[Listeria monocytogenes abscess of the brain].

Introduction: Listeriosis commonly involves the central nervous system. Meningoencephalitis and rhomboencephalitis are the most frequent manifestations. Brain abscesses are rare.

[Crossed anarthria and a dissociated lateralisation of language].

Introduction: Crossed anarthria cases are uncommon and rather old.

Observation: We report the case of a right-handed 55-year-old man who presented crossed pure anarthria due to a hemorrhage in the premotor cortex (feet of F1 and F2) and in the high part of Pierre-Marie's quadrangle.

Conclusion: The study of different tasks (articulation, verbal fluency, direct object word-generation from a verb) showed a dissociated lateralisation of his language.

[Cerebral Erdheim-Chester disease].

We report the case of a 26-old-year man hospitalized for first partial complex epileptic seizure. Brain MRI showed an asymptomatic pseudo-tumor lesion in the brainstem. Diabetes insipidus, hypophyseal gonadotropic deficiency and osteosclerosis of long bones strongly suggested Erdheim-Chester disease, a rare histiocytosis, confirmed after tibial biopsy.