**Core Concept**
Malignant gastric ulcers are distinct from benign ulcers due to their underlying pathophysiology, which involves the infiltration of cancer cells into the gastric mucosa. This leads to the characteristic features of malignant ulcers, which can be distinguished from benign ulcers through clinical examination and imaging studies.

**Why the Correct Answer is Right**
The correct answer is A because malignant gastric ulcers do not typically extend beyond the gastric wall. Instead, they often have a more complex and irregular appearance. The presence of an ulcer extending beyond the gastric wall is more characteristic of a perforated gastric ulcer, which is a medical emergency. Malignant ulcers, on the other hand, may cause symptoms such as weight loss, anemia, and abdominal pain due to the infiltration of cancer cells into the surrounding tissues.

**Why Each Wrong Option is Incorrect**
**Option B:** Mucosal rugae stopping far from the ulcers is a characteristic feature of malignant gastric ulcers, as the tumor can cause the surrounding mucosa to become atrophic and lose its normal rugal folds. This is often seen in advanced cases of gastric cancer.
**Option C:** An eccentric crater is indeed a feature of malignant gastric ulcers, as the tumor can cause the ulcer to become irregular in shape and size. This is in contrast to benign ulcers, which tend to have a more regular and symmetrical appearance.
**Option D:** Raised margins are a characteristic feature of malignant gastric ulcers, as the tumor can cause the surrounding tissue to become inflamed and edematous, leading to the formation of raised margins.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the presence of a malignant gastric ulcer often requires a multidisciplinary approach, involving gastroenterologists, surgeons, and medical oncologists. A high index of suspicion and prompt diagnostic workup are crucial in identifying malignant ulcers and providing appropriate treatment.

✓ Correct Answer: A. ulcer extends beyond the gastric wall.