Imaging is an indispensable tool in patients with clinical suspicion of infrahyoid neck disease. CT and MR imaging can establish a positive diagnosis by showing a true mass (versus a pseudomass). In addition, by defining the exact space of origin of the lesion and its characteristics (CT density, MR signal, ...

Cross-sectional imaging with CT and MR imaging plays an indispensable complementary role to endoscopy in the pretherapeutic work-up of laryngeal and hypopharyngeal cancer and is very valuable for the detection of tumor recurrence after surgery or radiation treatment as well. Close interdisciplinary co-operation and the radiologist's familiarity with therapeutic options ...

Correlating findings on imaging studies with those on histopathologic examination can define the limitations and strengths of the radiologist's imaging armamentarium. Although CT is particularly strong in identifying the character of the matrix of a head and neck lesion, MR imaging has proved superior in the mapping of most malignant ...

The research described in this article investigated the relationship between selected background variables and the performance of 2546 candidates who took a certification examination in magnetic resonance imaging in 1995. Five variables related to training and experience were investigated: type of training in MR, amount of training in MR, years ...

PURPOSE: The traditional approach to investigating suspected osteomyelitis in children includes conventional radiography and bone scintigraphy. The roles of US, CT and MR imaging are controversial. Our objective was to determine whether the additional use of these modalities would yield information likely to lead to treatment modification. MATERIAL AND METHODS: ...

The purpose of this study was to define the normal anatomic structures in the canine larynx with magnetic resonance images. TI-weighted images were taken in the sagittal and transverse planes. The MR images were obtained comparing MR images to dissection planes. Magnetic resonance imaging provides excellent anatomic detail of laryngeal ...

Access to fully processed activation maps in near real time during a functional MR examination enables run-to-run assessment of results. This is particularly useful in clinical studies, since the results of the functional MR examination can be ascertained before the patient leaves the MR suite, permitting interactive tailoring of the ...

MR imaging is an invaluable tool for the evaluation of congenital abnormalities and vascular birthmarks of the extremities in children. These abnormalities of the immature musculoskeletal system are often underestimated by radiography. MR imaging is useful for diagnosis, assisting in therapy, showing response to treatment, and determining prognosis. Localized and ...

MR imaging plays a major role in the evaluation of children with soft tissue and bone tumors. While the imaging characteristics of these lesions are often nonspecific, MR imaging provides valuable information on the extent of disease and relationship of tumors to the neurovascular bundle and other vital structures. This ...

OBJECTIVE: To demonstrate the value of MR imaging in the diagnosis and differentiation of the various symptomatic complications of osteochondromas, providing pathological correlation with emphasis on the usefulness of MR imaging as a single imaging modality in these patients. DESIGN: We retrospectively reviewed all MR examinations of clinically symptomatic osteochondromas ...

To date, magnetic resonance (MR) is established as an imaging modality in the diagnosis of chest diseases. Because of its excellent distinction of vessels and soft tissue, MR can be performed as the primary imaging procedure before computed tomography in patients with suspected vascular lesions, mediastinal masses, hilar lesions, and ...

Meningococcemia is a life-threatening infection which produces purpura fulminans and extremity gangrene in its most severe form. In patients with gangrene, amputation is usually necessary. The amputations frequently need revision as ischemic changes in the underlying soft tissues and bone are difficult to evaluate at the time of surgery. These ...

We present two cases of surgically proved colloid cysts that were more apparent on CT scans than on MR images. These cysts, while hyperdense on CT scans, were nearly isointense with brain on multiple MR sequences. This relative lack of visibility represents a potential pitfall when imaging a patient with ...

PURPOSE: We present the first in vivo CT and MR imaging description of intraocular lenses (IOLs), which are commonly encountered in elderly patients who have undergone cataract surgery. METHODS: A retrospective review was done of the imaging studies of 20 patients (22 eyes) with IOLs and of three patients (four ...

Evaluation of pelvic pathology is an important part of most radiology practices. Magnetic resonance imaging (MRI) has proven itself to be a useful and cost-effective method in evaluating many of these diseases. This article reviews appropriate MR imaging techniques and findings of common gynecologic disorders. Uterine pathology is categorized into ...

The development of magnetic resonance (MR) microscopy has provided new approaches to histology and histopathology. Recent work has shown the promise of increased sensitivity in animal models of chemically induced hepatotoxicity. However, the field is so new that there is little experience to relate changes seen in MR micrographs to ...

Magnetic resonance imaging, because of its exquisite soft tissue contrast, has dramatically improved the ability to preoperatively stage primary osseous and soft tissue neoplasms. This technique also has allowed the monitoring of the effects of chemotherapy and the screening for recurrence of neoplasms. The role of magnetic resonance imaging in ...

