How can we use positron emission tomography/computed tomography more accurately for characterization of asbestos-related pleural thickening?

Introduction: There is no consensus about the standardized uptake value maximum (SUVmax) cut-off value to characterize pleural thickening worldwide. Sometimes, this causes unnecessary invasive diagnostic procedures. Our first aim is to determine a cut-off value for SUVmax. Secondly, we try to answer the following question: If we use this cut-off value together with morphological parameters, can we differentiate benign thickening from malignant pleural mesothelioma (MPM) more accurately? Material and methods: Thirty-seven patients who underwent 2-deoxy-2-fluoro-D-glucose ([18F]FDG) positron emission tomography/computed tomography (PET/CT) before pleural biopsy were included the study. All of patients had histopathologically proven primary pleural disease. Their [18F]FDG-PET/CT imaging reports were re-assessed. If a patient's SUVmax or size of the thickening was not mentioned in the report, we calculated it with their [18F]FDG-PET/CT. Results: Age, pleural effusion, size, and SUVmax were found to have a relationship with MPM. We found the size > 14 mm, and SUVmax > 4.0 as cut-off values for MPM. The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for size > 14 mm were found to be 86.4%, 85.2%, 82.6%, 88.5%, respectively. For SUVmax > 4.0, sensitivity, specificity, PPV, NPV were 90.9%, 87.0%, 85.1%, 92.2%, respectively. Conclusions: If a patient has SUVmax > 4.0 and/or size > 14 mm, the risk of MPM is high. These patients should undergo biopsy. If a patient's SUVmax < 4.0, size < 14 mm and does not have pleural effusion, he/she has low risk for MPM. These patients can undergo the follow-up. If a patient's SUVmax < 4, size < 14, and has pleural effusion the MPM risk is approximately 4%. These patients can undergo biopsy/cytology/follow-up. Novel studies are needed for these patients.

Carbon monoxide-induced cortical visual loss: treatment with hyperbaric oxygen four years later.

OBJECTIVE: We present a patient who developed visual loss after carbon monoxide (CO) poisoning and was treated with hyperbaric oxygen. CLINICAL PRESENTATION AND INTERVENTION: A 21-year-old woman poisoned with CO (with coma lasting 4 h and carboxyhemoglobin level 46%) developed seizures and cortical blindness 3 days after poisoning. Four years later, her visual acuity was 0.2 in both eyes. An (18)F-fluorodeoxyglucose positron emission tomography (PET) scan showed reduced metabolism in the bilateral posterior temporal and occipital lobes. The patient received a total of 50 hyperbaric oxygen sessions over 3 months for visual loss and the visual acuity improved to 0.5 in both eyes. In addition, increased metabolism was detected in the brain in post-treatment PET scans. CONCLUSION: PET documented brain hypoperfusion 4 years after CO poisoning and hyperbaric oxygen therapy improved visual acuity. However, we cannot endorse routine use of hyperbaric oxygen for such patients, until results of further clinical trials demonstrate efficacy of hyperbaric oxygen in CO-induced chronic brain injury.

[Use of double flaps in high-voltage electrical injury of scalp and calvaria: case report]. / Saçli deri ve kalvaryumun yüksek voltajli elektrik yaralanmasinda çift flep kullanimi: Olgu sunumu.

A 15-year-old boy sustained a high-voltage electrical injury with full-thickness scalp and calvarial bone necrosis in the parieto-occipital region. While necrotic soft tissues were debrided on the fifth day of injury, the devitalized calvaria was preserved. Bilayered coverage of the necrotic bone was achieved by transposition of 'bipedicled pericranial flap' and 'bipedicled scalp flap'. No complication was observed in the postoperative period. A bone resorption area, smaller than the original necrotic bone area, was observed in the long-term follow-ups.

Can we differentiate malignant peripheral nerve sheath tumor from benign neurofibroma without invasive sampling.

