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Table 1: 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.