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Histological characterization of appendectomy specimens with intraoperative appearance of vascular injection.

BACKGROUND: Acute appendicitis frequently needs acute surgical intervention. Laparoscopic appendectomy (LA) and conventional open appendectomy (OA) are well established procedures, but appendectomy for intraoperative inconspicuous or vascular injected appendixes remains under debate because of potential postoperative morbidity. The aim of this study was to correlate intraoperative nonacute appendixes with histological and clinical outcome.

METHODS: Between 2005 and 2009, a total of 1,017 patients underwent OA or LA. A total of 1,005 patients were enrolled with inclusion criteria of suspicious acute appendicitis preoperatively. One hundred twenty-nine of 1,005 patients had intraoperative normal, vascular injected or chronic appendixes that were defined as nonacute appendicitis. Intraoperative findings were correlated with histological results and clinical outcome of patients.

RESULTS: Of 129 (12.8 %) of 1,005 patients with macroscopically nonacute appendicitis intraoperatively, 16.3 % had normal findings, 81.4 % vascular injection, and 2.3 % chronic alterations; and 94.6 % of nonacute appendixes had histopathological alterations: 38.9 % chronic, 14.0 % neurogenic, 26.4 % acute, 13.2 % phlegmonous, and 2.3 % malignant. Coproliths were found in 21.7 % of patients, most in vascular injected appendixes. Four of seven patients with histopathological normal appendixes had coproliths. Morbidity rate was 2.3 %, with no mortality.

CONCLUSIONS: Appendiceal resection for intraoperative nonacute appendixes should be recommended because of high incidence of histopathological findings with low morbidity. In particular, chronic and neurogenous alterations cannot be predicted clinically or verified by radiological examination, but may cause recurrent symptoms.

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