• Pamela Buchwald, Liane Dixon, Christopher J Wakeman, Tim W Eglinton, and Frank A Frizelle.
• Colorectal Unit, Department of Surgery, Christchurch Hospital, Christchurch, New Zealand.
• ANZ J Surg. 2017 Dec 1; 87 (12): 1011-1014.

BackgroundThe management of diverticular disease and its complications are an increasing burden to the health system. The natural history of conservatively managed diverticular abscesses (Hinchey I and II) is poorly described and it remains open to debate whether subsequent sigmoid resection is indicated after conservative management. This observational study compares outcomes of patients treated with conservative management (antibiotics +/- percutaneous drainage) and surgery.MethodsAll patients admitted at Christchurch Hospital with diverticulitis between 1 January 1998 and 31 December 2009 were recorded in a database. A retrospective analysis of patients with an abscess due to complicated diverticulitis was undertaken. Initial management, recurrence and subsequent surgery were recorded. The patients were followed until 1 January 2014.ResultsOf 1044 patients with diverticulitis, 107 with diverticular abscess were included in this analysis. The median age was 66 ± 16 and 60 were male. All patients had sigmoid diverticulitis and were diagnosed with a computed tomography. The median abscess size was 4.2 ± 2.1 cm. During median follow-up of 110 months, the overall recurrence rate was 20% (21/107). Recurrence varied according to initial treatment; namely antibiotics (30%), percutaneous drainage plus antibiotics (27%) and surgery (5%) (P = 0.004). The median time to recurrence was 4 ± 11.7 months, and most recurrences were treated conservatively; four patients underwent delayed surgery.ConclusionRecurrence after diverticular abscess is higher after initial conservative treatment (antibiotics +/- percutaneous drainage) compared with surgery, however, patients with recurrent disease can be treated conservatively with similar good outcomes and few patients required further surgery.© 2016 Royal Australasian College of Surgeons.

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