osteosarcoma is a primary malignant tumor of bone, which can involve jaws. this article reviews osteosarcoma of the jaws referred to the department of oral pathology, dental faculty of tehran university of medical sicences and pathology department of cancer institiute in imam khomeini hospital during 30 years from 1349 to 1378 and also reviews jaw osteosarcoma in english literature. the purpose...

At the turn of the century there was an exciting expansion of knowledge and understanding of disease. William Osler commented "diseases familiar to our fathers and grandfathers have disappeared the public health measures have lessened the sorrows and brightened the lives of millions". It was the age of medical individualists, of men of outstanding ability, breadth of learning and great clinical...

PURPOSE Team-based learning (TBL) has been successfully used in non-medical curricula, but its effectiveness in medical education has not been studied extensively. We evaluated the impact of TBL on the academic performance of Year 2 medical students at Wright State University by comparing this active learning strategy against a traditional method of case-based group discussion (CBGD). METHODS...

CONTEXT Biospecimens must have appropriate clinical annotation (data) to ensure optimal quality for both patient care and research. Additional clinical preanalytic variables are the focus of this continuing study. OBJECTIVE To complete the identification of the essential preanalytic variables (data fields) that can, and in some instances should, be attached to every collected biospecimen by a...

From a cognitive neuroscience perspective, the study of attention has long centered on characterizing the basic systems we have in our brains for selecting what external sensory information to channel to our higher level, capacity-limited processes in cortex. Less understood is how these attentional systems ebb and flow in their selectivity over seconds to minutes in the course of pursuing our ...

Ethical oversight of clinical research is one of the primary means of ensuring that human subjects are protected from the natural bias of researchers and research institutions in favor of experimentation. At a minimum, effective oversight should ensure that risks are minimized and reasonable in relation to anticipated benefits, protect vulnerable subjects from potential coercion or undue influe...

Several methods for determining urea in blood and urine are in use in clinical laboratories, but none is ideal in mass routine analysis. The spectrophotometric method based on a modified Ehrlich reagent proposed by Watt and Chrisp (1954) for pure solutions is therefore of interest because it can be modified for use in mass clinical analyses of blood and urine. Brown (1959) has modified the meth...

Leaders Is the proficiency test in cervical cytology proficient? It is accepted that internal quality control and external quality assurance are necessary elements in ensuring high standards in the reporting of cervical smears. A major component of external quality assurance in the United Kingdom in recent years has been the proficiency test in cervical cytology. Participation in regional profi...

Reference values are used to describe the dispersion of variables in healthy individuals. They are usually reported as population-based reference intervals (RIs) comprising 95% of the healthy population. International recommendations state the preferred method as a priori nonparametric determination from at least 120 reference individuals, but acceptable alternative methods include transference...