Skull and Spine Disorders
Mean age: 46 years; M >F
Path: soft encapsulated (75%) slightly hemorrhagic mass supplied by numerous feeding arteries
Histo: chief cells + sustentacular cells surrounded by fibrovascular stroma; nests of chief cells in classic Zellballen configuration
- lower back pain, sciatica (mean duration for 4 years)
Location: cauda equina, filum terminale
Site: intradural extramedullary compartment
Mean size: 3.3 (range, 1.510.0) cm
CT:
- bone erosion of spine
MR: - well-circumscribed mass isointense to cord on T1WI
- iso- to hyperintense on T2WI:
- cap sign = low-signalintensity rim on T2WI from hemorrhage
- ± salt-and-pepper appearance
- intense enhancement
- serpentine flow voids along surface + within tumor nodule
- ± syringohydromyelia
Angio:
- intense early blush persisting well into late arterial + early venous phase