Frequency

Most of these diseases are rare or very rare. Reports on the distribution of the more common polyps vary considerably. The great majority of polyps consist of Elster glandular cysts in the gastric body, hyperplastic polyps, focal hyperplasias, and chronic erosions. Premalignant adenomas account for approximately 10% of polyps. The frequency data are summarized in Table 3.17.

Table 3.17 Frequency of benign tumors of the stomach wall

Benign tumor

Frequency

Elster glandular cysts

40-50%

Hyperplastic polyps

20-30%

Focal hyperplasia and chronic erosions

10-15%

Adenomas

ca. 10%

Heterotopic Brunner glands

< 2%

Carcinoid

< 2%

Heterotopic pancreatic tissue

<1%

Peutz-Jeghers polyp

<1%

Table 3.16 Benign tumors of the stomach

Neoplastic

Tumorlike

► Epithelial

Nonneoplastic polyps

- Adenomas

- Glandular cysts

► Endocrine

- Hyperplastic polyp

- Carcinoid

- Peutz-Jeghers polyp

► Mesenchymal

- Inflammatory fibromatous polyp

- Leiomyoma

- Heterotopic Brunner glands

- Neurinoma

- Heterotopic pancreatic tissue

- Neurofibroma

Special forms

- Lipoma

- Varioliform gastritis (= chronic ero

- Other rare

sions)

forms

- Focal hyperplasia

- Ménétrier disease

- Other rare forms

Fig. 3.94 Polyps with intact gastric mucosa ■ 108

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