The Rhese View (Orbital Projection)
1. Clinical Definition
The Rhese view is an oblique radiographic projection specifically designed to visualize the optic canal. The patient is positioned with the chin, cheek, and nose touching the image receptor (PA oblique position).
2. High-Yield Indications
- Optic Canal Evaluation: Used to assess for fractures, enlargement (e.g., due to optic nerve glioma), or erosion of the optic canal.
- Orbital Tumors: Helps in identifying mass effects that may impact the optic foramen.
3. Radiological Positioning
| Key Feature | Description |
|---|---|
| Position | PA oblique, with the side of interest closest to the film. |
| Landmark | The optic canal should appear in the lower outer quadrant of the orbit. |
4. Exam Pearls
- Diagnostic Utility: While historically important for optic canal fractures in head trauma, it is now rarely utilized in modern practice. High-resolution CT (HRCT) of the orbits with multiplanar reconstruction is the current standard for evaluating the optic canal.
- Board Exam Focus: If you see this on an exam, associate it specifically with the optic canal.