PURPOSE: We studied intrameatal changes in MR enhancement induced by free-tissue implant over time after surgery for acoustic neurinoma. METHODS: Twenty-one patients were examined by MR imaging after suboccipital resection of an acoustic neurinoma. Precontrast and postcontrast MR images were obtained within 3 days after surgery (early MR images), then ...

Renal cancer is diagnosed in 27,000 Americans and accounts for 12,000 deaths per year. Fortunately, improvements in imaging technology have resulted in earlier detection and longer survival. Although computed tomography (CT) and ultrasound (US) have accounted for much of this success, magnetic resonance (MR) imaging can offer several improvements in ...

A wide spectrum of disease processes involve the ischiorectal fossa, including congenital and developmental lesions; inflammatory, traumatic, and hemorrhagic conditions; primary tumors; and pathologic processes outside the ischiorectal fossa with secondary involvement. Both computed tomography (CT) and magnetic resonance (MR) imaging are useful in the definitive diagnosis of these pathologic ...

Magnetic resonance (MR) spectroscopy (MRS) is performed using the same magnets and computers as conventional MR imaging (MRI). However, unlike conventional MRI, which provides structural information, MRS provides chemical information that represents pathologically specific measures useful for diagnosis and monitoring of patients affected by neurological disorders. This review will focus ...

OBJECTIVE: Our objective is to describe the clinical entity and MR imaging appearance of fat necrosis after trauma, a benign cause of palpable soft-tissue lesions in children. A related objective is to establish MR imaging criteria that can be used reliably to differentiate this entity from other more serious causes ...

MR imaging is the modality of choice for the evaluation of the brachial plexus. Regardless of the cross-sectional imaging modality used, a knowledge of the anatomy in the lower neck and thorax is necessary in the interpretation of these studies. Before imaging an attempt should be made to determine the ...

MRS extends the diagnostic power of MRI by displaying the biochemical composition of a selected tissue or region. When MR imaging shows a lesion, the evaluation of the chemical composition by MRS can help determine whether biopsy, observation or medical treatment is indicated. It can save some patients from biopsy ...

Recently, magnetic resonance (MR) imaging has become the preferred method of evaluation for spinal disorders. The vertebrae, intervertebral disks, ligaments, spinal canal, and neural foramen may all be evaluated using current MR imaging techniques. MR imaging with paramagnetic contrast has developed into a valuable technique for diagnosing a tumor, an ...

MR imaging continues to be an integral problem-solving modality in the evaluation of congenital anomalies and acquired diseases of the female genital tract organs and provides effective clinical information to the practicing gynecologist in those patients in whom sonography is technically suboptimal or the results are equivocal. This article describes ...

Two dogs and a cat with intracranial lesions were evaluated by both computed tomography (CT) and magnetic resonance (MR) imaging. In a dog with vestibular syndrome, better quality images of the medulla oblongata surrounded by thick bones were obtained by MR than by CT, on which the appearance of artifacts ...

Pediatric elbow fractures are elusive to radiographic detection and more sophisticated imaging techniques are often required to assess the presence and extension of the fracture line to make appropriate treatment decisions. Arthrography is the current method of choice, but ultrasonography and, more recently, MR imaging have been proposed as alternative ...

PURPOSE: To demonstrate the feasibility of a randomized trial to compare rapid magnetic resonance (MR) imaging with plain radiography as the initial imaging study in patients with low back pain, to test measures of the decision-making process and patient outcomes, and to offer a model for using randomized clinical trials ...

OBJECTIVE: To determine the MR imaging appearance of hemophilic pseudotumor (HP) and its clinical implications. DESIGN AND PATIENTS: Five hemophilic patients (aged 35-77 years) with 12 HPs in various anatomic locations were included in this study. The MR images were retrospectively evaluated for the appearance of the lesions and accompanying ...

PURPOSE: To determine the accuracy of 4.7-T magnetic resonance (MR) imaging for evaluating the mural invasion of esophageal carcinoma. MATERIALS AND METHODS: Sixty-seven esophageal specimens containing 70 squamous cell carcinomas were studied with a 4.7-T MR system with a 4-cm-diameter surface coil. Spin-echo MR images were obtained with a field ...

Focal brain lesions in AIDS may be difficult to diagnose with conventional imaging techniques. Recent advances in magnetic resonance (MR), including MR spectroscopy (MRS) and diffusion-weighted imaging (DWI), may provide additional information in the evaluation of these diseases. MRS of various AIDS brain lesions show distinct chemical profiles; however, several ...

PURPOSE: To investigate the magnetic resonance (MR) imaging appearance of activity-related lower leg pain (shin splints syndrome) and evaluate the relative involvement of bone and soft tissues. MATERIALS AND METHODS: Nineteen patients with activity-related lower leg pain and tenderness on palpation along the posteromedial tibia (shin splints) underwent clinical examination ...

Primary malignant lymphoma of the uterus is a rare disease. We present the MR findings in three cases where the uterus was the initial site. MR findings wer retrospectively evaluated. Although the intact junctional zone is a specific finding for lymphoma, diffuse enlargement of the uterus and relatively homogeneous signal ...

