What is the primary purpose of obtaining a definitive diagnosis via biopsy in the context of limb-sparing or amputation decisions?

• A. To determine treatment options
• B. To diagnose only for academic interest
• C. To confirm imaging studies are wrong
• D. To reduce cost

Answer: (A)

The main idea is that a definitive histopathologic diagnosis from biopsy directly informs how you plan treatment, especially whether limb-sparing is oncologically safe and feasible. Knowing the exact tumor type and grade, and how far it has invaded surrounding tissues, tells you if you can achieve clean margins with limb preservation or if amputation is necessary to remove all tumor tissue. It also guides the need for any neoadjuvant or adjuvant therapies and helps with prognosis. Imaging can raise suspicion, but only tissue diagnosis confirms the tumor behavior that drives the surgical plan and overall management.