<unk>  is characterized by four primary symptoms, collectively referred to as a tetrad: # Dysgraphia/agraphia: deficiency in the ability to write # Dyscalculia/acalculia: difficulty in learning or comprehending mathematics # Finger agnosia: inability to distinguish the fingers on the hand # Left-right disorientation
Gerstmann syndrome
Scheie syndrome
Gerstmann–Sträussler–Scheinker syndrome
Hurler–Scheie syndrome
Catel–Manzke syndrome
De Barsy syndrome
Pallister–Killian syndrome
Gleich's syndrome