"Nine" syndrome: A new neuro-ophthalmologic syndrome: Report of two cases. 2015

Rohan R Mahale, and Anish Mehta, and Aju Abraham John, and Mahendra Javali, and Mirza Masoom Abbas, and Srinivasa Rangasetty
Department of Neurology, Mathikere Sampangappa Ramaiah Medical College and Hospital, Bangalore, Karnataka, India.

"Eight-and-a-half" syndrome is a rare condition involving the ipsilateral abducens nucleus or paramedian pontine reticular formation (PPRF), the ipsilateral medial longitudinal fasciculus (MLF), and the adjacent facial colliculus/facial nerve fascicle. The condition is often caused by a lesion (vascular or demyelinating) in the dorsal tegmentum of the caudal pons. There are new variants of this syndrome caused by extension of lesion to involve new adjacent structures in pontine tegmentum. We report two patients with different etiology presenting with clinical features suggestive of eight-and-a-half syndrome associated with hemiataxia representing "nine" syndrome (8½ + ½ = 9) adding new dimension to "eight-and-a-half" syndrome.

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