silicon and Foreign-Bodies

Foreign bodies of the urinary tract represent a urologic emergency. First-line treatment is endoscopic removal, but this is often impeded by restricted space, especially in the urethra. We postulated that foreign objects could be fragmented by Holmium:YAG laser and investigated its effect on objects of varying composition.. In a specially designed stage flushed with physiologic saline, medical and non-medical objects of differing composition and diameter were subjected to fragmentation by Holmium:YAG at powers of 18 and 30 W. In additional thermal experiments, 5,000 J was applied to differing volumes of 0.9% sodium chloride. Experiments were repeated ten times.. With one exception (16 Ch silicon catheter) all medical objects were fragmented (latex urinary catheter, ureteral stents, and guidewires). Of non-medical objects (wood, steel, copper, graphite, and nylon) only copper wire was not amenable to laser dissection. These in vitro results were applied in two patients who presented with a pencil (wood and graphite) in the urethra or bladder. After Holmium:YAG laser fragmentation, the pencil could be removed by forceps each.. Foreign objects in the urinary tract can be fragmented with a Holmium:YAG laser. When foreign bodies are too big for initial endoscopic extraction, the clinician should consider this technique as a reasonable and atraumatic option to avoid open surgery.

Topics: Aged; Catheterization; Erectile Dysfunction; Foreign Bodies; Graphite; Hot Temperature; Humans; In Vitro Techniques; Laser Therapy; Lasers, Solid-State; Male; Middle Aged; Nylons; Self Care; Silicon; Steel; Stents; Urinary Tract Infections; Wood

A male rhesus macaque with a cephalic chamber implant for neurophysiology recording presented with hemiparesis affecting the left thoracic and pelvic limbs at approximately 5 wk after craniotomy surgery. MRI indicated a 1×2-cm ovoid cerebrocortical cystic lesion immediately subjacent to the right hemisphere craniotomy and recording chamber. Transdural aspiration of sterile transudate and resultant decompression resolved the hemiparesis, and follow-up MRI at 1 mo indicated resolution of the lesion. Subsequently, necropsy at study end revealed a cerebrocortical foreign body composed of silicon. The atypically slow cure rate of the lot of silicon used and the unique recording chamber configuration were underlying factors that contributed to the formation of this foreign body. To our knowledge, this report is the first description of iatrogenic intracerebral foreign body in a macaque.

Topics: Animals; Cerebrum; Craniotomy; Foreign Bodies; Macaca mulatta; Male; Postoperative Complications; Prostheses and Implants; Silicon

Peri-implantitis is an inflammatory condition that can lead to implant loss. The aim of this descriptive retrospective study is to describe the histopathologic findings in soft tissue biopsies of implants with peri-implantitis.. Thirty-six human peri-implantitis biopsies were analyzed using light microscopy (LM) and scanning electron microscopy (SEM). The composition of foreign materials found in the tissues was assessed using an energy dispersive x-ray spectrometer.. At the LM level, the inflammatory lesion of peri-implantitis was in most cases a mixture of subacute and chronic inflammation dominated by plasma cells. At the SEM level, radiopaque foreign bodies were identified in 34 of the 36 biopsies. The predominant foreign bodies found were titanium and dental cement. These foreign materials were surrounded by inflammatory cells.. At present, the exact mechanism for introduction of these materials and their role in peri-implantitis is unknown. Further research is warranted to determine their etiology and potential role in pathogenesis.

Topics: Aluminum; Alveolar Bone Loss; Biopsy; Dental Cements; Epithelial Cells; Foreign Bodies; Giant Cells, Foreign-Body; Humans; Microscopy, Electron, Scanning; Peri-Implantitis; Periodontal Abscess; Periodontal Index; Periodontal Pocket; Periodontium; Plasma Cells; Retrospective Studies; Silicon; Spectrometry, X-Ray Emission; Titanium; Zirconium

Foreign bodies inserted through the urethra are often found in the urinary bladder. We presently report the first case of hydronephrosis and hydroureter due to direct compression in the urinary bladder by silicon, which had been introduced by the patient himself 2 yr prior to presentation with severe right flank pain. Computed tomography indicated a convoluted, high-attenuation mass in the urinary bladder; unilateral hydronephrosis and hydroureter were also present due to direct compression by the mass. The foreign body was removed using a cystoscope. This foreign body was proven to be silicon.

