23: Myths of the Physical Exam part 1
IMreasoning - Clinical reasoning for Doctors and Students
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Trans-Illumination of the Sinuses
Trans-illumination of the sinuses is when you shine a very bright light into somebody's maxillary sinus. It has a positive likelihood ratio of 1.6 and a negative likelihood ratio of 0.5. That will roughly allow you to go from a pretest probability of 70% to maybe 73%.
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