Search results for: Ashkan A. Malayeri

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Non‐Invasive Tumor Grade Evaluation in Von Hippel–Lindau‐Associated Clear Cell Renal Cell Carcinoma: A Magnetic Resonance Imaging‐Based Study

Aryan Zahergivar, Pouria Yazdian Anari, Neil Mendhiratta, Nathan Lay, more

Journal of Magnetic Resonance Imaging > 60 > 3 > 1076 - 1081

Background Pathology grading is an essential step for the treatment and evaluation of the prognosis in patients with clear cell renal cell carcinoma (ccRCC). Purpose To investigate the utility of texture analysis in evaluating Fuhrman grades of renal tumors in patients with Von Hippel–Lindau (VHL)‐associated ccRCC, aiming to improve non‐invasive diagnosis and personalized treatment. Study Type...

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Preoperative imaging for locoregional staging of bladder cancer

S. Mojdeh Mirmomen, Atul B. Shinagare, Kristin E. Williams, Stuart G. Silverman, more

Abdominal Radiology > 2019 > 44 > 12 > 3843-3857

Bladder cancer is the ninth most common cancer, expected to lead to an estimated 17,670 deaths in the United States in 2019. Clinical management and prognosis of bladder cancer mainly depend on the extent of locoregional disease, particularly whether bladder muscle is involved. Therefore, bladder cancer is often divided into superficial, non-muscle-invasive bladder cancer and muscle-invasive bladder...

article

Evaluation of incidental pelvic fluid in relation to physiological changes in healthy pubescent children using pelvic magnetic resonance imaging

Ashkan Tadayoni, Faraz Farhadi, S. Mojdeh Mirmomen, Ahmad Shafiei, more

Pediatric Radiology > 2019 > 49 > 6 > 784-790

Background Peritoneal free fluid can indicate an underlying disease process; however detection of minimal peritoneal free fluid in healthy children is not uncommon. Objective To assess the significance of incidental peritoneal free fluid within healthy children by MRI and its relation to physiological changes during puberty. Materials and methods This prospective study was performed on 32 healthy...

article

Assessment of multiphasic contrast-enhanced MR textures in differentiating small renal mass subtypes

Uyen N. Hoang, S. Mojdeh Mirmomen, Osorio Meirelles, Jianhua Yao, more

Abdominal Radiology > 2018 > 43 > 12 > 3400-3409

Purpose This study seeks to evaluate the use of quantitative texture parameters extracted from multiphasic contrast-enhanced magnetic resonance (MR) imaging in differentiating between benign and malignant masses (oncocytoma vs. clear cell and papillary RCC) and between common subtypes of renal cell carcinoma (clear cell vs. papillary RCC) in small renal masses (< 4 cm). Method One-hundred and...

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Thoracic involvement in Erdheim-Chester disease: computed tomography imaging findings and their association with the BRAF^V600E mutation

S. Mojdeh Mirmomen, Arlene Sirajuddin, Moozhan Nikpanah, Rolf Symons, more

European Radiology > 2018 > 28 > 11 > 4635-4642

Objectives To investigate the computed tomography (CT) thoracic findings in Erdheim-Chester disease (ECD) and evaluate the association of these findings with the BRAF^V600E mutation. Methods This was a prospective study of patients with ECD (n=61, men=46) who underwent thoracic CT imaging. CT examinations were independently interpreted by two experienced radiologists. Association of imaging findings...

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Abdominal involvement in Erdheim-Chester disease (ECD): MRI and CT imaging findings and their association with BRAF^V600E mutation

Moozhan Nikpanah, Lauren Kim, S. Mojdeh Mirmomen, Rolf Symons, more

European Radiology > 2018 > 28 > 9 > 3751-3759

Objectives To use magnetic resonance imaging (MRI) and computed tomography (CT) to define abdominal involvement in Erdheim–Chester disease (ECD), and to investigate the association between these findings and the BRAF^V600E mutation. Methods This prospective study was performed on 61 ECD patients (46 men). The MRI and CT imaging studies were reviewed independently by two experienced radiologists....

article

Germline VHL gene variant in patients with von Hippel-Lindau disease does not predict renal tumor growth

