A diagnostic decision support system designed by clinicians to aid medical professionals in the diagnosis of visually identifiable diseases. Provides instant access to specialist knowledge at the point of care, merging medical images with concise clinical text. Includes more than 18,000 images representing over 1,000 visually identifiable diseases, drug reactions, and infections. As the clinician enters specific patient findings, VisualDx creates a visual differential diagnosis. The clinician enters symptoms and other clinical findings, such as lesion type, body location, medical history, medications, etc. With each entry, the system builds and refines the differential, never eliminating a diagnostic possibility but ranking each one by relevance to the patient findings. VisualDx displays images and key clinical information on all relevant diagnoses for a quick side-by-side comparison to the patient. Intended not to substitute, but to complement traditional medical information sources.