Which of the following statements correctly describes the WBB (Weinstein-Boriani-Biagini) staging system for spinal tumors?

• A It uses 5 zones radially and 4 layers axially to plan surgical approach
• B It classifies spinal tumors by grade and extent of cortical involvement only
• C It is used exclusively for metastatic spinal disease
• D It divides the vertebra into 12 clock positions and 5 concentric layers to guide en bloc resection ✓

Explanation

The WBB system was developed specifically for planning en bloc resection of primary spinal tumors. It divides the vertebra into 12 sectors (clock positions 1–12) and 5 concentric layers (A=paravertebral extraosseous, B=intraosseous superficial, C=intraosseous deep, D=extraosseous extradural, E=intradural). Surgical approach and feasibility of en bloc resection are determined by which sectors/layers are involved. It is designed for primary spinal tumors, not specifically for metastatic disease.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.