[Basal cell carcinoma of the perianal region: a case report and literature review]. / Carcinoma basocelular de la región perianal: reporte de un caso y revisión de la literatura.

The literature reports an annual incidence of 5,900 cases of anal cancer in the developed countries. These involve three different anatomic zones: carcinoma of the anal canal, perianal carcinoma (formerly known as carcinoma of the anal margin, located at a distance of less than 5cm from the anal margin), and carcinoma of the perianal skin (at a distance greater than 5cm from the anal margin). Basal cell carcinoma of the perianal region is an uncommon tumor (0.27% of all diagnosed basal cell carcinomas) that in the majority of cases is treated by resection with disease-free margins. It must be differentiated from the basaloid and epidermoid variants of carcinoma, given that it has good outcome and its spread potential is practically null.

[Mesenteric solitary fibrous tumor: a case report and literature review]. / Tumor fibroso solitario en mesenterio: reporte de un caso y revisión de la literatura.

Solitary fibrous tumors are a very unusual group of spindle-cell neoplasm of adults; they were described for first time in the 18th century. They locate mainly in parietal and visceral pleura, lung parenchyma and pericardium. There are numerous reports that document their extrapleural location and we can find it in any place in the body, but mesenteric localization is extremely unusual.

[Gastric giant inflammatory fibroid polyp. case report and literature review]. / Pólipo fibroide inflamatorio gástrico gigante.Reporte de caso y revisión de la literatura.

The gastric inflammatory fibroid polyp (GIFP) is a rare benign tumor that is localized mainly in the antrum and presents endoscopically as a submucosal mass. The usual reported presenting size ranges among 1 and 5 cm. In this case report we present the largest GIFP published in the literature in a very uncommon localization, this is a 9.1 x 6.3 cm lesion in the gastric fundus.

[Utility of seriated sections in prostate biopsies]. / Utilidad de cortes seriados en biopsias prostáticas.

INTRODUCTION: With the routine use of prostate specific antigen, focal carcinomas and atypical small acini proliferation (ASAP) are currently detected more frequently. The number of sections per cylinder needed to detect most of them is still unknown. METHODS: We reviewed 250 sextant prostate biopsies in the 2008-2011 period. The average number of cylinders per biopsy was 14. In each case, in addition to the original sections with three histological levels, three more sections were performed with three levels (total: 12 levels). Biopsies with focal lesion were analyzed immunohistochemically. The frequency of focal lesions was compared to a previous study of 1000 biopsies in which a single section was made with three histological levels. The main clinical and laboratory data were recorded. RESULTS: There were 16 focal lesions (6.4%). Seven (2.8%) corresponded to focal carcinomas and nine (3.6%) to atypical proliferation. In the previous study, thirteen (1.3%) focal carcinomas and 29 (2.9%) cases with atypical proliferation were found. CONCLUSIONS: There was an increase of 4.2% to 6.4% of focal lesions carcinomas increased from 1.3% to 2.8%. Making additional sections in all biopsies may have practical drawbacks. However, they could be performed in patients with high clinical suspicion of carcinoma (especially in young patients), or when there is a history of atypical glandular proliferations consistent with carcinoma in previous biopsies.