OBJECTIVE: The purpose of this study was to evaluate the accuracy of cortical measurements of experimentally created endosteal cortical lesions and to assess the sensitivity of radiography, CT, and MR imaging in the detection and measurement of such lesions. MATERIALS AND METHODS: Thirty-six cortical lesions were created in three fresh ...

The neuropathology of full-blown, symptomatic AIDS, established in many large autopsy series, has been described in great detail and is now universally accepted. In contrast, the natural history of the changes occurring in the central nervous system during the earlier states of HIV-1 infection remains poorly understood. With specific regard ...

This article outlines the imaging role of MR imaging in evaluating acute orthopedic trauma to the extremities. MR imaging is compared, where possible, with CT scan, scintigraphy, and ultrasound. The article specifically explores the role of MR imaging in evaluating soft tissue injury accompanying fracture, emphasizes an established role in ...

PURPOSE: To determine the accuracy of magnetic resonance (MR) imaging in the evaluation of patients with a history of primary amenorrhea. MATERIALS AND METHODS: Twenty-nine patients with primary amenorrhea underwent T2-weighted MR imaging in the axial and sagittal planes. Contrast material-enhanced and unenhanced T1-weighted MR imaging was performed in selected ...

We report the MR findings in two cases of acute suppurative perithyroiditis. MR has the advantages over other imaging modalities of being able to distinguish areas of inflammation from adjacent normal tissue and of allowing imaging in planes which more accurately demonstrate the extent of the lesion. MR imaging is ...

PURPOSE: To determine clinical predictors useful in differentiation of surgical lesions from medically treated disorders and the role of neuroimaging in children with headache. MATERIALS' AND METHODS: In a 4-year retrospective study, 315 patients with headache and no known neurologic disorder underwent brain magnetic resonance (MR) imaging. Sixty-nine patients also ...

PURPOSE: To depict the complex anatomy of the axilla with CT and MR imaging. MATERIAL AND METHODS: The axillary regions of 2 cadavers (with arms hyperabducted) were examined by means of CT and MR. In this position the cadavers were frozen and cryosectioned. The anatomical sections documented by the MR ...

Selected concepts of MR-pathologic correlation of renal masses are presented in this article by way of illustrative examples, with an emphasis on renal adenocarcinoma. Where applicable, practical uses of these concepts are suggested, particularly in those cases in which the differential diagnosis might be narrowed, such as in the evaluation ...

The use of MR imaging in evaluating renal tumors has expanded beyond the established utility for patients with renal insufficiency and allergy to iodinated contrast. MR imaging is increasingly relied on for the evaluation of small renal lesions. The use of gadolinium chelate contrast agents, high performance MR systems, and ...

Although MR imaging is not a first-line modality for detecting renal cancers, it is useful when computed tomography or ultrasound are limited by artifacts or when contrast media cannot be administered because of renal dysfunction or allergy. MR imaging is commonly used in staging renal cancers, particularly in assessing the ...

PURPOSE: To compare the use of magnetic resonance (MR) imaging and computed tomography (CT) in detection of recurrent nasopharyngeal carcinoma. MATERIALS AND METHODS: Forty-five sets of CT and MR images were obtained in 34 patients. The images were placed in three categories: (a) clinically or radiologically abnormal findings in patients ...

Although CT is usually the first imaging study used to evaluate for retroperitoneal disease, MR imaging is increasingly chosen to further characterize lesions. In addition, MR imaging is the ideal modality for evaluating the extent of retroperitoneal tumors as well as their relationship to adjacent structures and organs. The multiplanar ...

We reviewed imaging findings of CT and MR imaging in 20 cases of surgically confirmed craniopharyngioma in an attempt to determine their relation to patterns of tumor extent. The relationship between these patterns and the frequency of preoperative CT diagnosis and MR imaging diagnosis according to the surgical diagnosis were ...

PURPOSE: To assess the relative accuracies of computed tomography (CT) and magnetic resonance (MR) imaging in the local staging of primary malignant bone and soft-tissue tumors. MATERIALS AND METHODS: At four institutions, 367 eligible patients (aged 6-89 years) with malignant bone or soft-tissue neoplasms in selected anatomic sites were enrolled. ...

The aim of this work is to describe the image findings of renal hydatid disease, especially on MR. Four cases of echinococcal involvement of the kidney were retrospectively reviewed. All patients had intravenous urography (IVU) and US performed. Computed tomography examination was available in three patients and MR in two ...

PURPOSE: To evaluate the economic costs of using computed tomography (CT) vs. magnetic resonance (MR) imaging in the preoperative evaluation of refractory epilepsy patients. METHODS: Preoperative CT and MR imaging findings from 117 patients who underwent surgery for medically refractory epilepsy during a 3.5-year period were reviewed. Cost savings were ...