Topics: Adult; Cystoscopy; Foreign Bodies; Humans; Hydronephrosis; Male; Silicon; Tomography, X-Ray Computed; Urinary Bladder

Zinc eluted from siliconized latex (SL) increases resistance of Pseudomonas aeruginosa to imipenem in vitro. A foreign body peritonitis model was used to evaluate the activity of imipenem using SL or silicone (S) implants. No differences were observed in mortality, positive blood cultures and tissue bacterial counts between SL and S implants. Implant-associated counts, however, were significantly higher in the SL group. It is concluded that SL decreases the activity of imipenem against P. aeruginosa.

Topics: Animals; Anti-Bacterial Agents; Bacterial Load; Catheters; Disease Models, Animal; Drug Antagonism; Female; Foreign Bodies; Imipenem; Latex; Liver; Mice; Mice, Inbred C57BL; Peritonitis; Pseudomonas aeruginosa; Pseudomonas Infections; Silicon; Spleen; Treatment Outcome; Zinc

Polarizing microscopy (PM), scanning electron microscopy (SEM), x-ray dispersive analysis (EDAX), x-ray diffraction (XRD), and infrared spectrometry (IR) were used to study the following pathological mineralizations: calcifications and silicon(Si)-bearing mineralizations in cerebral tissue from an epileptic child; traces of Si-bearing particles in periprosthesic mammarian tissue, and calcifications in capsular mammarian tissue from a patient with a silicone gel mammarian implant, and 2 calcium-bearing compounds, a typical apatitic calcification, and a nonphosphorous-bearing calcification in arterial tissues. In this tissue we also found Si-bearing particles due to an artifact from glassware.

Topics: Aged; Apatites; Arteries; Artifacts; Brain Diseases; Breast; Breast Diseases; Breast Implants; Cadaver; Calcinosis; Child; Electron Probe Microanalysis; Epilepsy; Female; Foreign Bodies; Glass; Humans; Lymph Nodes; Microscopy, Electron, Scanning; Microscopy, Polarization; Middle Aged; Prostheses and Implants; Silicon; Silicone Gels; Spectrophotometry, Infrared; Vascular Diseases; X-Ray Diffraction

Experimental and clinical evaluation of a digital flat-panel X-ray system based on cesium iodide (CsI) and amorphous silicon (a-Si).. Performance of a prototype detector was compared with conventional screen-film radiography (SFR) using several phantom studies. Foreign bodies, fractures, osteolyses, and pulmonary lesions were analyzed. Additionally, 120 patients were studied prospectively, resulting in 400 comparative X-ray studies. The flat-panel detector was exposed with standard dose and with a dose reduction of up to 75%. Detector size was 15 x 15 cm, pixel matrix was 1 x 1 k with a pixel size of 143 microns. Modulation-transfer function was determined to be 18% at the maximum spatial resolution of 3.5 lp/mm.. The diagnostic results achieved with the digital detector were similar to those of conventional SFR, even at reduced radiation exposure. A potential for dose reduction was observed: 50% with respect to osteoarthrosis and fractures, and 75% for determining bony alignment.. This new technology can be used in thoracic and skeletal radiography. A significant dose reduction is possible, depending on the suspected disease.

Topics: Animals; Bone Diseases; Cesium; Foreign Bodies; Humans; Iodides; Lung Diseases; Phantoms, Imaging; Radiation Dosage; Radiographic Image Enhancement; Silicon; Swine; X-Ray Intensifying Screens

We describe 2 patients with foreign body synovitis simulating acute septic arthritis. One patient was an 11-year-old boy who developed acute knee swelling due to a penetrating fragment of wood. The other patient was an intravenvous drug abuser in whom silicon was identified in synovial fluid and synovial membrane and whose arthritis improved after complete synovectomy.

Topics: Acute Disease; Adult; Arthritis, Infectious; Child; Diagnosis, Differential; Elbow Joint; Foreign Bodies; Foreign-Body Reaction; Humans; Knee Joint; Male; Silicon; Wood

A 42-year-old man developed a papulonodular exanthema 10 years following an injury from a shell explosion. The differential diagnosis between sarcoid-like, foreign-body granulomas and Boeck's sarcoid was inconclusive by histology, but x-ray spectroanalytic examination revealed silicon particles within the epitheloid cell granulomas.

Topics: Adult; Diagnosis, Differential; Foreign Bodies; Granuloma; Humans; Male; Sarcoidosis; Silicon

Topics: Foreign Bodies; Humans; Male; Middle Aged; Periapical Tissue; Radiography; Silicon

Topics: Dermatitis, Occupational; Foreign Bodies; Granuloma; Humans; Male; Silicon; Silicones

Topics: Animals; Dogs; Foreign Bodies; Leg; Muscles; Prostheses and Implants; Silicon

Topics: Aged; Capsules; Cecal Neoplasms; Foreign Bodies; Humans; Male; Meckel Diverticulum; Silicon