scholarly journals Residual cholesteatoma of the mastoid cavity presenting with radiologic signal of a cholesterol granuloma: A case report

2018 ◽  
Vol 4 (2) ◽  
pp. 21
Author(s):  
Marilyn Isabel ◽  
Jean Chénard ◽  
Margaret Aron
Keyword(s):  
Temporal Bone ◽  
Diffusion Weighted Imaging ◽  
Mastoid Cavity ◽  
Cholesterol Granuloma ◽  
Resonance Imaging ◽  
Surgical Exploration ◽  
Diffusion Restriction ◽  
Recent Onset ◽  
Appropriate Treatment ◽  
Magnetic Resonance Imaging Mri

Introduction: Cholesteatoma and cholesterol granuloma can both occur in the temporal bone. Their distinct magnetic resonance imaging (MRI) signals are generally used to help differentiate one from the other to plan appropriate treatment, which differs based on the pathology.Case presentation: We present a patient with recent-onset facial paralysis whose mastoid cavity was filled with tissue radiologically resembling cholesterol granuloma but that turned out to be cholesteatoma upon surgical exploration. Complete disease extirpation was thus completed rather than simple marsupialization, the latter of which would have been sufficient in the case of cholesterol granuloma.Discussion: Cholesteatoma, although usually hypointense on T1-weighted imaging (T1WI) MRI, hyperintense on T2-weighted imaging (T2WI) MRI and showing diffusion restriction on diffusion-weighted imaging can occasionally present with an atypical MRI signal, for example, one suggestive of cholesterol granuloma.Conclusions: The clinician should keep in mind the possible diagnosis of cholesteatoma despite an atypical MRI signal in the temporal bone.

The Diagnostic Value of MRI in Traumatic Brachial Plexus Injury

1994 ◽  
Vol 19 (1) ◽  
pp. 55-59 ◽  
Author(s):  
M. OCHI ◽  
Y. IKUTA ◽  
M. WATANABE ◽  
K. KIMOR ◽  
K. ITOH
Keyword(s):  
Brachial Plexus ◽  
Nerve Root ◽  
Brachial Plexus Injury ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Nerve Roots ◽  
Surgical Exploration ◽  
Nerve Root Avulsion ◽  
Magnetic Resonance Imaging Mri ◽  
The Individual

Findings in 34 patients with traumatic brachial plexus injury documented by surgical exploration and intra-operative somatosensory-evoked potentials were correlated with findings on myelography and magnetic resonance imaging (MRI) to determine whether MRI can identify nerve root avulsion. The coronal and sagittal planes were not able to demonstrate avulsion of the individual nerve roots. The axial and axial oblique planes did provide useful information to determine which nerve root was avulsed in the upper plexus, although it was difficult to clearly delineate the lower cervical rootlets. The accuracy of MRI was 73% for C5 and 64% for C6 and that of myelograpby 63% for C5 and 64% for C6. Thus, the diagnostic accuracy of MRI for upper nerve roots was slightly superior to myelography. Although its primary diagnostic value is limited to the upper nerve roots whose avulsion is relatively difficult to diagnose by myelography, MRI can provide useful guidance in the waiting period prior to surgical exploration after brachial plexus injury.

Magnetic Resonance Imaging of the Facial Nerve

1989 ◽  
Vol 101 (3) ◽  
pp. 295-301 ◽  
Author(s):  
Donald G. Wortham ◽  
Louis M. Teresi ◽  
Robert B. Lufkin ◽  
William N. Hanafee ◽  
Paul H. Ward
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Facial Nerve ◽  
Temporal Bone ◽  
Resonance Imaging ◽  
Mr Images ◽  
Beam Hardening ◽  
Parotid Tumors ◽  
Seventh Nerve ◽  
Magnetic Resonance Imaging Mri

Magnetic resonance imaging (MRI) of the facial nerve was evaluated by studying normal volunteers and patients with diseases of the facial nerve with a 0.3 Tesla permanent-magnet MRI system with special surface colls. The normal MR images were correlated with the anatomy of thin cryosection specimens of fresh cadavers. The seventh nerve was followed from its nucleus in the brainstem through the temporal bone to the parotid gland bed. The entire labyrinth and tympanic portions, as well as the geniculate ganglion, could be shown with appropriate scan planes. Examples of brainstem diseases affecting the facial nerve and nucleus, facial neuromas, parotid tumors involving the facial nerve, and other diseases were studied. MRI is a technique that allows unique evaluation of the entire course of the facial nerve. It produces superior Images of the facial nerve with high-contrast resolution. Unlike computed tomography, there is no beam-hardening artifact from the temporal bone or exposure to ionizing radiation and contrast agents. MRI also allows visualization of the main trunks of the facial nerve in the parotid bed not possible with any other imaging technique.

scholarly journals Endoscopic Resection of a Cerebellopontine Angle Epidermoid Cyst via a Retrosigmoid Approach

2019 ◽  
Vol 80 (S 03) ◽  
pp. S330-S330
Author(s):  
Frederick Luke Hitti ◽  
John Y.K. Lee
Keyword(s):  
Magnetic Resonance Imaging ◽  
Epidermoid Cyst ◽  
Diffusion Weighted Imaging ◽  
Facial Pain ◽  
Cerebellopontine Angle ◽  
Retrosigmoid Approach ◽  
Resonance Imaging ◽  
Sharp Dissection ◽  
Magnetic Resonance Imaging Mri ◽  
Tumor Debulking

