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Biomedical subjects

F Ozer

Publications and source records attributed to F Ozer.

28 records · Page 2Linked to original sources
PubMed1996

The principles of surgical management in dumbbell tumors.

OBJECTIVE: Tumors located in posterior mediastinum that extends into spinal canal via intervertebral foramen are called as Dumb-bell or Sand-glass tumors. Most of these tumors are neurogenic in origin but sometimes other rare tumors can also form in this shape. Herein three neurogenic tumors of the mediastinum that extended into the spinal canal are presented METHODS: In all patients that have been operated in our clinic during 1992-1993, we preferred one-stage removal described by Akwari that consists of posterior laminectomy by neurosurgical team to free the tumor within the spinal cord followed by a posterolateral thoracotomy and excision of the tumor by thoracic surgeons in the same setting. RESULTS: All three patients are alive and free of symptoms after 23, 16 and 13 months respectively. According to the pathological examinations of the specimens in the three patients, the exact diagnosis were reported as neurofibroma, paraganglioma and pheochromocytoma respectively. CONCLUSIONS: In recent reports, a combined surgical approach is recommended for dumb-bell neurogenic tumors in posterior mediastinum. We also recommend a combined and one stage removal of dumb-bell neurogenic tumors if possible. A team-work of thoracic and neurosurgeons will minimize the morbidity and mortality after the surgical procedure, as well as giving the opportunity to remove the tumor totally in one session.

Adolescent↗
PubMed1993

Extraspinal ependymoma presenting as a subcutaneous mass posterior to the sacrococcygeal region. Case report.

Ependymal cells may be found within the coccygeal ligament as well as in heterotopic positions and therefore ependymomas may rarely occur in extraspinal locations. Although the cauda equina is the most common location, less than 5% of all spinal ependymomas occur extradurally in the sacrococcygeal region. We report a case of extraspinal myxopapillary ependymoma arising in the subcutaneous soft tissue posterior to the sacrococcygeal region and review the relevant literature.

Adult↗
PubMed1992

Diagnostic value of sialic acid in malignant pleural effusions.

In this study, we measured pleural fluid and serum sialic acid levels in 70 consecutive patients hospitalized with pleural effusions and serum sialic acid concentrations in 20 healthy individuals chosen as control group. The cause of 26 pleural effusions was malignancy, and diseases other than malignant neoplasms were determined as the cause of 44 cases. Mean serum sialic acid levels in the patients with malignancies were higher than the levels in patients with nonmalignant diseases and the control group. Mean sialic acid level in the patients with nonmalignant diseases was increased compared with control group, but this increase was not as high as that in the patients with malignancies. In the patients with malignant neoplasms, mean pleural fluid sialic acid content was also higher than that found in other diseases. Sialic acid concentration of pleural fluid was correlated with serum concentration. However, pleural fluid to serum sialic acid ratio in malignant diseases was greater than that in the others. The specificity and sensitivity of pleural fluid sialic acid level in excess of 0.075 mg/ml in distinguishing malignant effusions were 68 percent and 77 percent, respectively. These values for pleural fluid/serum sialic acid ratio with the cut-off level of 0.7 were 55 percent and 65 percent. Our findings indicate that determination of sialic acid level in malignant pleural effusions has a diagnostic value.

Biomarkers, Tumor↗
PubMed1990

Malignant teratoma of the cerebellopontine angle: case report.

A case of malignant teratoma of the cerebellopontine angle is presented. Preoperative findings suggested an acoustic neurinoma or a meningioma. Particularly in adulthood, malignant teratomas arising in unusual locations can simulate common intracranial tumors.

Adult↗
PubMedDate not supplied

The effect of additional enamel etching and a flowable composite to the interfacial integrity of Class II adhesive composite restorations.

This in vitro study evaluated the interfacial integrity of Class II resin composite restorations. The influence of a flowable composite and additional enamel etching was also evaluated. Deep, saucer-shaped Class II cavities were prepared in the mesial and distal proximal surfaces of 25 extracted human molars and assigned to five treatment groups. The gingival margins were extended to approximately 1 mm above the CEJ in 40 cavities and below the CEJ in 10 cavities. The prepared cavities were then restored with a self-etching primer system (Clearfil Liner Bond II) and a hybrid resin composite (Clearfil AP-X), with and without a flowable composite (Protect Liner F) and additional enamel etching with 37% phosphoric acid gel (K-etchant). After finishing, polishing and thermocycling (4 and 60 degrees C, x300), the samples were longitudinally sectioned through the restorations and resin-tooth interfaces were observed directly under a laser scanning microscope. Statistical analysis indicated that the use of a flowable composite produced significantly more (p = 0.04) gap-free resin-dentin interfaces than teeth restored without the flowable composite. However, both flowable composite and enamel etching could not prevent gap formation at enamel-resin interfaces and crack formation on enamel walls.

Acid Etching, Dental↗
PubMedDate not supplied

Amalgam repair: evaluation of bond strength and microleakage.

This study evaluated the tensile bond strength of "repaired" amalgams and compared the degree of microleakage. Amalgam (Cavex avalloy) was condensed into plastic tubes (3 mm in diameter, 10 mm in height) to the half-length. After storage in water at 37 degrees C for two days, the remaining parts of tubes were filled with amalgam (A), cavity varnish (CV)+A, Liner Bond 2V (LB2V)+A, 3M Opal Luting Cement (3MOLC)+A, Panavia F(PF)+A, Metabond(MB)+A, Fuji BondLC(FB)+A, HytacOSB(HOSB)+Hytac Aplitip (H), Liner Bond2V+Clearfil AP-X(CAP). The bond strengths for 15 samples of each restoration group were determined. For the microleakage study, MOD cavities of 90 extracted human premolars were used. The distal half of cavities were filled with amalgam. After storage in water at 37 degrees C for two days, the mesial half of the cavities were filled to simulate a clinical repair. The "repair" was placed using the procedures applied in the bond strength study. The teeth were stained with basic fuchsine (0.5%), sectioned and evaluated for dye penetration. In both parts of study, the data were analyzed by ANOVA and Duncan's multiple range tests. Bond strength values (MPa) were: A+PF+A 3.84+/-1.08, A+LB2V+A 3.15+/-0.97, A+LB2V+CAP 3.05+/-0.53, A+MB+A 2.86+/-0.88, A+HOSB+H 2.58+/-0.51, A+3MOLC+A 2.11+/-0.75, A+FB+A 0.68+/-0.59. The repaired A+A and A+CV+A groups were separated before testing. The A+PF+A group showed the highest bond strength (p<0.05). Microleakage in the cervical margins of repaired restorations was lower in the amalgam groups than microleakage in the resin composite and compomer groups. PF, MB, 3MOLC and FB performed better at the amalgam "repair" interface. The A+LB2V+A group showed no microleakage at both the occlusal and gingival test regions.

Analysis of Variance↗
PubMedDate not supplied

Tracheopathia osteoplastica associated with iron deficiency anemia.

Tracheopathia osteoplastica (TPO) is a benign disease of trachea characterised by numerous cartilaginous or bony structures protruding into tracheobronchial lumen. We report a case of a 85-year-old male patient in whom tracheopathia osteoplastica was diagnosed incidentally during bronchoscopy which was missed on chest computed tomography examination. The patient also had iron deficiency anemia, the cause of which was not identified. We review TPO and discuss the associated abnormalities reported in the literature.

Aged↗