Clogging process and related pressure drops in wire-wound filters: laboratory evidence.

The present work is aimed at analyzing the performance of the commercial filters used for the mechanical filtration of suspended solid particles. In particular, it is intended to evaluate the head losses due to the presence of the filter in the plant and how these losses vary depending on the circulating flow rate, the nominal porosity of the filter, and its clogging degree. Filters with interstices of different sizes, from 1 to 50 μm, were compared for the performance analysis.

Presacral epidermoid cyst. A case report.

Introduction: Most of the primitive cystic neoplasms arising in the retrorectal presacral space are congenital. Presacral epidermoid cysts are classified as a type of developmental cysts, resulting from an error during the embryogenesis. They have a slowly-progressive growth that only lately can cause clinically remarkable symptoms.