[Mesoblastic nephroma in the adult. Report of a case]. / Nefroma mesoblástico del adulto. A propósito de un caso.

Congenital mesoblastic nephroma is a benign renal tumour of uncertain histogenesis and characteristic histology that can be mistaken with Wilms' tumour and other mesenchymal neoplasias. It is nearly always diagnosed in the early months of life, and its presentation in adults and older children is very rare. Its benign behaviour justifies the diagnostic significance mainly to avoid over-treatment. This paper presents one case of mesoblastic nephroma in a 17-year old female which appeared as a large abdominal mass. The therapeutic approach was radical nephrectomy and, after a 2-year follow-up, the patient has been found to be disease free.

[Peripheral centrofacial T lymphoma]. / Linfoma T periférico centrofacial.

Differentiating between Wegener's granulomatosis and other destructive centrofacial lesions often is difficult for clinicians and pathologists. It has become more confusing since what until now was known as "malignant centrofacial granulomatosis" seems to be a peripheral T-cell lymphoma. The case of an 83-year-old male recently diagnosed as angiocentric peripheral T-cell lymphoma which presented as a destructive centrofacial process is reported. The probable pathogenic role of Epstein-Barr virus (EBV) is highlighted.

[Pilomatrixoma of the auricle. Differential diagnosis with carcinoma pilomatrixoma]. / Pilomatrixoma de pabellón auricular. Diagnóstico diferencial con el carcinoma pilomatrixial.

A 34 year-old man, with a two centimeter diameter quickly growing nodule on the auricular pavillion is presented. After mass excision the histologic diagnosis of pilomatrixoma was made. Pilomatrixoma is a rare benign tumor arising on the hair matrix. The differential diagnosis include pilomatrix carcinoma, a locally and recurrent aggressive tumor capable to make pulmonary metastasis. A review of the literature is included, with emphasis on the clinical and histopathological aspects and the therapeutic attitude.