[Heat and vestibular stimulation]. / Calor y estimulación vestibular.

In 1905 Barany analyzed the nystagmus that appears during the irrigation of the ear with cold and hot water, justifying the phenomenon due to convectives currents in the horizontal semicircular canal. This hypothesis has been widely accepted until doubt was casted on it by the experiences carried out in the Skylab. Of the various mechanisms that could be responsible for the vestibular stimulation in the caloric tests, those which entail convection currents or endolymph expansion would need--we think--thermal gradients very superior to those occurring during these tests, that according to our calculations--always pro such hypothesis--seem insufficient.

[Polymorphic reticulosis of the rhinopharynx]. / Reticulosis polimorfa de rinofaringe.

"Malignant centrofacial granulomatosis" is an unusual but devastating spectrum of lymphoproliferative disorders that is now thought to include several entitites, such as polymorphic reticulosis or peripheral T-cell lymphoma. Characteristically there are destructive centrofacial lesions which often produce difficulties for the diagnostic to the clinician and pathologist. The case of a 71-year-old man diagnosed in our Department as polymorphic reticulosis sitting on the rhinopharynx is reported.

[Epithelial-myoepithelial carcinoma of smaller salivary gland]. / Carcinoma epitelial-mioepitelial de glándula salivar menor.

The epithelial-myoepithelial carcinoma of salivary glands is rarely presented and it's considered as an intermediate grade tumor. Usually are located in the parotid gland, however sometimes occur on minor salivary glands. An epithelial-myoepithelial carcinoma sitting on a palatine minor salivary gland of long course is reported.

[Epithelioid amelanotic melanoma of the nose and paranasal sinuses]. / Melanoma epitelioide amelanótico de fosas y senos paranasales.

Mucous melanomas are rare, representing 1-3% of melanomata and 3% of malignant nasosinusal tumors. The more usual location is the nasal cavity and paranasal sinuses. In early stages occur with a poor and unespecific features, which delays the diagnosis and worsen the prognosis. An amelanotic melanoma case is reported and bibliographic review of these tumors are made.