and size (κ=0.864, p=0.000) of extrahepatic AE.Conclusions. MSCT and MRI are reliable imaging methods for the diagnosis of extrahepatic AE. When one AE patient is clinically confirmed, MSCT scan from the head to pelvis should be performed to exclude other organs AE.

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Multinodular and vacuolating neuronal tumor of the cerebrum: three case reports

Revista de Medicina da UFC ◽

10.20513/2447-6595.2021v61n1e43432p1-4 ◽

2021 ◽

Vol 61 (1) ◽

pp. 1-4

Author(s):

Antônio Gláuber Uchôa Lessa ◽

Lucas Alverne Freitas de Albuquerque ◽

Norma Martins de Menezes Morais ◽

Daniel Aguiar Dias ◽

Paulo Ribeiro Nóbrega

Keyword(s):

Clinical Presentation ◽

Case Reports ◽

Low Grade ◽

Imaging Features ◽

Resonance Imaging ◽

Neoplastic Lesion ◽

Mri Features ◽

Rare Lesion ◽

Magnetic Resonance Imaging Mri ◽

Neuronal Tumor

Multinodular and vacuolating neuronal tumor (MVNT) of the cerebrum is a seizure-associated rare lesion that currently appears to be a malformative lesion or hamartoma rather than a low-grade neoplastic lesion. MVNT pathognomonic magnetic resonance imaging (MRI) features allow for diagnostic accuracy in the differential diagnosis. Lesions are usually asymptomatic, nonprogressive and incidentally found requiring only imaging monitoring over time. Although uncommon, it is important to be familiar with MVNT clinical presentation and key imaging features. We here present a series of three cases with imaging findings similar to those described in the literature. These patients were followed with serial neuroimaging.

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Screening for Inherited Metabolic Disorders by Tandem Mass Spectrometry May Miss L-2 Hydroxy Glutaric Aciduria: A Report of Two Cases

Journal of Pediatric Neurology ◽

10.1055/s-0041-1731773 ◽

2021 ◽

Author(s):

Dipti Baskar ◽

Saraswati Nashi ◽

Srijithesh P. Rajendran ◽

Gautham Arunachal ◽

Rita Christopher ◽

...

Keyword(s):

Mass Spectrometry ◽

Genetic Analysis ◽

Tandem Mass Spectrometry ◽

Tandem Mass ◽

Imaging Features ◽

Glutaric Aciduria ◽

Mri Features ◽

Characteristic Features ◽

Magnetic Resonance Imaging Mri ◽

High Degree

AbstractL-2 hydroxy glutaric aciduria (L-2HGA) is an autosomal recessive neurometabolic disorder. It is characterized by a variety of clinical features and typical radiological features which aids in diagnosis. We report two cases that presented with unexplained intellectual impairment and seizures. Magnetic resonance imaging (MRI) brain showed characteristic features of L-2HGA. Tandem mass spectrometry was negative in both cases. Genetic analysis was done based on typical imaging features which confirmed the diagnosis of L-2HGA. For patients with unexplained developmental delay and typical MRI features, a high degree of suspicion is necessary to confirm the diagnosis with targeted genetic analysis.

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Vaginal masses: magnetic resonance imaging features with pathologic correlation

Acta Radiologica ◽

10.1080/02841850701552926 ◽

2007 ◽

Vol 48 (8) ◽

pp. 921-933 ◽

Cited By ~ 23

Author(s):

K. M. Elsayes ◽

V. R. Narra ◽

J. R. Dillman ◽

V. Velcheti ◽

O. Hameed ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Mr Imaging ◽

Imaging Features ◽

Resonance Imaging ◽

Cross Sectional ◽

Pelvic Mri ◽

Mri Features ◽

Cross Sectional Imaging ◽

Magnetic Resonance Imaging Mri

The detection of vaginal lesions has increased with the expanding use of cross-sectional imaging. Magnetic resonance imaging (MRI)—with its high-contrast resolution and multiplanar capabilities—is often useful for characterizing vaginal masses. Vaginal masses can be classified as congenital, inflammatory, cystic (benign), and neoplastic (benign or malignant) in etiology. Recognition of the typical MR imaging features of such lesions is important because it often determines the treatment approach and may obviate surgery. Finally, vaginal MR imaging can be used to evaluate post-treatment changes related to previous surgery and radiation therapy. In this article, we will review pertinent vaginal anatomy, vaginal and pelvic MRI technique, and the MRI features of a variety of vaginal lesions with pathological correlation.

