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Cytoreduction followed by HIPEC showed a median survival of 21 months. From 3 years on, a consistent group of 18% of patients stayed alive.

In order to find out whether an interval appendectomy is necessary after a appendicitis with a palpable mass, we retrospectively studied the reports of 50 patients who underwent an interval appendectomy. Out of the 50 patients 5 (10%) developed complications of the appendiceal mass. Intraoperative findings of the interval appendectomy: 32 (64%) had adhesions; 2 (4%) appendices were resorbed; 2 (4%) had an abscess; 42 (84%) still had signs of inflammation. Seven (12%) patients had diseases other than appendicitis. Four patients (8%) had diseases which needed further treatment. Eight percent of the patients had perioperative complications. We conclude that an interval appendectomy should only be performed on special indications.

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