Unusual histopathological findings in appendectomy specimens: A retrospective analysis and literature review

Table 3 Distribution of the 1366 cases defined as “unusual findings” according to etiological causes

Total patients	1366 (1366/80 698 = 1.7%)
Unusual findings	1366	1.7%
Enterobius vermicularis	389	28.4%
Carcinoid	287	21.0%
Schistosomiasis	174	12.7%
Amoebic appendicitis	118	8.6%
Mucinous cystadenoma (+mucocele)	72	5.2%
Ascaris lumbricoides	39	2.8%
Tuberculous appendicitis	34	2.5%
Endometriosis	41	3.0%
Goblet-cell carcinoid	28	2.0%
Trichuris trichiura	22	1.6%
Idiopathic granulomatous appendicitis	35	2.5%
Crohn disease	18
Lymphoma	14
Primary adenocarcinoma	11
Mucinous cystadenocarcinoma	9
Actinomycosis	8
Melanosis	8
Secondary adenocarcinoma	7
Dysplastic change	7
Villous adenoma	6
Hyperplastic polyp	5
Taeniasis	8
GIST (+leiomyoma)	5
Balantidium coli	3
Tubulovillous adenoma	3
Eosinophilic granuloma	3
Neurogenic hyperplasia	2
Tubular adenoma	2
Leukaemia	4
Blastocystis hominis	1
Adenovirus	1
Strongyloides stercoralis	1
Yersinia enterocolitica	1