In their colonization of the Americas, the Spanish used the…
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In their cоlоnizаtiоn of the Americаs, the Spаnish used the encomienda system to--
Osteоsаrcоmа Bаckgrоund Most common primary malignant bone tumor in children and adolescents (peaks at ages 10–20 years). Associated with rapid growth and metaphyseal regions of long bones (commonly distal femur, proximal tibia, proximal humerus). Risk factors: Paget disease of bone, radiation exposure, familial syndromes (e.g., Li-Fraumeni, hereditary retinoblastoma). Symptoms Progressive localized bone pain, often worse at night and not relieved by rest. Swelling or palpable mass at the site. May present after minor trauma, which brings attention to the lesion. Physical Exam Findings Tenderness and swelling at the metaphyseal region of the affected bone. Limited range of motion if near a joint. Possible palpable firm mass fixed to bone. Making the Diagnosis X-ray: “Sunburst” periosteal reaction, Codman’s triangle (periosteal elevation). MRI: defines local extent of tumor and relationship to soft tissue. Chest CT: screens for lung metastasis (most common site). Biopsy: confirms diagnosis (malignant osteoid-producing cells). Management Neoadjuvant chemotherapy followed by surgical resection (limb-sparing surgery when possible; amputation if needed for local control). Postoperative chemotherapy to reduce recurrence. Prognosis improved significantly with multi-agent chemotherapy; 5-year survival ~60–70% in localized disease.
Clаvicle Frаctures Bаckgrоund The clavicle is the mоst cоmmonly fractured bone, especially in children and adolescents, after a fall on an outstretched hand or direct blow to the shoulder. Pathophysiology involves the disruption of the bone shaft, typically at the midshaft, where forces are concentrated. Accounts for a large percentage of pediatric fractures, typically in healthy, active children and teens. Symptoms Acute pain localized to the shoulder/clavicle. Swelling, bruising, and decreased shoulder range of motion. Sometimes a “crunch” or popping sound at the time of injury. Physical Exam Findings Visible deformity or step-off at the midshaft. Tenting of skin may suggest risk for open fracture. Tenderness over the clavicle; guarding of arm. Neurovascular exam usually normal but must be checked carefully. Making the Diagnosis Diagnosis is confirmed with plain X-ray (AP view of clavicle). Imaging may show midshaft fracture with or without displacement. Always check for pneumothorax or vascular injury in high-energy trauma. Management Lifestyle/Activity: Sling or figure-8 brace for 4–6 weeks, gradual return to activity. Procedures: Surgical fixation only if open, severely displaced, or associated with neurovascular injury. Medications: NSAIDs for pain control. Education: Encourage early ROM exercises after immobilization; watch for nonunion, especially in older teens/adults. Question A 35-year-old cyclist presents with an open midshaft clavicle fracture with exposed bone after a high-speed crash. What is the most appropriate next step in management?