Osteosarcoma develops from abnormal osteoblast-like cells that produce immature bone or osteoid tissue. It usually affects areas of rapid bone growth, which is why it is often seen near the distal femur, proximal tibia, or proximal humerus. Tumour growth weakens normal bone structure, increasing the risk for pain, swelling, impaired mobility, and pathologic fracture. The most common metastatic site is the lungs, so staging often includes chest imaging along with local imaging and biopsy confirmation. CT chest and bone imaging are commonly used to evaluate metastatic spread, while biopsy confirms diagnosis and tumour grade. For NCLEX-RN (Canada), items rarely announce the topic in the first sentence. Anchor to objective data, trajectory, and the safest next step for the role named in the stem before distractors compete. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline,...