Optimal Contrast of Imaging Characteristics for 4 Dimensional MRI of the Temporomandibular Joint by Examining the Signal Intensity

2008 ◽  
Vol 7 (2) ◽  
pp. 222-224
Author(s):  
Namrath Chatchaiyan ◽  
Kaoru Koide ◽  
Makoto Tsuchimochi ◽  
Hajime Tanji ◽  
Eiichiro Asano ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Signal Intensity ◽  
Imaging Characteristics

scholarly journals Diagnostic value of magnetic resonance imaging in the analysis of ameloblastoma: report of two cases

2019 ◽  
Vol 22 (3) ◽  
pp. 425-431
Author(s):  
Neiandro Santos Galvão ◽  
Antonione Santos Bezerra Pinto ◽  
Alan Leandro Carvalho Farias ◽  
André Luiz Ferreira Costa ◽  
Sérgio Lúcio Pereira de Castro Lopes ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Additional Information ◽  
Imaging Characteristics ◽  
Magnetic Resonance Imaging Mri

Ameloblastoma is an odontogenic tumor that shares clinical and imaging characteristics with other lesions of the jaws, such as odontogenic keratocyst, which makes the diagnosis difficult. However, in addition to radiographic and tomographic examinations, Magnetic Resonance Imaging (MRI) has been increasingly used, contributing with relevant additional information about the differentiation between solid and liquid components of the lesion. This case report was conducted to present two variations of ameloblastoma and discuss the radiographic, tomographic and MRI contribution in the differential diagnosis between ameloblastoma and odontogenic keratocyst.The signal intensity in T1-weighted MRI revealed internal fluid content in both cases, which was important in the differential diagnosis with other intraosseous lesions such as odontogenic keratocysts. This is probably due to the presence of keratin that increases the viscosity of the content and also for an intermediate signal intensity signal in T2-weighted MRI. Therefore, MRI revealed important internal characteristics of the reported lesions, which was very useful in the establishment of the differential diagnosis with other lesions.

scholarly journals Improvement of bone-erosive temporomandibular joint (TMJ) abnormalities in adolescents undergoing non-surgical treatment: a longitudinal study

2020 ◽  
Vol 49 (5) ◽  
pp. 20190338 ◽  
Author(s):  
Anna-Karin Abrahamsson ◽  
Linda Z Arvidsson ◽  
Milada Cvancarova Småstuen ◽  
Tore A Larheim
Keyword(s):  
Chronic Pain ◽  
Temporomandibular Joint ◽  
Cone Beam Ct ◽  
Functional Limitation ◽  
Young Patients ◽  
Pain Scale ◽  
Imaging Characteristics ◽  
Surgical Methods ◽  
Patient Series

Objectives: To investigate the longitudinal changes of the imaging temporomandibular joint (TMJ) characteristics in young patients with TMJ-related symptoms and treated with non-surgical methods. The severity of self-reported symptoms at follow-up was also investigated. Methods: A cone beam CT (CBCT)/CT follow-up examination [median follow-up 4.1 (1.3–6.4) years] was performed in 22 patients with erosive TMJ abnormalities [baseline median age 16 (12–18) years]. Imaging characteristics were analyzed and the changes between the examinations were categorized as (A) improvement, (B) no change, or (C) worsening. Severity of follow-up symptoms was evaluated using Jaw Functional Limitation Scale (JFLS-8) and Graded Chronic Pain Scale (Grade 0–IV). Analyses were performed separately for left and right TMJ. Findings at baseline and follow-up were compared using McNemar test to account for dependencies. Changes in proportions of hard tissue findings between examinations were assessed using Wilcoxon signed ranks test. Results: A significant reduction in the proportion of patients with erosive abnormalities was found [59.1%, 95% CI (36.4–79.3) %]. Baseline erosions improved in 9/12 (75%) right and 14/15 (93%) left TMJs. About half repaired; developed an intact cortical outline. Number of joints with osteophytes increased (right: p < 0.04, left: p < 0.003). New osteophytes were mostly found in joints with erosive findings. Low or no limitation of jaw function (Jaw Functional Limitation Scale) was found in 12/22 (55%) and no or low intensity of pain (Graded Chronic Pain Scale Grade 0 or I) in 19/22 (86%) at follow-up. Conclusion: We found a high potential for repair of erosive TMJ abnormalities. However, the patient series was small. The majority of patients assessed their symptom severity at follow-up as low.

Rathke cleft cyst intracystic nodule: a characteristic magnetic resonance imaging finding

2005 ◽  
Vol 103 (5) ◽  
pp. 837-840 ◽  
Author(s):  
Mandy J. Binning ◽  
Oren N. Gottfried ◽  
Anne G. Osborn ◽  
William T. Couldwell
Keyword(s):  
Magnetic Resonance ◽  
Signal Intensity ◽  
Imaging Finding ◽  
Magnetic Resonance Imaging Finding ◽  
High Signal ◽  
Cystic Lesions ◽  
Mr Images ◽  
Content Type ◽  
Imaging Characteristics ◽  
Fine Print

Object. The fluid content of Rathke cleft cysts (RCCs) displays variable appearances on magnetic resonance (MR) images and can appear indistinguishable from other intrasellar or suprasellar cystic lesions. Intracystic nodules associated with individual RCCs have been noted, but to date their significance has not been fully explored. Methods. The authors retrospectively reviewed MR imaging studies obtained in patients harboring intrasellar or suprasellar lesions that were consistent with RCCs to identify the presence and imaging characteristics of intracystic nodules. An intracystic nodule was present in nine (45%) of 20 patients with an RCC. All intracystic nodules were clearly visible and displayed a characteristic low signal intensity on T2-weighted MR images. The nodule was only visualized on T1-weighted images in four cases, in which it exhibited a consistent high signal intensity similar to that of the cyst fluid. The nodules did not enhance following the intravenous administration of a contrast agent. Conclusions. Although it is difficult to differentiate RCCs from other sellar cystic lesions because of the variable signal intensities displayed on MR images, the intensity of the intracystic nodule seems consistent on T1- and T2-weighted images, and the nodule is always clearly visible on T2-weighted images. With a nonenhancing cystic lesion that does not cause significant symptoms in the patient, the identification of an intracystic nodule with a characteristic signal intensity will aid in the diagnosis of RCC and the selection of conservative management.

