**Core Concept**
The Maltese cross is a characteristic radiographic finding associated with a specific condition. It is a pattern of calcification that resembles a cross, often seen in the context of aortic aneurysm or atherosclerosis.

**Why the Correct Answer is Right**
The Maltese cross is typically seen in the context of atherosclerotic aneurysm of the aorta, particularly in the descending thoracic aorta. This is due to the deposition of calcium in the atherosclerotic plaque, which forms a characteristic cross-like pattern on radiographs. The calcification is often seen in the form of a central dot, surrounded by a ring or a circle, resembling a Maltese cross.

**Why Each Wrong Option is Incorrect**
**Option A:** Not relevant, as the Maltese cross is not typically associated with cardiac conditions such as myocardial infarction.
**Option B:** Not relevant, as the Maltese cross is not typically associated with pulmonary embolism or other respiratory conditions.
**Option C:** Not relevant, as the Maltese cross is not typically associated with conditions such as appendicitis or other abdominal pathologies.

**Clinical Pearl / High-Yield Fact**
The Maltese cross is a classic radiographic sign of atherosclerotic aneurysm of the aorta, which should prompt further investigation with CT or MRI to assess the extent of the aneurysm and plan appropriate management.

**Correct Answer:** C. Atherosclerotic aneurysm of the aorta.