One of the most important benign tumors in neurofibromatosis type 1 (NF1) is plexiform neurofibroma, and there is a risk of developing malignant peripheral nerve sheath tumor (MPNST) throughout life approximately 10%. However lesion characterization by anatomical imaging methods are not possible. Because of that most of cases goes to biopsy. Using of fluorodeoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) for lesion characterization can be helpful in NF1 patients. We aimed to present an example of the efficacy of FDG-PET/CT in distinguishing benign neurofibroma from MPNST. A 6-year-old male patient who had NF1 admitted to emergency service due to high fever. Acute upper respiratory tract infection was diagnosed; antipyretic and abundant fluid intake was suggested. When high fever continued, the patient referred to our hospital on detection of axillary lymphadenopathy. Leukocytosis was detected in patient's blood count. Sedimentation was 54 mm/h, C-reactive protein 166 g/L, and lactate dehydrogenase 276U/L. Blood and throat cultures did not show pathogenic bacteria. In serological tests, VZV-IgG, EBV-VCA-IgG, and CMV-IgG were avidite positive; Hepatitis B Ag, Anti-HIV, Anti-HAV IgG and IgM, Anti-HCV, EBV-VCA IgM, and VZV-IgM were negative. Based on these results, cervical and thoracic contrast-enhanced computed tomography was performed on preliminary diagnosis of MPNST. Solid lesions with rounded margins, large one being 49 mm in size, that extend from superior mediastinum to posterior mediastinum, left axillary region, and left part of neck were detected, and they were surrounding the vascular structures. Since neurofibroma, MPNST, and lymphoma could not be distinguished, patient referred to FDG-PET/CT scanning. In FDG-PET/CT, highest lesion maximum standardized uptake value (SUVmax) was 1.5; SUVmax lesion/SUVmax liver 1.0, and SUVmax/ SUV mean liver 1.5. Biopsy from mediastinal and axillary region did not have LN structure and was positive for S-100 immunostaining, and patient was diagnosed as benign neurofibroma. We believe that there is no need for biopsy in lesions considered benign based on FDG-PET/CT parameters.

Scintigraphic evaluation of early osteoblastic activity in extraction sockets treated with platelet-rich plasma.

PURPOSE: The aim of this study was to investigate the early effect of platelet-rich plasma (PRP) on osteoblastic activity during the healing process of soft tissue impacted mandibular third molar extraction sockets by means of bone scintigraphy. PATIENTS AND METHODS: Twelve patients with bilaterally soft tissue impacted mandibular third molars were included in the study. The impacted right and left mandibular third molars were surgically extracted in the same session. PRP was administered randomly into the extraction sockets in the study (S) group whereas the extraction sockets in the control (C) group were left without PRP treatment. Scintigrams were obtained in the first and fourth weeks after surgery to evaluate the osteoblastic activity within extraction sockets in both groups. RESULTS: Scintigraphic findings of postoperative first and fourth weeks did not show significantly increased osteoblastic activity between S group and C group (P > .05). However, the osteoblastic activity in both groups significantly increased in postoperative week 4 in comparison to week 1 (P < .05). CONCLUSION: The application of PRP alone into soft tissue impacted mandibular third molar extraction sockets failed to increase the osteoblastic activity in postsurgical weeks 1 and 4 in comparison to non-PRP-treated sockets.

Breast cancer in association with thyroid disorders.

BACKGROUND: The relationship between breast cancer and thyroid diseases is controversial. Discrepant results have been reported in the literature. The incidences of autoimmune and nonautoimmune thyroid diseases were investigated in patients with breast cancer and age-matched control individuals without breast or thyroid disease. METHODS: Clinical and ultrasound evaluation of thyroid gland, determination of serum thyroid hormone and antibody levels, and fine-needle aspiration of thyroid gland were performed in 150 breast cancer patients and 100 control individuals. RESULTS: The mean values for anti-thyroid peroxidase antibodies were significantly higher in breast cancer patients than in control individuals (P = 0.030). The incidences of autoimmune and nonautoimmune thyroid diseases were higher in breast cancer patients than in control individuals (38% versus 17%, P = 0.001; 26% versus 9%, P = 0.001, respectively). CONCLUSION: Our results indicate an increased prevalence of autoimmune and nonautoimmune thyroid diseases in breast cancer patients.