scholarly journals Polyorquidism: case report comparing ultrasonography and magnetic resonance imaging

2020 ◽  
Vol 20 (3) ◽  
pp. 899-903
Author(s):  
Lucas Ribeiro dos Santos ◽  
Márcio Luís Duarte ◽  
Élcio Roberto Duarte ◽  
Felipe Nunes Figueiras
Keyword(s):  
Magnetic Resonance Imaging ◽  
Case Report ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
World Literature ◽  
High Signal ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Imaging Characteristics ◽  
Initial Clinical Evaluation

Abstract Introduction: polyorchidism is an unusual pathology, about 200 cases in the world literature. Case report: we reported a case of polyorchidism in a 16-year-old male patient diagnosed by ultrasound and confirmed by magnetic resonance imaging. Discussion: most of the cases presented, there is a supernumerary testis, but there are reports on more than three, up to five testicles with supranumerical gonads on both sides of the scrotum. The diagnosis is usually performed in late puberty, incidentally, with a painless scrotal mass or at the emergency room, presenting a testicular torsion of the whole hemiscrotum or supernumerary testisalone, and the differential diagnosis should be made with epididymal cyst and spermatocele, besides other extra-testicular masses (hydroceles, varicoceles, lipomas, tumors.) and para-testicular masses (hernias, scrotal calculi). After the initial clinical evaluation, ultrasound is the first line subsidiary exam. Magnetic Resonance Imaging is very helpful, just in case the ultrasound diagnosis is uncertain. The supernumerary testishave the same Magnetic Resonance Imaging characteristics as the normal testes (intermediate signal intensity on T1- weighted images and high signal intensity on T2-weighted images).

Pigmented Villonodular Synovitis

2019 ◽  
pp. 356-358
Author(s):  
Winnie A. Mar
Keyword(s):  
Giant Cell Tumor ◽  
Signal Intensity ◽  
Tendon Sheath ◽  
Pigmented Villonodular Synovitis ◽  
Cell Tumor ◽  
Villonodular Synovitis ◽  
Susceptibility Artifact ◽  
Common Location ◽  
Imaging Characteristics ◽  
Pigmented Villonodular

Chapter 68 on pigmented villonodular synovitis (PVNS) reviews the clinical features, pathology, and imaging characteristics of PVNS. Epidemiology and treatment are briefly discussed. Diffuse intraarticular PVNS, localized intraarticular PVNS, and localized extraarticular PVNS, also referred to as giant cell tumor of the tendon sheath, are discussed. PVNS is considered to be a benign neoplastic disorder. Joints, tendon sheaths, and bursae may be involved. The knee is the most common location of the intraarticular form. The characteristic MRI finding is low signal intensity synovial proliferation or mass with blooming from susceptibility artifact on gradient echo images, secondary to the presence of hemosiderin.

scholarly journals Imaging Features of Superficial and Deep Fibromatoses in the Adult Population

Sarcoma ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Eric A. Walker ◽  
Jonelle M. Petscavage ◽  
Pamela L. Brian ◽  
Chika Iloanusi Logie ◽  
Kenneth M. Montini ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Signal Intensity ◽  
Adult Population ◽  
Pulse Sequences ◽  
Biological Behavior ◽  
Imaging Features ◽  
Adult Type ◽  
Patient Demographics ◽  
Imaging Characteristics ◽  
Plantar Fibromatosis

The fibromatoses are a group of benign fibroblastic proliferations that vary from benign to intermediate in biological behavior. This article will discuss imaging characteristics and patient demographics of the adult type superficial (fascial) and deep (musculoaponeurotic) fibromatoses. The imaging appearance of these lesions can be characteristic (particularly when using magnetic resonance imaging). Palmar fibromatosis demonstrates multiple nodular or band-like soft tissue masses arising from the proximal palmar aponeurosis and extending along the subcutaneous tissues of the finger in parallel to the flexor tendons. T1 and T2-weighted signal intensity can vary from low (higher collagen) to intermediate (higher cellularity), similar to the other fibromatoses. Plantar fibromatosis manifests as superficial lesions along the deep plantar aponeurosis, which typically blend with the adjacent plantar musculature. Linear tails of extension (“fascial tail sign”) along the aponeurosis are frequent. Extraabdominal and abdominal wall fibromatosis often appear as a heterogeneous lesion with low signal intensity bands on all pulse sequences and linear fascial extensions (“fascial tail” sign) with MR imaging. Mesenteric fibromatosis usually demonstrates a soft tissue density on CT with radiating strands projecting into the adjacent mesenteric fat. When imaging is combined with patient demographics, a diagnosis can frequently be obtained.

The evaluation of lateral pterygoid signal intensity changes related to temporomandibular joint anterior disc displacement

2020 ◽  
Author(s):  
Damla Soydan Çabuk ◽  
Meryem Etöz ◽  
İbrahim Ethem Akgün ◽  
Serap Doğan ◽  
Eren Öztürk ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Signal Intensity ◽  
Disc Displacement ◽  
Anterior Disc Displacement ◽  
Intensity Changes
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