[Malignant schwannoma of the neck]. / Schwannoma maligno de cuello.

Malignant schwannoma (MS) is a tumor of the peripheral nervous system, extremely rare when settled in head and neck. Conversely these two are preferable locations for benign schwannomata. We report a feminine patient, 74-year-old, with a right laterocervical massa, evolving in 3 months, surgically removed and postoperative radiotherapeutic treatment, which remains asymptomatic since one year and a half.

[Thyroglossal duct cysts]. / Quistes del conducto tirogloso.

Perusal of records concerning 14 patients diagnosed and operated for Cysts of the thyrolingual duct, in the last 5 years (1984-1989). In this term the AA. have had at their disposal the newly diagnostic methods introduced at their Hospital. Among the clinic features considered in the paper, for instance, the age, they point out the differences verified between the own series and that of other authors. In the first decade only 28.57%; 35.71% in the second decade; and beyond 30 years again 35.71% of cases. Sixty-seven was de elder one. As well is emphasized the sexes distribution: 72% account for men and 28% for women, in the AA's statistics. None of the operated showed malignancies and postoperative recurrences were null.

[The time factor in hypoacusis caused by acoustic trauma]. / El factor tiempo en la hipoacusia por traumatismo sonoro.

This article relates the results of a research made about 26 persons who are working in a noisy environment and whose sense of hearing was damaged although the noise did not exceed the authorized limits (90 dB.) the group of persons was examined every year during 5 years and the average hearing loss was computed every year as well. Average and total losses are computed and it appears that the loss during the last year is much higher than during the previous years.