<qa>  What is the purpose of the PET scan?This will be a phase III open label study design in which additional safety data will be collected from the first patient being scanned from each of the first three batches of 18F-FDG delivered to our clinical site. Data will be collected from referring physicians with respect to how the PET scan results affected patient management and results of the PET scan will be correlated with biopsy results when available. All subjects are informed of anticipated effects none and purpose of the injected substance. There is no intent to change the way this protocol is conducted or to in any way alter the effect or purpose of the injected tracer. Subjects are approached with respect to their willingness to participate in the proposed study based on clinical criteria and undergo a brief clinical assessment followed by scanning as outlined below. 