scholarly journals Unusual Presentation of Popliteal Cyst on Magnetic Resonance Imaging

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Tsuyoshi Ohishi ◽  
Masaaki Takahashi ◽  
Daisuke Suzuki ◽  
Yukihiro Matsuyama
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Final Diagnosis ◽  
Magnetic Resonance Images ◽  
Popliteal Cyst ◽  
High Signal ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
T2 Weighted Images

Popliteal cyst commonly presents as an ellipsoid mass with uniform low signal intensity on T1-weighted magnetic resonance images and high signal intensity on T2-weighted images. Here, we describe a popliteal cyst with unusual appearance on magnetic resonance imaging, including heterogeneous intermediate signal intensity on T2-weighted images. Arthroscopic cyst decompression revealed that the cyst was filled with necrotic synovial villi, indicative of rheumatoid arthritis. Arthroscopic enlargement of unidirectional valvular slits with synovectomy was useful for the final diagnosis and treatment.

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).

scholarly journals Magnetic resonance imaging of the normal dromedary camel tarsus

2020 ◽  
Author(s):  
Usama Hagag ◽  
Zakriya Ali Almohamad ◽  
Mohamed Gomaa Tawfiek ◽  
Ayman El Nahas
Keyword(s):  
Magnetic Resonance Imaging ◽  
Articular Cartilage ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
High Signal ◽  
Proton Density ◽  
Dromedary Camel ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Tarsal Bones

Abstract Background: Magnetic resonance imaging (MRI) is the most versatile and informative imaging modality for the diagnosis of locomotor injuries in many animal species; however, veterinary literature describing the MRI of the dromedary camel tarsus is lacking. Our purpose was to describe and compare the MRI images of twelve cadaveric tarsi, examined in a 1.5 Tesla MRI scanner, with their corresponding anatomical gross sections. Turbo spin-echo (TSE) T1-weighted (T1), T2-weighted (T2), proton density-weighted (PD), and short tau inversion recovery (STIR) sequences were obtained in 3 planes. Tarsi were sectioned in sagittal, dorsal, and transverse planes. MRI images from different sequences and planes were described and compared with the anatomical sections.Results: The soft and osseous tissues of the dromedary camel tarsus corresponded extensively with the gross anatomic sections. T1 and PD images provided high anatomical details and the synovial fluid had high signal intensity on T2, PD, and STIR sequences and intermediate signal intensity on T1 images. The tibial cochlea, tarsal bones, and the proximal metatarsus were evaluated in all planes. The sagittal and dorsal images were useful for the evaluation of articular cartilage and subchondral bone. Articular cartilage had homogenous intermediate signal intensity on the T1 images and low signal intensity on the T2 and PD images. The Subchondral and cortical bone had low signal intensity on all sequences, and the cancellous bone expressed heterogeneous signal intensity on PD, T1, and T2 images. The tarsal tendons and ligaments had low signal intensity in all sequences including: the tendons of fibularis tertius, long digital extensor, cranial tibial, fibularis longus, lateral digital extensor muscles; the common tendon of the caudal tibial and lateral digital flexor muscles; the medial digital flexor tendon; the long and short bundles of the medial and lateral collateral ligaments; the superficial and deep digital flexor tendons; and the long plantar ligament. Conclusions: MRI images provided a thorough evaluation of the normal dromedary camel tarsus. Information provided in the current study is expected to serve as a basis for interpretation in clinical situations.

scholarly journals Magnetic resonance imaging of the normal dromedary camel tarsus

2020 ◽  
Author(s):  
Usama Hagag ◽  
Zakriya Ali Almohamad ◽  
Mohamed Gomaa Tawfiek ◽  
Ayman El Nahas
Keyword(s):  
Magnetic Resonance Imaging ◽  
Articular Cartilage ◽  
Magnetic Resonance ◽  
Soft Tissue ◽  
Synovial Fluid ◽  
Signal Intensity ◽  
High Signal ◽  
Dromedary Camel ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity

