Oncology Flashcards
The most common parotid tumor in pediatric
Pleomorphic adenoma then hemangioma
Mucoepidermoid is the most common Malignant tumor in parotid
bengin most common than malignant in general
Osteosarcoma
Osteosarcoma
- most frequently diagnosed in 2nd decade of life (60%), 2nd most common primary malignancy in adults
- history of Paget’s disease, previous radiation treatment
- predilection for sites of rapid growth: distal femur (45%), proximal tibia (20%), and proximal humerus (15%)
invasive, variable histology; frequent metastases without treatment (lung most common)
- painful symptoms: progressive pain, night pain, poorly defined swelling, decreased ROM
- radiographic findings:
1- characteristic periosteal reaction: Codman’s triangle or “sunburst” spicule formation (tumour extension into periosteum)
2- destructive lesion in metaphysis may cross epiphyseal plate
• management:
complete resection (limb salvage, rarely amputation), neo-adjuvant chemo; bone scan – rule out skeletal metastases, CT chest – rule out pulmonary metastases
• prognosis: 70% (high-grade); 90% (low-grade)