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"A primary duodenal diverticulum occurs where there is a prolapse of mucosa through the muscularis propria. They usually occur within the 2^nd part (62%) and less commonly in the 3^rd (30%) and 4^th (8%) parts. Unlike secondary diverticula they are rarely seen in the 1^st part. When they occur in the 2^nd part, most (88%) are seen on the medial wall around the ampulla, 8% are seen posteriorly and 4% on the lateral wall."

Line 11:6 · Generally, don't use bold in text: '<strong>primary duodenal diverticulum</strong>'

"A secondary duodenal diverticulum results from prolapse of the entire duodenal wall and almost invariably occurs in the 1^st part of the duodenum. These are true diverticula and are usually secondary to duodenal or periduodenal inflammation, such as from previous ulcer disease."

Line 12:6 · Generally, don't use bold in text: '<strong>secondary duodenal diverticulum</strong>'

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