The harmful effects of ultraviolet radiation on aquatic animals, due to ozone layer reduction, have been long studied in recent years. Exposure of Rainbow Trout larvae (Oncorhynchus mykiss) to Ultraviolet-B radiation (UV-B) at different doses (68.75 µw/cm2 and 94.83 µw/cm2 as the minimum and maximum dose of UV-B in natural environment respectively) for 15 minutes once a day in dark condition in...

BACKGROUND This study aimed to analyze the clinical features, causative pathogens, neuro-imaging findings, and therapeutic outcomes of bacterial brain abscess in patients with nasopharyngeal carcinoma (NPC) following radiotherapy. METHODS NPC patients with bacterial brain abscess were evaluated. Their clinical data were collected over a 22-year period. For comparison, the clinical features, c...

The efficacy and toxicity of three-fraction CyberKnife radiotherapy were evaluated in patients with brain metastases in critical areas. One hundred and fifty-nine metastases in 145 patients including tumors >10 cm(3) were treated with three-fraction CyberKnife radiotherapy with a median marginal dose of 27 Gy at a median prescribed isodose of 60%. Changes in the neurological manifestations, loc...

Brain metastases are the most common intracranial tumors, with an incidence of about 150 000 new cases per year in the US. Radiosurgery is increasingly used as the first line treatment of these lesions because it achieves a high local control rate (95%) with relatively little side effects, such as radiation necrosis (5-15%) 2, . Differential diagnosis between tumor relapse and radiation necrosi...

Femoral head avascular necrosis (AVN) is bone destruction due to subchondral oxygen deficiency and necrosis. Our patient is a 63-year-old man with Gleason score 5+4 prostate cancer. He received external beam radiation therapy (7200 cGy) along with combined androgen blockade therapy of lupon/casodex. The patient was complaining of bone pain and on a surveillance NaF18-PET/CT to rule out prostate...

UNLABELLED Our purpose was to evaluate the ability of FDG PET to differentiate recurrent tumor from posttherapy radiation necrosis. METHODS MR images, PET scans, and medical records of 84 consecutive patients with a history of a treated intracranial neoplasm were evaluated retrospectively. In all patients, recurrent tumor or radiation necrosis was suggested by clinical or MR findings. Metabol...

Gliomas are the most common primary brain tumors. In adults, the most frequent subtype is glioblastoma, an aggressive and lethal tumor characterized histologically by frequent mitoses, rich angiogenesis and necrosis. Multimodality treatment is the standard of care: maximal safe resection followed by partial brain irradiation combined with temozolomide. Resection followed by radiation produces a...

Cerebral necrosis after radiotherapy for brain tumors is being recognized as a problem more common than previously estimated. Distinction between this iatrogenic complication and tumor recurrence cannot be made by either CT or MR imaging. By using positron emission tomography (PET) with 18F-deoxyglucose (FDG) we were able to reach a diagnosis of radiation necrosis, later verified, in 10 of 95 p...