Oncology

Question 1

The most common parotid tumor in pediatric

Answer 1

Pleomorphic adenoma then hemangioma

Mucoepidermoid is the most common Malignant tumor in parotid

bengin most common than malignant in general

Question 2

Osteosarcoma

Answer 2

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)