Abstract Background The role of magnetic resonance imaging (MRI) in veterinary practice continues to grow. MRI is currently the most versatile and informative imaging modality for diagnosis of soft tissue injuries in many animal species; however, veterinary literature describing the MRI of the dromedary camel tarsus is lacking. Our purpose was to describe and compare the MRI images of twelve cadaveric tarsi, examined in 1.5 T MRI scanner, with their corresponding anatomical gross sections. Turbo spin-echo (TSE) T1-weighted (T1), T2-weighted (T2), proton density-weighted (PD) and short tau inversion recovery (STIR) sequences were obtained in 3 planes. Tarsi were sectioned into sagittal, dorsal and transverse planes. Relevant osseous and soft tissue structures on MRI images and corresponding cryosections were identified and labeled. Results The overall quality of MRI images was adequate and informative. The soft and osseous tissues of the dromedary camel tarsus corresponded well with the gross anatomic sections. The sagittal and dorsal images were the most valuable for evaluation of articular cartilage and subchondral bone. T1 and PD sequences provided high anatomical details. T2 and STIR images were valuable for evaluation of synovial fluid. Articular cartilage had homogenous intermediate signal intensity. Subchondral and cortical bone had low signal intensity and cancellous bone had heterogeneous signal intensity. Tendons and ligaments had low signal intensity. Synovial fluid had high signal intensity on T2, PD and STIR sequences and intermediate signal intensity on T1 images. Conclusions MRI images provided a thorough evaluation of the normal dromedary camel tarsus. Information provided in the current study is anticipated to serve as a basis for interpretation in clinical situations.

scholarly journals Hepatic epithelioid hemangioendothelioma: a report from three university centers

2016 ◽  
Vol 49 (5) ◽  
pp. 288-294 ◽  
Author(s):  
Antonello Giardino ◽  
Frank H. Miller ◽  
Bobby Kalb ◽  
Miguel Ramalho ◽  
Diego R. Martin ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Epithelioid Hemangioendothelioma ◽  
Magnetic Resonance Images ◽  
Central Core ◽  
Magnetic Resonance Imaging Examination ◽  
High Signal ◽  
Resonance Imaging ◽  
Peripheral Ring ◽  
Venous Phase

Abstract Objective: To determine common imaging findings of hepatic epithelioid hemangioendothelioma on magnetic resonance images. Materials and Methods: A search was made of three institutional databases between January 2000 and August 2012. Seven patients (mean age, 47 years; range, 21-66 years; 6 women) with pathology-confirmed diagnosis of hepatic epithelioid hemangioendothelioma who had undergone magnetic resonance imaging were identified. None of the patients had received any treatment for hepatic epithelioid hemangioendothelioma at the time of the initial magnetic resonance imaging examination. Results: Hepatic epithelioid hemangioendothelioma tumors appeared as focal masses in 7/7 patients, greater than 5 in number, with a coalescing lesion in 1/5, and peripheral localization in 6/7. Capsular retraction was present in 4/7, and was associated with peripherally located lesions. Early ring enhancement was appreciated in the majority of lesions in 7/7 patients. Centripetal progressive enhancement was shown in 5/7 patients on venous phase that exhibited a distinctive thick inner border of low signal on venous phase images, and a central core of delayed enhancement. Small lesions did not show this. Conclusion: The combination of multifocal round-configuration lesions that are predominantly peripheral and exhibit early peripheral ring enhancement and late appearance of an inner thick border of low signal and central core of high signal may represent an important feature for hepatic epithelioid hemangioendothelioma.

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 Visualisation of fetal meconium on post-mortem magnetic resonance imaging scans: a retrospective observational study

2020 ◽  
Vol 9 (11) ◽  
pp. 205846012097054
Author(s):  
Georgia Hyde ◽  
Andrew Fry ◽  
Ashok Raghavan ◽  
Elspeth Whitby
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Interrater Reliability ◽  
Hepatic Flexure ◽  
Radiology Department ◽  
High Signal ◽  
Post Mortem ◽  
Resonance Imaging ◽  
Tertiary Referral Centre

