Causes

        1) Obstruction of appendiceal lumen

a)    Fecalith (stool that enters the appendix hardens, 
becomes rock-like, and blocks the lumen)

b)   Gallstone

c)    Tumor

d)   Ball of worms (oxyuriasis vermicularis)

      2) Trauma

a)    Rupture of the appendix –>spread of bacteria outside

the appendix-> periappendiceal abscess