NBME 18 Answers : Block 1 : #19 = 70 yo woman, increasingly severe pain in right knee over 3 months

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submitted by mahesh(0),

Osteosarcoma histological appearance. Paget disease is one of risk factor

spow Looking back, I know it's osteosarcoma but the lung metastases made me think of Ewing's +

makinallkindzofgainz Ewing sarcoma is common in boys <15 years old. This patient is a 70 year old woman. The stem notes elevated periosteum and a sunburst pattern which are characteristic of osteosarcoma. +

llamastep1 Also "sunburst pattern" is a classic description of Osteosarcoma. +