Appendicular lumen is distended and appendicular epithelium is extensively ulcerated and reduced in few foci to a flat layer of simple columnar mucigenic epithelium. Foci of ulceration are seen related to dense non-specific inflammation rich in neutrophils, lymphocytes, plasma cells with histiocytes. This infiltrate extends to involve the whole thickness of the thick and fibrotic wall. No evidence of malignancy.
Acute appendicitis with dilated appendix up to 13 mm.
Appendicectomy specimen showing appendix 4.5 2.3 cm long with attached mesoappendix measuring 3x1.5 cm. Opening revealed almost complete replacement of appendix by a cyst filled with gelatinous material, with intact wall, 0.2 cm in thickness.
Appendicectomy: