Ganglioneuromas of the paravertebral sympathetic system invading the spinal canal (dumbbell tumors).
D005729:Ganglioneuroma; D006801:Humans; D009369:Neoplasms; D013115:Spinal Canal; D013116:Spinal Cord; D013564:Sympathetic Nervous System
NERVOUS SYSTEM, SYMPATHETIC; SPINAL CORD; TUMORS, GANGLIONEUROMA