Most common site of peptic ulcer
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I now have comprehensive information from authoritative surgical and pathology textbooks. Here is the answer:
Most Common Site of Peptic Ulcer
Overall: First part (duodenal bulb) of the duodenum
The duodenum is the most common site for peptic ulceration. Specifically, ulcers occur in the duodenal bulb (first part of the duodenum), and gastric ulcers occur at roughly one-third the frequency of duodenal ulcers.
"Benign gastric ulcers are a form of peptic ulcer disease, occurring with one-third the frequency of benign duodenal ulceration." — Mulholland and Greenfield's Surgery, Scientific Principles and Practice, 7e
Sites in Summary
| Site | Frequency |
|---|---|
| Duodenum (bulb/first part) | Most common (~80%) |
| Stomach (lesser curvature / angularis incisura) | ~20% |
| Distal duodenum, jejunum | Rare (think Zollinger-Ellison) |
| Esophagus, Meckel's diverticulum | Uncommon |
Gastric Ulcer: Most Common Sub-site
When a gastric ulcer does occur, approximately 60% are located along the lesser curvature proximal to the incisura angularis (angulus) — this is the Johnson Type I gastric ulcer, the most common type, occurring at the border between antral and corpus mucosa.
"Benign gastric ulcers may occur in any location in the stomach, but approximately 60% are located along the lesser curvature proximal to the incisura angularis. Less than 10% of benign gastric ulcers are located on the greater curvature." — Mulholland and Greenfield's Surgery, 7e
Key Pathophysiologic Reason
Duodenal ulcers predominate because the duodenal bulb receives the highest acid load from the stomach, and H. pylori-related gastritis causes increased gastric acid secretion along with reduced duodenal bicarbonate buffering — creating ideal conditions for mucosal breakdown at the first part of the duodenum.
— Schwartz's Principles of Surgery, 11th Ed.; Mulholland & Greenfield's Surgery, 7e; Robbins & Cotran Pathologic Basis of Disease
Most common CNS tumour in adults
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This is a classic question with a nuance that's critical to get right. Here's the full picture drawn from authoritative neurology and surgery textbooks:
Most Common CNS Tumour in Adults
The Answer Depends on the Category
| Category | Most Common Tumour |
|---|---|
| Overall intracranial tumour (all types) | Metastatic tumour |
| Primary intracranial tumour | Meningioma |
| Primary malignant brain tumour | Glioblastoma (GBM, IDH-wildtype) |
1. Overall: Brain Metastases
Brain metastases are the most common intracranial tumour in adults overall, outnumbering primary tumours by a significant margin. Roughly 200,000–300,000 cases are diagnosed annually in the US, vs. ~35,000 new primary brain tumours. At autopsy, up to 40% of adult cancer patients have undiagnosed brain metastases.
"BMs are the most common intracranial tumor in adults, with 200,000–300,000 diagnosed annually in the United States." — Bradley and Daroff's Neurology in Clinical Practice
Common primary sources (in decreasing order): lung > breast > melanoma > renal > GI. Lung cancer alone accounts for up to 50% of all brain metastases.
2. Primary Brain Tumours: Meningioma
Among primary CNS tumours, meningioma is the most common, accounting for ~36% of all primary brain and CNS tumours (CBTRUS data). It is:
- Benign, slow-growing, extra-axial
- Arises from arachnoid cap cells
- More common in women, peak incidence 30–70 years
- Accounts for 15–25% of primary intracranial tumours
"The most common intracranial tumor in most series is meningioma, but it accounts for a very small portion of deaths." — Adams and Victor's Principles of Neurology, 12th Ed.
3. Primary Malignant Tumour: Glioblastoma (GBM)
Among malignant primary brain tumours, glioblastoma multiforme (GBM, IDH-wildtype, WHO Grade 4) is the most common and the most lethal, accounting for ~15% of all primary CNS tumours and the majority of glioma-related deaths.
Frequency Table (CBTRUS, Primary CNS Tumours)
| Tumour Type | % of Primary CNS Tumours |
|---|---|
| Meningioma | 36% |
| Gliomas (total) | 23.5% |
| — Glioblastoma | 15% |
| — Astrocytoma | 5.7% |
| Pituitary tumours | 15.5% |
| Schwannoma | 8% |
| Craniopharyngioma/dermoid/teratoma | 4% |
| Lymphoma | 2% |
| Ependymoma | 1.9% |
| Oligodendroglioma | 1.6% |
(Source: Adams and Victor's Principles of Neurology, 12th Ed., from CBTRUS 2008–2012)
Quick Memory Hook
- All intracranial tumours in adults → Metastases (most common)
- Primary tumours → Meningioma (most common, but mostly benign)
- Primary malignant tumours → Glioblastoma (most deadly)
- In children → Medulloblastoma (posterior fossa) and astrocytoma predominate
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