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Orbital Ct Scan

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https://www.readbyqxmd.com/read/30516663/gallbladder-metastasis-from-conjunctival-melanoma
#1
Thibaut Cassou-Mounat, Marie Luporsi, Virginie Huchet, Nina Jehanno
Malignant conjunctival melanoma is a rare tumor. A 46-year-old woman with a history of locally recurrent left conjunctival melanoma was followed by F-FDG PET/CT. Four years after the local recurrence treated by orbital exenteration, the follow-up PET/CT scan showed an incidental intense FDG uptake mass infiltrating the gallbladder associated with a low uptake of an infracentimetric pulmonary nodule. The patient was completely asymptomatic with no sign of local recurrence. Laparoscopic cholecystectomy was performed, and histopathologic findings were consistent with gallbladder metastasis of melanoma...
December 3, 2018: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/30515001/congenital-bilateral-anophthalmia-a-case-report-and-review-of-literature
#2
Meliha Halilbasic, Vahid Jusufovic, Zlatko Musanovic, Arnes Cabric
Introduction: Anophthalmia is congenital absence of the eyes; it may be unilateral or bilateral. Though rare, it occurs worldwide. It usually occurs in association with other systemic malformations. Case report: Therefore, the case of a female child delivered in University Clinic Center Tuzla is presented here with bilateral anophthalmia. The diagnosis was confirmed with an ocular computer tomography (CT) scan that showed under development of both globes within the orbit with a conclusion of bilateral anophthalmia...
October 2018: Medical Archives
https://www.readbyqxmd.com/read/30506174/performance-evaluation-of-a-new-high-sensitivity-time-of-flight-clinical-pet-ct-system
#3
Li Huo, Nan Li, Heyu Wu, Wenjia Zhu, Haiqun Xing, Jiantao Ba, Tong Wang, Fang Li, Hui Zhang
BACKGROUND: PoleStar m660 is a newly developed clinical PET/CT system with time-of-flight (TOF) capability. The aim of this study is to characterize the performance of the new system. Spatial resolution, sensitivity, scatter fraction, and noise equivalent count rate (NECR) were measured on the scanner according to the NEMA NU 2-2012 protocol. The timing resolution was measured using a rotating line source that orbited around the center of field of view (CFOV) at a radius of 20 cm. The image quality phantom was also imaged to quantify the percent contrast, percent background variability, and residual error...
December 1, 2018: EJNMMI Physics
https://www.readbyqxmd.com/read/30453400/-clinical-features-diagnosis-and-treatment-of-silent-sinus-syndrome
#4
Z X Wang, Y Y Lai, F H Chen, J B Shi, K J Zuo
Objective: To explore the clinical features, diagnostic methods and therapeutic strategy of silent sinus syndrome (SSS). Methods: A retrospective study was made on eight SSS patients treated during 2013-2016 in Longgang ENT Hospital and Otorhinolaryngology Hospital of the First Affiliated Hospital of SUN Yat-sen University. The following clinical data, including demographic data, symptoms, history of trauma and surgery, signs, imaging examination, endoscopic surgery and postoperative outcomes, were analyzed to summarize the diagnosis and treatment experiences...
November 7, 2018: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/30453103/finite-element-analysis-of-the-human-orbit-behavior-of-titanium-mesh-for-orbital-floor-reconstruction-in-case-of-trauma-recurrence
#5
J M Foletti, V Martinez, P Haen, Y Godio-Raboutet, L Guyot, L Thollon
INTRODUCTION: The Authors' main purpose was to simulate the behavior of a titanium mesh implant (TMI) used to reconstruct the orbital floor under the stress of a blunt trauma. MATERIALS AND METHODS: The orbital floor of a previously validated finite element model (FEM) of the human orbit was numerically fractured and reconstructed by a simplified TMI. Data from a CT scan of the head were computed with MICMICS (Materialise, Louvain, Belgium) software to re-create the skull's geometry...