Does a Leu 512 Arg thyrotropin receptor mutation cause an autonomously functioning papillary carcinoma?

In the last decade, studies were first done to determine the frequency of Gsalpha and later thyrotropin receptor (TSHR) mutations in benign autonomously functioning thyroid nodules (AFTN). Different frequencies ranging from 0% to 38% for GSp mutations and from 20% to 86% for TSHR mutations were found. There were only some limited case reports related to TSHR genetic alterations in malignant AFTN. Their role in autonomously functioning thyroid carcinomas is not well established. We present a patient who had thyroidectomy for toxic multinodular goiter and a papillary carcinoma was demonstrated histopathologically. Genomic DNA was isolated from two solid areas in the hot nodule and peripheral leukocytes of the patient. After amplifying the related regions, TSHR and GSalpha genes were analyzed by single-strand conformation polymorphism (SSCP) analysis. The precise localization of the mutations was identified by automatic DNA sequence analysis. An activating mutation of the TSHR gene (Leu 512 Arg) was found in the autonomously functioning papillary carcinoma. It is believed that this mutation causes constitutive activation of the cyclic adenosine monophosphate (cAMP) signal transduction pathway and thereby causes thyrotoxicosis and a hot thyroid nodule in an autonomously functioning papillary carcinoma.

[The effect of ostioplasty and nasoantral window opening on mucociliary activity in the maxillary sinus: an experimental study in the rabbit]. / Endoskopik sinüs cerrahisinde kullanilan ostioplasti ve nazoantral pencere açilmasi tekniklerinin maksiller sinüs mukosilier aktiviteye etkisi: Tavsanlarda deneysel çalisma.

OBJECTIVES: We evaluated the effects of ostioplasty and nasoantral window opening techniques employed in endoscopic surgery procedures for maxillary sinuses on mucociliary activity in rabbits. STUDY DESIGN: The study included 15 adult male New Zealand white rabbits (mean weight 3.5 kg). The animals were divided into three groups equal in number. Following a vertical incision in the midline, one group underwent ostioplasty to widen the natural ostium of the maxillary sinus; a new nasoantral window was opened in another group; the other group (controls) underwent only sinus exploration. Thirty days after surgery, mucociliary activity of the maxillary sinuses was evaluated scintigraphically. RESULTS: Compared with the control group, mucociliary activity decreased significantly in both groups, showing a higher deterioration with the nasoantral window opening technique (p<0.001) than that with the ostioplasty technique (p<0.05). CONCLUSION: Since both techniques have adverse effects on the mucociliary activity of the maxillary sinuses, ostioplasty and nasoantral window opening techniques should be reserved for patients in whom they are uniquely required.

Therapeutical potential of autologous peripheral blood mononuclear cell transplantation in patients with type 2 diabetic critical limb ischemia.

