Fundic gland polyps and hyperplastic polyps
These two types of lesions share a similar radiological appearance: on double-contrast imaging and contrast-enhanced axial CT, they appear as multiple lesions that actively take up contrast. The main difference lies in their origin and localization.
Fundic gland polyps (Fundic gland polyps) are strictly localized to the proximal gastric body and fundus (fundus). Most commonly, they appear in response to long-term proton pump inhibitor (PPI) therapy—in this case, the lesions have virtually no malignant potential. Much less frequently, they are associated with familial adenomatous polyposis (FAP).
Hyperplastic polyps (Hyperplastic polyps) are morphologically identical to fundic gland polyps on imaging, but are predominantly located in the gastric body.
Adenomatous polyps (Adenomas)
Unlike fundic and hyperplastic polyps, adenomas (Adenomatous polyps) are true precancerous lesions microscopically resembling colonic adenomas. Due to their biological profile and the presence of high-grade dysplastic changes, they are now reclassified as non-invasive intraepithelial neoplasia (NiN).
Macroscopically, these are typically single (solitary) projections on a stalk (pedunculated) or with a broad base (sessile). The typical affected area is the antrum of the stomach. The development of adenomas is closely linked to atrophic gastritis. Furthermore, they serve as a marker for polyposis syndromes:
- Familial adenomatous polyposis (FAP);
- Gardner syndrome (Gardner syndrome);
- Turcot syndrome (Turcot syndrome).
The risk of finding invasive carcinoma directly within an adenoma correlates directly with three factors: an increase in lesion size, the presence of villous histology (villous histology), and high-grade cellular dysplasia.
Hamartomatous polyps
Hamartomatous polyps (Hamartomatous polyps) are considered the least common type of lesions. They do not possess any specific radiological or endoscopic features that would reliably distinguish them from other types.
They may occur sporadically or as part of conditions such as juvenile polyposis, Peutz-Jeghers (Peutz-Jeghers), Cowden (Cowden), and Cronkhite-Canada (Cronkhite-Canada) syndromes. Although the term "hamartoma" traditionally indicates a non-neoplastic nature of the lesion, such polyps in the stomach may well coexist with precancerous adenomatous polyps.
General radiological signs and mesenchymal tumors
It is important to understand that reliably differentiating histological subtypes of polyps based solely on radiological findings is impossible. During a double-contrast barium study, the diagnostician focuses on general manifestations:
- Small mucosal polyps. They have exceptionally sharp contours. Their surface may be smooth, lobulated, or nodular (both pedunculated and sessile). Key marker: when brought into profile, the polyp forms acute angles with the adjacent gastric wall.
- Large polyps. Characterized by a prominent lobular surface. Areas of erosion or deep ulceration are frequently visualized on them, which can convincingly mimic malignant infiltrative growth on imaging.
In addition to mucosal lesions, one must remember mesenchymal tumors (Mesenchymal Tumours). They originate from the deep submucosal layer (submucosa) and firmly occupy second place in frequency among all benign gastric lesions after polyps. The most common representative of this distinct group is the gastrointestinal stromal tumor (GIST).
Briefly: answers to topical questions
What are the histological types of gastric mesenchymal tumors other than gastrointestinal stromal tumors (GIST)?
In addition to gastrointestinal stromal tumors, there is a rare and heterogeneous group of non-stromal mesenchymal neoplasms, which includes gastric lipoma.
- Non-stromal mesenchymal neoplasms — a heterogeneous group of non-epithelial tumors.
- Gastric lipoma (Gastric Lipoma) — a rare neoplasm of fat density with a thin capsule, most commonly localized in the antrum.
What is the pathogenesis of fundic gland polyp development during long-term proton pump inhibitor therapy?
Fundic gland polyps can develop in response to chronic proton pump inhibitor therapy. The sources do not describe the pathogenesis of their formation associated with PPIs.
To remember the risk factors for invasive carcinoma within an adenoma, use the "Rule of Three Vs": Outstanding size, Villous architecture, Very high grade of dysplasia.
Class and exam questions
What angle does a small polyp form with the adjacent gastric wall on an X-ray?
When examined in profile, small mucosal polyps consistently form acute angles with the adjacent gastric wall.
In which part of the stomach are fundic gland polyps most commonly localized?
As the name implies, they are localized in the fundus and the proximal body of the stomach.
What is the malignant potential of polyps that developed during PPI therapy?
Fundic gland polyps associated with chronic proton pump inhibitor therapy possess virtually no malignant potential.
What is GIST and where do they originate from?
These are gastrointestinal stromal tumors. Unlike classical mucosal polyps, they are mesenchymal tumors and originate from the submucosal layer.
What else to study on this topic
- Radiological presentation and differential diagnosis of mesenchymal tumors (GIST).
- Hereditary polyposis syndromes: pathogenesis and extragastric manifestations.
- Differential diagnosis of large ulcerated polyps and gastric cancer.
- Methodology of double-contrast barium swallow of the stomach.
Master the entire topic in the "Diagnostic Radiology" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Gastric Polyps" and 2,199 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 10 video lessons on the subject
Other topics in the section "Diagnostic Radiology of the Abdominal Organs"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.