Abstract
The diagnosis of thoracobrachial outlet syndrome is one of the most discussed diagnoses. We report the case of a 33-year-old woman who presented to the consultation for pain, edema, and paresis of the left upper limb. Magnetic resonance imaging makes it possible to make the diagnosis, but it happens in certain situations that it reveals certain limits for the confirmation of this syndrome. This case highlights the false negatives of this examination in front of a very telling clinical picture.