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50492 Surgery

A 64-year-old man presents with headache and left-sided upper extremity weakness. The MRI findings suggest that this is a glioblastoma multiforme. This is because the tumor exhibits which of the following?

AIt is regular in shape.
BIt is well demarcated from surrounding brain tissue.
CIt shows a ring pattern of enhancement with intravenous contrast and has a non-enhancing necrotic center.
DIt shows an absence of surrounding white-matter edema.
Surgery
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50497 Orthopaedics

A 33-year-old man presented with a slowly progressive swelling in the middle 1/3′ of his right tibia. X-rays examination revealed multiple sharply demarcated radiolucent lesions separated by areas of dense and sclerotic bone. Microscopic examination of a biopsy specimen revealed island of epithelial cells in a fibrous stroma. Which of the following is the most probable diagnosis?

AAdamantinoma
BOsteofibrous dysplasia
COsteosarcoma
DFibrous cortical defect
Orthopaedics
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