Clinical and MR features of the 6 patients with vestibular schwannoma showing a focal hyperintensity in the dorsal brain stem
| Patient No./Age (y)/Sex | Side | Tumor Size (mm) | Internal Architecture | Distance from Median Sulcus (mm) | Depth from Floor of 4th Ventricle (mm) | Section No. Showing Hyperintensity on CISS | Initial Symptom | Period of Postoperative MR Imaging after Surgery |
|---|---|---|---|---|---|---|---|---|
| 1/24/F | Left | 25 × 30 × 14 | Solid with a central small cyst | 7–8 | 2–3 | 5 | Tinnitus, ear fullness | 2 y 11 mo |
| 2/30/F | Right | 17 × 20 × 16 | Solid with several small cysts | 7–8 | 2–4 | 5 | (Head trauma) | 5 y 4 mo |
| 3/47/M | Left | 20 × 30 × 18 | Cystic > solid | 7–9 | 3–6 | 5 | Tinnitus | 5 mo |
| 4/52/M | Right | 39 × 50 × 36 | Mainly cystic | 5–7 | 2–4 | 5 | Facial dysesthesia | 1 y 3 mo |
| 5/53/M | Left | 32 × 35 × 32 | Mainly cystic | 8–9 | 1–2 | 6 | Hearing loss | 3 y 1 mo |
| 6/54/F | Right | 21 × 21 × 15 | Solid | 7–11 | 2–4 | 6 | Dizziness | 2 y 1 mo |
Note:—CISS indicates constructive interference in steady state axial imaging.