The molar tooth sign is pathognomonic for Joubert syndrome!

Poretti A Section of Pediatric Neuroradiology, Division of Pediatric Radiology, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins School of Medicine, Baltimore, Maryland; Division of Pediatric Neurology, University Children's Hospital, Zurich, Switzerland. Electronic address: aporett1@jhmi.edu.
Boltshauser E Division of Pediatric Neurology, University Children's Hospital, Zurich, Switzerland.
Valente EM Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza Institute, San Giovanni Rotondo, Italy; Department of Medicine and Surgery, University of Salerno, Salerno, Italy.