A 65-year-old man presented to the emergency room after a fall, sustaining a head injury. A CT of the head showed diffuse, symmetric parenchymal calcifications involving the thalami globus palladi and caudate heads (figures 1 and 2). Detailed evaluation revealed a long-standing history of muscle cramps, involuntary choreiform movements and gradual cognitive decline. His medical history was unremarkable. On examination, Chvostek and Trousseau signs, tremor and rigidity were present. Laboratory studies included 6.3 mg/dL serum …