November 16, 2018: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/30428870/recurrent-epibulbar-dermoid-cyst-treated-with-amniotic-membrane-implant-a-case-report
#6
Ma Luisa Villalón, Ma De Los Ángeles Leal, José R Chávez, Eduardo M Santillán, Ismael Lares-Asseff, Verónica Loera, Laura Valencia, Blanca Camacho, Brenda Alvarado, Vilma Cervantes, Leslie Patrón, Horacio Almanza
BACKGROUND: The dermoid cyst considered a cystic teratoma derived from embryonic germinal epithelium is a slow-growing benign tumour. Dermoid cysts may occur in the orbital and periorbital region in paediatric patients and are often recurrent. The surgical approach depends upon the site of the lesion, superficial or deep. To our knowledge, this is the first described case of a patient with resection of dermoid cyst treated with human amniotic membrane implant and topical application of 0...
November 14, 2018: BMC Surgery
https://www.readbyqxmd.com/read/30418935/a-head-coil-system-with-an-integrated-orbiting-transmission-point-source-mechanism-for-attenuation-correction-in-pet-mri
#7
A Renner, I Rausch, J Cal Gonzalez, R Frass-Kriegl, L Navarro de Lara, J Sieg, E Laistler, M Glanzer, D Dungl, E Moser, T Beyer, M Figl, W Birkfellner
The combination of positron emission tomography (PET) and magnetic resonance imaging (MRI) provides a benefit for diagnostic imaging. Still, attenuation correction (AC) is a challenge in PET/MRI compared to stand-alone PET and PET-computed tomography (PET/CT). In the absence of photonic transmission sources, AC in PET/MRI is usually based on retrospective segmentation of MR images or complex additional MR-sequences. However, most methods available today are still challenged by either the incorporation of cortical bone or substantial anatomical variations of subjects...
November 12, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/30415985/swollen-and-bloodshot-eye-following-headache
#8
Chia-Cheng Hsu, Shih-Hung Tsai, Jen-Chun Wang, Hung-Wen Kao, Chin-Wang Hsu, Wei-Hsiu Liu, Sy-Jou Chen
A ruptured cavernous carotid aneurysm (CCA) with carotid cavernous fistula can appear as a benign headache but progress to a swollen and bloodshot eye overnight. A 66-year-old woman visited emergency department with sudden onset of pain behind her left forehead and vomiting. She was treated for a migraine-like headache and discharged. She presented again on the next day with a persistent headache and a swollen left eye with blurred vision. An ophthalmologic examination revealed erythema of the left lid and chemosis at the temporal and lower bulbar conjunctiva...
November 7, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/30389113/orbit-zygoma-and-maxilla-growth-patterns-in-crouzon-syndrome
#9
X Lu, A J Forte, R Sawh-Martinez, R Wu, R Cabrejo, D M Steinbacher, M Alperovich, N Alonso, J A Persing
The facial malformations of Crouzon syndrome involve the entire cranio-orbito-zygomatic region. The detailed sequence of changes in orbit, zygoma, and maxilla over time, the mutual influence among these three anatomical structures, and their relationship with the cranial base were studied to determine the sequence and timing of deformity. Preoperative CT scans of 36 patients with Crouzon syndrome (mean age 10.84±14.70years; 14 male, 22 female) and CT scans of 54 control subjects (mean age 8.53±13.22years; 29 male, 25 female) were divided into five subgroups by age: 0-6 months, 6 months-2 years, 2-6 years, 6-18 years, and 18-62 years...
October 30, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/30387384/open-source-tools-for-dense-facial-tissue-depth-mapping-of-computed-tomography-models
#10
Terrie Simmons-Ehrhardt, Catyana Falsetti, Anthony B Falsetti, Christopher J Ehrhardt
Computed tomography (CT) scans provide anthropologists with a resource to generate three-dimensional (3D) digital skeletal material to expand quantification methods and build more standardized reference collections. The ability to visualize and manipulate the bone and skin of the face simultaneously in a 3D digital environment introduces a new way for forensic facial approximation practitioners to access and study the face. Craniofacial relationships can be quantified with landmarks or with surface-processing software that can quantify the geometric properties of the entire 3D facial surface...
