The Enneking surgical staging system for musculoskeletal tumors classifies a low-grade malignant tumor confined within a natural compartment barrier (intracompartmental) as:
- A Stage IB
- B Stage IA ✓
- C Stage IIA
- D Stage IIB
Correct answer: B. Stage IA
Explanation
The Enneking (MSTS) staging system: Stage I = low grade (G1), Stage II = high grade (G2); subscript A = intracompartmental (T1), subscript B = extracompartmental (T2); Stage III = any grade with regional or distant metastasis. Therefore: Stage IA = low-grade, intracompartmental; Stage IB = low-grade, extracompartmental; Stage IIA = high-grade, intracompartmental; Stage IIB = high-grade, extracompartmental. A low-grade, intracompartmental tumor = Stage IA. This staging guides the required surgical margin (wide vs. marginal).
Reference: Maheshwari Essential Orthopaedics, 6th ed.
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