All are true about aneurismal bone cyst except ?
**Aneurismal Bone Cyst**
### Core Concept
Aneurysmal bone cysts (ABCs) are expansile, benign bone lesions characterized by a blood-filled, multicystic cavity surrounded by a thin layer of fibrous tissue. They typically occur in the metaphysis of long bones and can cause bone expansion, pain, and pathologic fractures.
### Why the Correct Answer is Right
Aneurysmal bone cysts are often associated with a high recurrence rate due to the incomplete removal of the lesion. They are usually treated with curettage and bone grafting to prevent recurrence. The histopathological examination of ABCs reveals a blood-filled cavity with a characteristic "soap bubble" appearance under microscopic examination.
### Why Each Wrong Option is Incorrect
**Option A:** Aneurysmal bone cysts are typically benign growths. This statement is true.
**Option B:** Aneurysmal bone cysts are often associated with a high recurrence rate. This statement is true.
**Option C:** Aneurysmal bone cysts are characterized by a blood-filled, multicystic cavity. This statement is true.
**Option D:** Aneurysmal bone cysts are typically found in the epiphysis of long bones. This statement is false, as ABCs are typically found in the metaphysis of long bones.
### Clinical Pearl / High-Yield Fact
Aneurysmal bone cysts can be distinguished from other bone lesions by their characteristic "soap bubble" appearance on radiographs. This is an important clinical correlation to remember for exam purposes.
### Correct Answer: D. Aneurysmal bone cysts are typically found in the epiphysis of long bones.