A variety of lesions may arise within the cerebellopontine angle (CPA). Schwannomas and meningiomas are most commonly found in this location; however epidermoid cysts may also be found in this area. Here, we present the case of a 31-year-old man with severe right facial pain. Magnetic resonance imaging (MRI) demonstrated a right CPA mass that had heterogenous intensity on T2-weighted imagining and restricted diffusion on diffusion-weighted imaging. The patient was offered resection of the mass for treatment of his facial pain via an endoscopic retrosigmoid approach. We provide a video that illustrates the steps taken to resect this mass endoscopically. The mass was white and friable. The tumor was resected using a combination of sharp dissection with the microscissors and round knife and aspiration. As the tumor was removed, the 5th nerve was visualized deep to the tumor. The tumor was freed from any adhesions and was resected piecemeal. The round knife was used to free the tumor from surrounding venous structures. The brainstem and origin of the trigeminal nerve were visualized with further tumor debulking. We moved inferiorly to resect the remainder of the tumor. We worked around the surrounding vasculature to resect the tumor. Advancing the endoscope farther, we visualized Meckel's cave. The wound was irrigated and closed in standard fashion. Tissue pathology confirmed a diagnosis of epidermoid cyst. The vast majority of the mass was removed and the patient had resolution of his facial pain postoperatively.The link to the video can be found at: https://youtu.be/fSw5sw8xQz0.

scholarly journals A case of a temporal bone meningioma presenting as a serous otitis media

2014 ◽  
Vol 3 (10) ◽  
pp. 204798161455504 ◽  
Author(s):  
Simon Nicolay ◽  
Bert De Foer ◽  
Anja Bernaerts ◽  
Joost Van Dinther ◽  
Paul M Parizel
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Temporal Bone ◽  
Otitis Media ◽  
Middle Ear ◽  
Imaging Features ◽  
Resonance Imaging ◽  
Nasopharyngeal Tumor ◽  
Magnetic Resonance Imaging Mri ◽  
Serous Otitis Media

We report the imaging features of a case of a temporal bone meningioma extending into the middle ear cavity and clinically presenting as a serous otitis media. Temporal bone meningioma extending in the mastoid or the middle ear cavity, however, is very rare. In case of unexplained or therapy-resistant serous otitis media and a nasopharyngeal tumor being ruled out, a temporal bone computed tomography (CT) should be performed. If CT findings are suggestive of a temporal bone meningioma, a magnetic resonance imaging (MRI) examination with gadolinium will confirm diagnosis and show the exact extension of the lesion.

Magnetic resonance imaging and diffusion‐weighted imaging in methylmalonic acidemia

2005 ◽  
Vol 46 (1) ◽  
pp. 101-103 ◽  
Author(s):  
A. Yeşildağ ◽  
A. Ayata ◽  
B. Baykal ◽  
M. Koroglu ◽  
H. Yıldız ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Diffusion Weighted Imaging ◽  
Methylmalonic Acidemia ◽  
Resonance Imaging ◽  
Laboratory Findings ◽  
Diffusion Weighted ◽  
Magnetic Resonance Imaging Mri ◽  
The Brain ◽  
And Diffusion

Methylmalonic acidemia (MMA) is an inborn disorder of amino acid metabolism, often presenting with neurological symptoms. We present the results of magnetic resonance imaging (MRI) and diffusion‐weighted imaging (DWI) of the brain in a 16‐month‐old male patient with classic neurological and laboratory findings for MMA. MRI demonstrated the hyperintensity within globi pallidi both on T2‐weighted image and DWI during the acute episode of metabolic acidosis.

Neuroimaging of Intracerebral Hemorrhage

Neurosurgery ◽  
2020 ◽  
Vol 86 (5) ◽  
pp. E414-E423 ◽  
Author(s):  
Rima S Rindler ◽  
Jason W Allen ◽  
Jack W Barrow ◽  
Gustavo Pradilla ◽  
Daniel L Barrow
Keyword(s):  
Intracerebral Hemorrhage ◽  
Near Infrared ◽  
Dual Energy Ct ◽  
High Morbidity ◽  
Resonance Imaging ◽  
Novel Technologies ◽  
Appropriate Treatment ◽  
Rapid Mri ◽  
Magnetic Resonance Imaging Mri ◽  
Noncontrast Computed Tomography

Abstract Intracerebral hemorrhage (ICH) accounts for 10% to 20% of strokes worldwide and is associated with high morbidity and mortality rates. Neuroimaging is indispensable for rapid diagnosis of ICH and identification of the underlying etiology, thus facilitating triage and appropriate treatment of patients. The most common neuroimaging modalities include noncontrast computed tomography (CT), CT angiography (CTA), digital subtraction angiography, and magnetic resonance imaging (MRI). The strengths and disadvantages of each modality will be reviewed. Novel technologies such as dual-energy CT/CTA, rapid MRI techniques, near-infrared spectroscopy, and automated ICH detection hold promise for faster pre- and in-hospital ICH diagnosis that may impact patient management.

scholarly journals Anatomic Imaging of the Prostate

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Anil Bhavsar ◽  
Sadhna Verma
Keyword(s):  
Diffusion Weighted Imaging ◽  
The Other ◽  
Resonance Imaging ◽  
Normal Prostate ◽  
Contrast Enhanced ◽  
Magnetic Resonance Imaging Mri ◽  
Prostate Cancers ◽  
Mr Spectroscopic Imaging ◽  
Contrast Enhanced Mri

The important role of magnetic resonance imaging (MRI) in the anatomic evaluation, detection, and staging of prostate cancer is well established. This paper focuses on the pertinent embryologic, anatomic, and imaging facts regarding both the normal prostate and the several examples of prostate cancers as well as staging implications. The discussion primarily includes findings related to T2-weighted imaging as opposed to the other functional sequences, including diffusion weighted imaging (DWI) or dynamic contrast enhanced MRI and MR spectroscopic imaging, respectively.

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