MAPT and X-linked retinoschisis: When assessing disease-associated tau-PET patterns, we found elevated 18F-PI-2620 PET binding in CBS/PSP-RS patients particularly in the basal ganglia, i.e., typical sites of 4 R tau aggregation7, 8, congruent with a previous 18F-PI-2620 PET study in a partly overlapping sample27.