Faraz Farhadi, Moozhan Nikpanah, Xiaobai Li, Rolf Symons, more

Abdominal Radiology > 2018 > 43 > 10 > 2743-2749

Purpose To determine whether the type of VHL gene pathogenic variant influences the growth rate or CT enhancement values of renal lesions in VHL patients. Materials and methods Thirty-two VHL patients (19 male) were selected from a prospectively maintained imaging database for patients that underwent surgical tumor resection between 2014 and 2016. One hundred and eleven VHL lesions were marked for...

article

Differentiating papillary type I RCC from clear cell RCC and oncocytoma: application of whole-lesion volumetric ADC measurement

Anna K. Paschall, S. Mojdeh Mirmomen, Rolf Symons, Amir Pourmorteza, more

Abdominal Radiology > 2018 > 43 > 9 > 2424-2430

Purpose To determine whether objective volumetric whole-lesion apparent diffusion coefficient (ADC) distribution analysis improves upon the capabilities of conventional subjective small region-of-interest (ROI) ADC measurements for prediction of renal cell carcinoma (RCC) subtype. Methods This IRB-approved study retrospectively enrolled 55 patients (152 tumors). Diffusion-weighted imaging DWI was...

article

¹⁸F‐Fluorodeoxyglucose–Positron Emission Tomography As an Imaging Biomarker in a Prospective, Longitudinal Cohort of Patients With Large Vessel Vasculitis

Peter C. Grayson, Sara Alehashemi, Armin A. Bagheri, Ali Cahid Civelek, more

Arthritis & Rheumatology > 70 > 3 > 439 - 449

Objective To assess the clinical value of ¹⁸F‐fluorodeoxyglucose (FDG) positron emission tomography (PET) in a prospective cohort of patients with large vessel vasculitis (LVV) and comparator subjects. Methods Patients with Takayasu arteritis and giant cell arteritis were studied, along with a comparator group consisting of patients with hyperlipidemia, patients with diseases that mimic LVV, and...

article

Advances in medical imaging for the diagnosis and management of common genitourinary cancers

Mohammad H. Bagheri, Mark A. Ahlman, Liza Lindenberg, Baris Turkbey, more

Urologic Oncology: Seminars and Original Investigations > 2017 > 35 > 7 > 473-491

Medical imaging of the 3 most common genitourinary (GU) cancers—prostate adenocarcinoma, renal cell carcinoma, and urothelial carcinoma of the bladder—has evolved significantly during the last decades. The most commonly used imaging modalities for the diagnosis, staging, and follow-up of GU cancers are computed tomography, magnetic resonance imaging (MRI), and positron emission tomography (PET). Multiplanar...

article

Three‐dimensional T1 and T2* mapping of human lung parenchyma using interleaved saturation recovery with dual echo ultrashort echo time imaging (ITSR‐DUTE)

Neville D. Gai, Ashkan A. Malayeri, David A. Bluemke

Journal of Magnetic Resonance Imaging > 45 > 4 > 1097 - 1104

Purpose To develop and assess a new technique for three‐dimensional (3D) full lung T1 and T2* mapping using a single free breathing scan during a clinically feasible time. Materials and Methods A 3D stack of dual‐echo ultrashort echo time (UTE) radial acquisition interleaved with and without a WET (water suppression enhanced through T1 effects) saturation pulse was used to map T1 and T2* simultaneously...

article

Long T2 suppression in native lung 3-D imaging using k-space reordered inversion recovery dual-echo ultrashort echo time MRI

Neville D. Gai, Ashkan A. Malayeri, David A. Bluemke

Magnetic Resonance Materials in Physics, Biology and Medicine > 2017 > 30 > 4 > 387-395

Objective Long T2 species can interfere with visualization of short T2 tissue imaging. For example, visualization of lung parenchyma can be hindered by breathing artifacts primarily from fat in the chest wall. The purpose of this work was to design and evaluate a scheme for long T2 species suppression in lung parenchyma imaging using 3-D inversion recovery double-echo ultrashort echo time imaging...

