May-June 2017

Introduction

MR Neurography: State of the Art

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Avneesh Chhabra

It is my pleasure to write an editorial for this exciting AJNR News Digest on the topic of MR neurography (MRN). MRN has come a long way since its introduction in 1992 by Howe et al.1 Several technical developments have occurred in this domain over the last decade,2–6 and the increasing use of MRN has impacted and considerably changed the practice of … more »

Head & Neck

Visualization of the Peripheral Branches of the Mandibular Division of the Trigeminal Nerve on 3D Double-Echo Steady-State with Water Excitation Sequence

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Hiroyuki Fujii

Cranial nerve impairments can significantly compromise functionality and quality of life. Knowledge of the anatomic course of each cranial nerve and its relationship with surrounding structures is important for diagnosing various cranial pathologies and preventing complications from surgical interventions.

Despite recent advances in MR imaging technology, visualization of the entire course of the cranial nerves, especially the extracranial segments, remains challenging … more »

Peripheral Nervous System

Conventional and Functional MR Imaging of Peripheral Nerve Sheath Tumors: Initial Experience

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Shivani Ahlawat

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Laura M. Fayad

Although benign peripheral nerve sheath tumors (PNSTs) are more prevalent than malignant peripheral nerve sheath tumors (MPNSTs), they can share an overlapping clinical presentation and imaging appearance, particularly on conventional MR imaging. As a result, many of these PNSTs are definitively diagnosed via percutaneous or surgical biopsies, which … more »

Peripheral Nervous System

Diffusivity Measurements Differentiate Benign from Malignant Lesions in Patients with Peripheral Neuropathy or Plexopathy

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Esther Yuh

In the multidisciplinary spine conference at our institution, mass-like lesions associated with peripheral nerves appear frequently on the case list. Whether lesions are incidentally discovered during the course of imaging for an unrelated indication or found during the work-up of mononeuropathy or plexopathy, a central clinical question is often whether to perform debulking or en bloc resection, percutaneous biopsy, chemotherapy … more »

Spine

Characterization of Peripheral Nerve Sheath Tumors with 3T Proton MR Spectroscopy

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Laura M. Fayad

My research has focused on advancing MR imaging techniques, especially noncontrast techniques, for various applications in musculoskeletal tumor imaging, including the detection, characterization, and assessment of treatment response and the differentiation of postsurgical nodular scar from recurrence. A particular challenge in our field is the characterization of peripheral nerve sheath tumors (PNSTs), as benign and malignant PNSTs share imaging … more »

Spine

Quantitative Evaluation and Visualization of Lumbar Foraminal Nerve Root Entrapment by Using Diffusion Tensor Imaging: Preliminary Results

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Yawara Eguchi

Lumbar nerve entrapment causes low back pain and radiculopathy, but discrepancies between clinical symptoms and the range of compression of the nerve root on conventional MR images are often found. Asymptomatic intervertebral disc degeneration and herniation are often seen in clinical practice, and these discrepancies can confuse spine surgeons.

Lumbar foraminal stenosis is a condition in which a nerve root or … more »