Metastatic adenocarcinoma presenting as a one-and-a-half syndrome. Clinical, radiological, and pathological correlations.

The one-and-a-half syndrome, produced by a lesion in the tegmentum at the level of the pons, rarely has been reported as the result of a solitary metastasis. We report a case of adenocarcinoma of the lung metastatic to the pontine tegmentum with clinical, radiological, and pathological confirmation of the anatomy of this syndrome.