Background Less invasive techniques for fetal post-mortems are increasingly used to correlate with parental wishes. With the use of post-mortem magnetic resonance imaging (MRI), normal appearance of the organs must be established. Purpose To investigate the after death appearance of the fetal meconium throughout gestation using the hyperintense appearance of meconium on T1 weighted MRI. Material and Methods This was a retrospective study that took place in a tertiary referral centre radiology department. Sixty-two fetal body post-mortem MRI scans (January 2014 to May 2018) between 12 and 41 weeks gestation were reviewed. Signal intensity of meconium at the rectum, sigmoid colon, splenic flexure and hepatic flexure was evaluated and correlated with gestational age. Interrater reliability was calculated. Results Meconium did not consistently have high signal intensity on T1 scans and was not always obvious. Rectal meconium had the highest intensity, and the more proximal the bowel the lower the intensity. The meconium had higher intensity at earlier gestations. Interrater reliability for rectal meconium gradings was excellent. Conclusion This study provides the first published primary research on the appearance of fetal meconium on post-mortem MRI. Overall, results were variable and suggest an alteration of bowel contents after death, but further investigation is needed to effectively inform practice.

Lysability of arterial thrombi assessed by magnetic resonance imaging

VASA ◽  
2005 ◽  
Vol 34 (4) ◽  
pp. 262-265 ◽  
Author(s):  
Kozak ◽  
Mikac ◽  
Blinc ◽  
Sersa
Keyword(s):  
Magnetic Resonance ◽  
Signal Intensity ◽  
Magnetic Resonance Images ◽  
High Signal ◽  
Resonance Imaging ◽  
Gradient Echo ◽  
Catheter Directed Thrombolysis ◽  
Improve Patient Selection ◽  
Selection For ◽  
Improve Patient

Background: Intravascular thrombi change in time due to retraction and organization, which is reflected in the appearance of magnetic resonance images of clots. We have hypothesized that MRI has the potential to improve patient selection for thrombolytic treatment. The aim of our study was to analyze occlusive arterial thrombi with MRI, and to correlate the MRI parameters with the therapeutic outcome in patients with occlusive atherothrombotic disease of the superficial femoral artery who were treated with catheter-directed thrombolysis by streptokinase. Patients and methods: We included 13 patients with subacute (2 weeks to 3 months old) occlusive arterial thrombi and 4 patients with chronic (more than 6 months old) arterial occlusions. We measured the MRI signal intensity on gradient echo images of 98 axial slices of the subacute occlusive thrombi and in 45 slices of 4 chronic thrombi. Following MRI, the patients with subacute history were treated with catheter-directed thrombolysis. Results: Thrombolysis was successful in 11/13 patients. The normalized MRI signal intensity was significantly higher in the unsuccessfully treated thrombi than in the successfully treated thrombi (1.10 ± 0.08 vs. 0.72 ± 0.17, p < 0.003), but the subacute and chronic thrombi did not differ in signal intensity. Conclusions: High signal intensity of arterial thrombi on gradient echo MRI might predict resistance to thrombolytic therapy.

Magnetic Resonance Imaging and Cervical Spondylotic Myelopathy

Neurosurgery ◽  
1990 ◽  
Vol 26 (2) ◽  
pp. 217-227 ◽  
Author(s):  
Thomas F. Mehalic ◽  
Roger T. Pezzuti ◽  
Brett I. Applebaum
Keyword(s):  
Magnetic Resonance Imaging ◽  
Spinal Cord ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Cervical Spondylotic Myelopathy ◽  
Pathological Condition ◽  
Prognostic Significance ◽  
Resonance Imaging ◽  
T2 Weighted Images

Abstract Nineteen patients were examined for cervical spondylotic myelopathy with magnetic resonance imaging. Pre- and postoperative magnetic resonance scans were obtained in most cases. Surgical confirmation of the pathological condition was obtained for all 19 patients. On the T2-weighted scans, there was increased signal intensity within the spinal cord at the point of maximal compression. The exact cause of the increased signal intensity on the T2-weighted images is not known, but is suspected to represent edema, inflammation, vascular ischemia, myelomalacia, or gliosis. The increased signal intensity diminished postoperatively in the patients who improved clinically, and remained the same or increased in those whose conditions remained unchanged or worsened after decompression. The authors suggest that these T2-weighted images carry prognostic significance.

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