This was surgically removed from brain of a one year old. Source: @GreenJournal 🧵
She presented w increased head circumference and motor delay. Note all the structures of her twin in her ventricles.
MRI hydrocephalus, compressed brain, and intraventricular mass with vertebral column, femur, & tibia. The fetiform mass has upper limb and finger-like buds. Reference n.neurology.org/content/100/9/…