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Diffuse midline gliomas, H3 K27M-mutant are associated with less peritumoral edema and contrast enhancement in comparison to glioblastomas, H3 K27M-wildtype of midline structures

PLoS ONE ◽

10.1371/journal.pone.0249647 ◽

2021 ◽

Vol 16 (8) ◽

pp. e0249647

Author(s):

Rouzbeh Banan ◽

Arash Akbarian ◽

Majid Samii ◽

Amir Samii ◽

Helmut Bertalanffy ◽

...

Keyword(s):

Contrast Enhancement ◽

Lower Probability ◽

Imaging Features ◽

Peritumoral Edema ◽

Mri Features ◽

Histological Criteria ◽

Magnetic Resonance Imaging Mri ◽

Lower Contrast ◽

Diffuse Midline Glioma

Purpose The entity ‘diffuse midline glioma, H3 K27M-mutant (DMG)’ was introduced in the revised 4th edition of the 2016 WHO classification of brain tumors. However, there are only a few reports on magnetic resonance imaging (MRI) of these tumors. Thus, we conducted a retrospective survey focused on MRI features of DMG compared to midline glioblastomas H3 K27M-wildtype (mGBM-H3wt). Methods We identified 24 DMG cases and 19 mGBM-H3wt patients as controls. After being retrospectively evaluated for microscopic evidence of microvascular proliferations (MVP) and tumor necrosis by two experienced neuropathologists to identify the defining histological criteria of mGBM-H3wt, the samples were further analyzed by two experienced readers regarding imaging features such as shape, peritumoral edema and contrast enhancement. Results The DMG were found in the thalamus in 37.5% of cases (controls 63%), in the brainstem in 50% (vs. 32%) and spinal cord in 12.5% (vs. 5%). In MRI and considering MVP, DMG were found to be by far less likely to develop peritumoral edema (OR: 0.13; 95%-CL: 0.02–0.62) (p = 0.010). They, similarly, were associated with a significantly lower probability of developing strong contrast enhancement compared to mGBM-H3wt (OR: 0.10; 95%-CL: 0.02–0.47) (P = 0.003). Conclusion Despite having highly variable imaging features, DMG exhibited markedly less edema and lower contrast enhancement in MRI compared to mGBM-H3wt. Of these features, the enhancement level was associated with evidence of MVP.

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Cross-sectional Imaging Features of Primary Retroperitoneal Tumors and Their Subsequent Treatment

Journal of Clinical Imaging Science ◽

10.4103/2156-7514.156135 ◽

2015 ◽

Vol 5 ◽

pp. 24 ◽

Cited By ~ 4

Author(s):

Turker Acar ◽

Mustafa Harman ◽

Serkan Guneyli ◽

Kazim Gemici ◽

Duran Efe ◽

...

Keyword(s):

Tissue Characterization ◽

Malignant Tumors ◽

Subsequent Treatment ◽

Benign Tumors ◽

Imaging Features ◽

Cross Sectional ◽

Mri Features ◽

Retroperitoneal Tumors ◽

Tissue Contrast ◽

Magnetic Resonance Imaging Mri

Basically malignant tumors in the retroperitoneal region arise from a heterogeneous group of tissues: mesodermal, neurogenic, germ cell, and lymphoid. Although rare, benign tumors and cystic masses can be also encountered in retroperitoneal space. Developments in computed tomography (CT) and magnetic resonance imaging (MRI) have contributed to both diagnosis and staging of the retroperitoneal tumors. High spatial resolution and superiority in calcification make CT indispensable; on the other hand, MRI has a better soft-tissue contrast resolution which is essential for the assessment of vascular invasion and tissue characterization. The aim of this article is to review the CT and MRI features of retroperitoneal tumors and their subsequent management.

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