According to Enneking system, not true regarding an active benign tumor is –
**Core Concept**
The Enneking system is a surgical staging system used for musculoskeletal tumors, primarily malignant but also applicable to benign tumors. It assesses the tumor's biological behavior and potential for local recurrence, guiding treatment decisions.
**Why the Correct Answer is Right**
The Enneking system categorizes musculoskeletal tumors into three main groups: Stage I (low-grade, intracapsular, and non-invasive), Stage II (high-grade, intracapsular, or non-invasive but with a high risk of local recurrence), and Stage III (intra-articular or juxta-articular, or both). For an active benign tumor, the Enneking system would typically classify it as a Stage I or Stage II lesion, depending on its biological behavior and potential for local recurrence.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Enneking system primarily focuses on the tumor's biological behavior, not its histological features.
**Option B:** This option is incorrect because the Enneking system does not differentiate between benign and malignant tumors based on their histological characteristics.
**Option C:** This option is incorrect because the Enneking system is used for both benign and malignant musculoskeletal tumors, not just malignant ones.
**Clinical Pearl / High-Yield Fact**
The Enneking system is essential for surgeons to assess the tumor's potential for local recurrence and guide treatment decisions, such as en bloc resection or limb salvage.
**Correct Answer: C.**