## **Core Concept**
Mesenteric cysts are rare, benign lesions that occur in the mesentery, which is a fold of tissue that attaches the intestine to the back of the abdominal wall. These cysts can arise from various tissues, including lymphatic, vascular, or teratomatous origins. Understanding their characteristics is crucial for diagnosis and management.

## **Why the Correct Answer is Right**
The correct answer involves understanding the specific characteristics of mesenteric cysts:
- **Moves perpendicular to the line of attachment (a):** This is a classic characteristic of mesenteric cysts. Because they are located within the mesentery, they move perpendicular to the line of attachment of the mesentery to the intestine.
- **Teratomatous is most common (b):** While teratomatous cysts do occur, they are not the most common type. Chylolymphatic or lymphatic cysts are often cited as the most common type.
- **Chylolymphatic cyst has separate blood supply (c):** This statement is true and is important for surgical planning. Chylolymphatic or lymphangiomas, a type of mesenteric cyst, often have a separate blood supply, which needs to be considered during surgical removal.
- **Surgical removal of bowel along cyst is treatment of choice in all the cyst (d):** This statement is not universally true. The treatment of choice depends on the type of cyst, its location, and its relationship to the surrounding bowel and vascular structures. For many mesenteric cysts, especially those with a separate blood supply like lymphangiomas, surgical removal of the cyst alone, preserving the bowel, is feasible and preferred.

## **Why Each Wrong Option is Incorrect**
- **Option B:** Teratomatous cysts are not the most common type of mesenteric cyst. While they do occur, lymphatic or chylolymphatic cysts are more frequently encountered.
- **Option D:** This option suggests that surgical removal of the bowel along with the cyst is the treatment of choice for all mesenteric cysts, which is not accurate. The approach to surgery is tailored to the individual case, aiming to preserve bowel length whenever possible.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that mesenteric cysts can often be diagnosed preoperatively with imaging studies like ultrasound and CT scans, which can help delineate their relationship to the bowel and vascular structures. Knowing that these cysts typically move perpendicular to the mesenteric attachment can aid in their clinical diagnosis.

## **Correct Answer:** C.