January 2018: Human Biology
https://www.readbyqxmd.com/read/30361002/lateral-rectus-muscle-biopsy-as-diagnosis-of-unknown-metastatic-breast-cancer
#11
F Hernández Pardines, M C Serra Verdú, A Bernal Vidal, J M Mayol Belda, E Mengual Verdú
The case concerns a 58 year-old female with no medical history of interest who consulted due to binocular diplopia of one week onset. It was associated with costal pain, dyspnoea, intense asthenia and weight loss of 2 months onset. In the blood analysis in the Emergency Department it showed hypercalcaemia, renal failure, and bicytopenia. The chest x-ray showed lytic bone lesions that initially lead to multiple myeloma with extra-osseous involvement. In addition to the corresponding study, in case of horizontal diplopia, a cranial CT scan without contrast was performed where an adjacent lesion to the lateral wall of the left orbit is observed...
October 22, 2018: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/30344878/-imaging-of-orbital-cellulitis-in-children-about-56-cases
#12
Dounia Basraoui, Ayoub Elhajjami, Hicham Jalal
Orbital cellulitis is rare but potentially severe in children. Diagnosis is primarily based on clinical examination and imaging (CT or MRI). This study aims to highlight the role of imaging, in particular CT scan, in the diagnosis and in the treatment of this pathology. We conducted a retrospective study of 56 cases of orbital cellulitis, whose data were collected in the Department of Radiology at the Hospital mother and child CHU Mohamed VI, Marrakech over a period of six years (January 2011-October 2017)...
2018: Pan African Medical Journal
https://www.readbyqxmd.com/read/30340612/improving-3d-printing-of-megavoltage-x-rays-radiotherapy-bolus-with-surface-scanner
#13
Giovanna Dipasquale, Alexis Poirier, Yannick Sprunger, Johannes Wilhelmus Edmond Uiterwijk, Raymond Miralbell
BACKGROUND: Computed tomography (CT) data used for patient radiotherapy planning can nowadays be used to create 3D-printed boluses. Nevertheless, this methodology requires a second CT scan and planning process when immobilization masks are used in order to fit the bolus under it for treatment. This study investigates the use of a high-grade surface-scanner to produce, prior to the planning CT scan, a 3D-printed bolus in order to increase the workflow efficiency, improve treatment quality and avoid extra radiation dose to the patient...
October 19, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/30337164/anterior-convex-lateral-orbital-wall-distinctive-morphology-in-apert-syndrome
#14
X Lu, A J Forte, R Sawh-Martinez, R Wu, R Cabrejo, D M Steinbacher, M Alperovich, N Alonso, J A Persing
Bony malformations of the orbit and alterations to the soft tissue in Apert syndrome contribute to ophthalmic dysfunction. Recognised structural malformation of the sphenoid and ethmoid sinuses, together with corresponding deformities in the anterior and middle cranial base, are characteristic. Our aim was to explore the underlying structural components of disfigurement and the consequent development of the orbit in patients with Apert syndrome over time by studying 18 preoperative computed tomographic (CT) scans of affected patients and 36 scans from controls...
October 15, 2018: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/30335562/anatomic-variation-of-the-entrance-of-the-optic-canal-into-the-orbit
#15
Shoaib Ugradar, Robert Goldberg, Daniel Rootman
PURPOSE: To characterise variations in the location of the optic canal and its entry into the orbit in relation to the sphenoid sinus. METHODS: In this observational study, patients with high-resolution computed tomography (CT) scans seen by 2 specialists (RG and DR) over a period of 12 years were reviewed for study entry. The primary outcome measure was characterisation of the optic canal route in relation to the sphenoid sinus and the location of its opening within the orbit...