AIM: The aim was to evaluate the therapeutic effectiveness of granulocyte colony-stimulating factor (G-CSF) mobilized peripheral blood mononuclear cells (PBMNCs) in critical limb ischemia (CLI) of type 2 diabetic patients. METHOD: Forty diabetic patients with CLI were enrolled and randomized to treatment and control groups. In the treatment group, the patients received subcutaneous injections of recombinant human G-CSF (30 MU/day) for 5 days to mobilize stem cells. PBMNCs were collected and transplanted by multiple intramuscular injections of 1 ml in 1-1.5-cm depth into ischemic limbs. RESULTS: At the end of 12 weeks of follow-up, the baseline and end point results in transplant group were as follows: Fontaine score improved from 3.8±03 to 3±0.5 (P=.0001), ankle brachial pressure index increased from 0.68±0.24 to 0.87±024 (P=.001), transcutaneous oxygen increased from 33±14 mmHg to 44±10 mmHg (P=.0001), and 6-min walking distance improved from 280±82 m to 338±98 m (P=.0001). Pain score decreased from 8.2±1.3 to 5.63±1.6 (P=.001), and the number of patients with limb ulcers was reduced from 9/20 (45%) to 3/20 (15%) (P=.031). In the control group, Fontaine score, 6-min walking distance, and pain score were improved; ankle brachial pressure index and transcutaneous oxygen pressure were not improved. The number of patients with limb ulcers did not change in the control group. There are improvement in amputation rates, collateral vessel development, and number of limb ulcers healed. CONCLUSIONS: These results indicate that the autologous transplantation of G-CSF that mobilized PBMNCs in CLI diabetic patients is safe and effective in patient compliant reduction and improved perfusion.

In-vivo gamma scintigraphic evaluation and determination of a gastro-resistant etodolac tablet in humans.

A gastro-resistant (enteric coated) etodolac tablet dosage form, was evaluated by using in vitro and in vivo methods. In vitro drug release studies have shown that enteric coated tablet dosage form protects the drug from being released under conditions mimicking stomach to small intestine transit. The gastro-intestinal transit of radiolabeled 300 mg enteric coated etodolac tablets in six healthy, fed and fasted state volunteers was monitored using external gamma camera. Dosage form position was reported at several time intervals. Etodolac serum concentrations were determined from serum samples drawn over 420 min following dosing. Differences in gastro-intestinal transit between fed and fasted volunteers had little effect on etodolac bioavailability. AUC, Tmax and C max values were calculated for both types of studies.

The smooth muscle ratio at the renal pelvis in adults: does it predict surgical outcome?

INTRODUCTION: Patients with ureteropelvic junction obstruction occasionally remain undiagnosed until adulthood. There are no objective criteria to predict the results of pyeloplasty in adult patients. We have evaluated the results of pyeloplasty in adult patients and investigated whether these results are correlated with the histopathology of the surgical specimen. MATERIALS AND METHODS: Histological sections from 26 patients with ureteropelvic junction obstruction were analyzed. Their mean age was 25.1 years. Diethylenetriamine-pentaacetic acid scans were used to determine the degree of renal obstruction and postoperative healing. Improvement in diuretic renography was defined as a greater than 20% decrease in the half-time of the preoperative value. To examine smooth muscle and collagen tissue, sections were stained using Masson's trichrome. Smooth muscle ratio was identified by color image analysis. RESULTS: 18 patients (69.2%) fulfilled the criteria of healing. Patients with an improved scan had a mean smooth muscle percent (SMP) of 1.85+/-0.87 while subjects with no significant change in their diuretic scans had a mean SMP of 0.36+/-0.03 (p=0.001). There was a strong correlation between the SMP and the improvement. CONCLUSIONS: Adult pyeloplasty was found successful in about 70% of the cases. The SMP of the renal pelvis seems to be helpful in predicting the surgical outcome.

Gallbladder and gastric motility in patients with idiopathic slow-transit constipation.

OBJECTIVE: Idiopathic slow-transit constipation (STC) has been suggested to be a pangastrointestinal motility disorder. We investigated scintigraphically whether motility in the gallbladder and stomach was impaired in slow-transit constipation. METHODS: Twenty-four patients with STC were studied. Colon transit time, gallbladder motility, and solid-phase gastric emptying were measured by scintigraphy. RESULTS: Gallbladder dysmotility was observed in 8 of 18 (44.4%) patients. Mean gallbladder ejection fraction was 41.6 +/- 13.6% (range, 16.3-67.0%). Gastric emptying was delayed in 9 of 18 (50%) patients. Mean solid-phase gastric half-emptying time was 75 minutes. STC may be associated with impaired function of other gastrointestinal organs. Approximately half of patients with STC presented gallbladder or gastric dysmotility. CONCLUSION: STC may not be a pure colonic abnormality; it may be a component of a pangastrointestinal tract motility disorder involving several organs.

