It develops in a small number of patients who were neglectful of treatment for syphilis or were not treated at all. 
Old and very young age, traumas (physical, psychic, medicamentous), chronic diseases and toxicosis, and alcoholism are conducive to the developm

Influenza
Etiology. Influenza viruses are single-stranded negative sense RNA viruses of the family Orthomyxoviridae. Three types (A, B, and C) of influenza viruses infect humans. Type A and B viruses are known to cause significant human disease. The genome contains

This is commonest abdominal surgery emergency
Surgical anatomy
The vermiform appendix can lie in a variety of positions. The relative frequency of the more usual positions occupied by the organ is:
retro cecal 74%
pelvic 21%
post ileal 5%