October 18, 2018: Orbit
https://www.readbyqxmd.com/read/30326441/targeted-nanoparticle-binding-detection-in-petroleum-hydrocarbon-impacted-porous-media
#16
Stuart Linley, Andrew Holmes, Timothy Leshuk, Wanis Nafo, Neil R Thomson, Adil Al-Mayah, Kevin McVey, Kanwartej Sra, Frank X Gu
Targeted nanoparticle binding has become a core feature of experimental pharmaceutical product design which enables more efficient payload delivery and enhances medical imaging by accumulating nanoparticles in specific tissues. Environmental remediation and geophysical monitoring encounter similar challenges which may be addressed in part by the adoption of targeted nanoparticle binding strategies. This study illustrates that engineered nanoparticles can bind to crude oil-impacted silica sand, a selective adsorption driven by active targeting based on an amphiphilic polymer coating...
January 2019: Chemosphere
https://www.readbyqxmd.com/read/30319827/occult-orbital-injury-with-dagger-fragment-with-resulting-pneumocephalus
#17
Lucía Jáñez-García, Enrique Mencía-Gutiérrez, Esperanza Gutiérrez-Díaz, Luis F Moreno-García-Rubio, Laura Zarratea-Herreros, Álvaro Bengoa-González, Silvia Pérez-Trigo
Penetrating injuries of the cranium are relatively uncommon, only 0.4% of all head injuries. In patients with disturbed conscious level, an extensive examination should be performed in the emergency unit to rule out transorbital penetrating brain injury. A 25-year-old male was attacked with a dagger. He presented with ethylic intoxication and the physical examination demonstrated a small skin injury on the lateral canthus of the left eye with a large periocular hematoma which prevented eyelid opening. Cranial CT scan showed a metallic intraorbital foreign body consisting of a fragment of a dagger which perforated the eyeball, and penetrated through the superomedial wall of the orbit into the anterior cranial fossa...
2018: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/30310843/application-of-three-dimensional-printing-technology-in-orbital-floor-fracture-reconstruction
#18
Sherby Suet Ying Pang, Christian Fang, Jimmy Yu Wai Chan
Importance: Orbital floor fracture is common among patients suffering from facial trauma. Open reduction and reconstruction of the orbital floor with Medpor is the treatment of choice in our centre to correct diplopia and enophthalmos. Objective: Application of locally available 3D printing service in perioperative planning of orbital floor reconstruction with porous polyethylene. Design: We present two patients who suffered from orbital floor fracture complicated by diplopia...
October 2018: Trauma case reports
https://www.readbyqxmd.com/read/30289825/low-flow-orbital-venous-malformation-masquerading-as-rhabdomyosarcoma
#19
Saagar A Pandit, Kyle J Godfrey, Kristen E Dunbar, Ashley A Campbell, Michael Kazim
A 15-month-old male was referred for biopsy of presumed rhabdomyosarcoma in the setting of rapidly progressing left-sided proptosis. Examination revealed left periorbital edema and left hypoglobus. MRI revealed a soft-tissue density mass within the left lateral retrobulbar space. Several days later, he developed acute periorbital ecchymosis and increasing edema. With high suspicion for a vascular lesion, a CT scan was performed with dynamic arterial and venous imaging. Central filling was noted in the lateral retrobulbar component with increased enhancement on delayed venous imaging in the middle cranial fossa component favoring the diagnosis of a low-flow orbital venous malformation...
September 27, 2018: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/30287407/development-and-validation-of-an-optimized-finite-element-model-of-the-human-orbit
#20
J M Foletti, V Martinez, N Graillon, Y Godio-Raboutet, L Thollon, L Guyot
INTRODUCTION: The authors' main purpose was to develop a detailed finite element model (FEM) of the human orbit and to validate it by analyzing its behavior under the stress of blunt traumas. MATERIALS AND METHODS: A pre-existing 3D FEM of a human head was modified and used in this study. Modifications took into account preliminary research carried out on PubMed database. Data from a CT scan of the head were computed with Mimics® software to re-create the skull geometry...
October 1, 2018: Journal of Stomatology, Oral and Maxillofacial Surgery
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