Seminal plasma prostate-specific antigen level in benign prostatic hyperplasia.

INTRODUCTION: We evaluated the role of the seminal plasma PSA level in the prediction of the response to alpha-blocker treatment in patients with benign prostatic hyperplasia. MATERIALS AND METHODS: 18 male patients with lower urinary tract symptoms were enrolled in the study. After their blood was sampled for PSA, ejaculates of all the subjects were obtained. Serum and seminal plasma PSA levels were calculated by Active PSA IRMA kit. Patients were given 4 mg/day doxazosin for a period of 6 weeks, following which their International Prostate Symptom Score (IPSS) evaluation was repeated. The correlation between serum PSA, seminal plasma PSA and PSA density levels and the percentage improvement in IPSS was investigated. RESULTS: The mean serum PSA level, the mean PSA density and the mean seminal PSA level of the patients were 2.7 +/- 1.2 ng/ml, 0.05 +/- 0.02 ng/ml/cm(3) and 0.7 +/- 0.39 g/l, respectively. The percentage improvement in IPSS varied from 26.9 to 53.5%. Serum PSA and serum PSA density were not useful in the prediction of the response to alpha-blocker treatment, but the seminal PSA levels correlated with the percentage improvement in the IPSS (p = 0.017). CONCLUSIONS: Seminal plasma PSA has been found to be a better predictor of the response to alpha-blocker treatment when compared to serum PSA and PSA density.

Intrahepatic splenosis: a case report.

Splenosis is heterotopic autotransplantation and seeding of splenic tissue. In the literature, only a few cases of splenosis involving the liver and the radiologic characteristics of these lesions have been reported. We report a case of intrahepatic splenosis diagnosed by ultrasound, computed tomography, magnetic resonance imaging and scintigraphic features. To our knowledge, our patient is the first case diagnosed only by radiologic and radionuclide examination without any intervention.

Value of regional cerebral blood flow in the evaluation of chronic liver disease and subclinical hepatic encephalopathy.

AIMS: Regional changes in cerebral blood flow in patients with chronic hepatitis, cirrhosis and subclinical hepatic encephalopathy were investigated in the present study using single photon emission computed tomography (SPECT). METHODS: Twenty patients with cirrhosis, 11 patients with chronic hepatitis, and nine healthy controls were included in the study. Cerebral SPECT were obtained for all patients. The percentages of cerebral blood flow of 14 regions to the cerebellar blood flow were determined. Only the patients with cirrhosis underwent psychometric evaluation: visual evoked potentials (VEP) measurements and electroencephalogram (EEG) recordings along with blood levels of albumin, bilirubin, and ammonia were measured and prothrombin time was determined in cirrhotic patients. These patients were classified according to the Child-Pugh classification. RESULTS: Among cirrhotic patients, six had abnormal results in VEP studies, 11 in psychometric tests and with six in EEG evaluation. Any abnormality in psychometric tests and/or VEP studies is taken as the main criterion; subclinical hepatic encephalopathy was detected in 12 of 20 patients. According to SPECT results in patients with subclinical encephalopathy, a statistically significant decrease in cerebral blood flow in right thalamus and nearly significant decrease in left thalamus were observed. Regional blood flow was significantly higher in the frontal lobes of patients with cirrhosis when compared with healthy controls. Similarly, cerebral blood flow in frontal and cingulate regions was significantly higher in patients with chronic hepatitis than in healthy controls. There was no relationship between cerebral blood flow and blood levels of ammonia or Child-Pugh score, in cirrhotic patients. CONCLUSION: Significant changes in cerebral blood flow may be present in chronic liver diseases and the authors suggest that the measurement of changes in cerebral blood flow might be useful in detecting subclinical hepatic encephalopathy.