article

Diagnosis of Giant Cell Arteritis in an Asymptomatic Patient

Kam A. Newman, Mark A. Ahlman, Marybeth Hughes, Ashkan A. Malayeri, more

Arthritis & Rheumatology > 68 > 5 > 1135 - 1135

article

National Institutes of Health Perspective on Reports of Gadolinium Deposition in the Brain

Ashkan A. Malayeri, Kristina M. Brooks, L. Henry Bryant, Robert Evers, more

Journal of the American College of Radiology > 2016 > 13 > 3 > 237-241

article

Analysis of fiducials implanted during EUS for patients with localized rectal cancer receiving high-dose rate endorectal brachytherapy

Shalini Moningi, Amanda J. Walker, Ashkan A. Malayeri, Lauren M. Rosati, more

Gastrointestinal Endoscopy > 2015 > 81 > 3 > 765-769.e1

article

Utility of a High-Resolution 3D MRI Sequence (3D-SPACE) for Evaluation of Congenital Heart Disease

Ashkan A. Malayeri, Philip J. Spevak, Stefan L. Zimmerman

Pediatric Cardiology > 2015 > 36 > 7 > 1510-1514

The purpose of this study was to evaluate the role of a high-resolution 3D dark-blood turbo spin echo sequence with variable flip angles (3D-SPACE) in evaluation of congenital heart disease. SPACE sequence was performed in 20 patients (mean age, 17.6 ± 12.6 years, range 9 months–57 years, M: 13) with either unrepaired (N = 3) or post-repair (n = 17) congenital heart disease. All scans were performed...

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Intracranial germinoma in the pineal region arising after subtotal resection of epidermoid cyst: case report

Amanda J. Walker, Minh-Phuong Huynh-Le, David Nauen, Ashkan A. Malayeri, more

Child's Nervous System > 2014 > 30 > 5 > 963-966

We present an unusual case of a germinoma of the pineal region arising adjacent to an epidermoid cyst in a 16-year-old male. Initial imaging findings were classic for epidermoid cyst. The patient underwent two partial resections at an outside institution, each specimen demonstrating pure epidermoid cyst. Follow-up imaging over a period of 24 months showed an area of progressive contrast enhancement...

article

128-Slice dual source coronary CTA: defining optimal arterial enhancement levels

Ashkan A. Malayeri, Stefan L. Zimmerman, Spencer T. Lake, Elliot K. Fishman, more

Emergency Radiology > 2014 > 21 > 5 > 499-504

This study aims to correlate coronary artery enhancement levels with quality of vessel visualization and calcified plaque visualization using a 128-slice dual-source CT (DSCT) scanner. Coronary CT angiography exams from 52 patients, mean age of 55 years (range, 22–90) and mean weight of 184 lbs (range, 120–320 lbs), were reviewed retrospectively. Contrast infusion rates ranged from 4.5 to 7 mL/s (mean,...

article

Left ventricular structure and function in patients with rheumatoid arthritis, as assessed by cardiac magnetic resonance imaging

Jon T. Giles, Ashkan A. Malayeri, Veronica Fernandes, Wendy Post, more

Arthritis & Rheumatology > 62 > 4 > 940 - 951

ObjectiveHeart failure is a major contributor to cardiovascular morbidity and mortality in patients with rheumatoid arthritis (RA), but little is known about myocardial structure and function in this population. This study was undertaken to assess the factors associated with progression to heart failure in patients with RA. MethodsWith the use of cardiac magnetic resonance imaging, measures of myocardial...

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Relation of Aortic Wall Thickness and Distensibility to Cardiovascular Risk Factors (from the Multi-Ethnic Study of Atherosclerosis [MESA])

Ashkan A. Malayeri, Shunsuke Natori, Hossein Bahrami, Alain G. Bertoni, more

The American Journal of Cardiology > 2008 > 102 > 4 > 491-496

To determine the relation between aortic wall thickness (WT) and aortic distensibility (AD) with traditional cardiovascular risk factors in the Multi-Ethnic Study of Atherosclerosis (MESA) cohort, 1,053 participants in MESA who underwent cardiac magnetic resonance imaging were consecutively selected for the measurement of aortic WT and AD. Double inversion-recovery fast spin-echo images of the thoracic...

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Search results for: Ashkan A. Malayeri

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