**Core Concept**
Mesenteric cysts are rare, benign or malignant neoplasms arising from the mesentery, which is a fold of tissue that attaches the intestine to the back of the abdominal wall. These cysts can be classified into different types based on their histological characteristics, including chylolymphatic, enteric, and teratomatous cysts.

**Why the Correct Answer is Right**
Chylolymphatic cysts are the most common type of mesenteric cysts and are believed to arise from the lymphatic vessels of the mesentery. These cysts are usually filled with a milky or chylous fluid and can cause symptoms such as abdominal pain, palpable mass, and intestinal obstruction. The chylolymphatic cysts have a distinct characteristic of having a separate blood supply, which is a key feature in distinguishing them from other types of mesenteric cysts.

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is incorrect because mesenteric cysts do not move perpendicular to the line of attachment. They are typically fixed to the surrounding mesentery and do not have a significant degree of mobility.

**Option B:** This statement is incorrect because teratomatous cysts are the rarest type of mesenteric cysts, not the most common. Chylolymphatic cysts are the most common type.

**Option C:** This statement is partially correct in that chylolymphatic cysts have a separate blood supply, but it is not entirely accurate as an answer choice because it does not address the question of which statement is true about mesenteric cysts.

**Option D:** This statement is incorrect because surgical removal of the bowel along with the cyst is not the treatment of choice for all types of mesenteric cysts. The treatment of choice depends on the type of cyst and the specific clinical scenario.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that mesenteric cysts can cause intestinal obstruction, and their treatment often requires surgical intervention. However, the approach to surgery should be tailored to the individual case and may involve resection of the cyst with or without bowel resection.

**Correct Answer:** B. Teratomatous is most common.