Answers

Case 1 - 23 year old female with pain in left knee for three months

Giant Cell Tumor

Case 2 - 67 year old male with mass in right arm for several months

Extra-Skeletal Osteosarcoma

Case 3 - 50 year old female with painful mass in left leg for one month

Schwannoma

Case 4 - 45 year old female with three month history of pain in low back radiating to left lower extremity

Sacral Chordoma

Case 5 - 40 year old female with history of pain in low back and right thigh pain for the past eighteen months

Adamantinoma

Case 6 - 53 year old male with h/o radiation to right hemi-pelvis for Ewing’s Sarcoma thirty years ago; now presents with pain and swelling in right iliac region for four months

Post Radiation Sarcoma

Case 7 - 26 year old female with pain and swelling in the right knee for two years

Pigmented Villo-Nodular Synovitis

Case 8 - 64 year old male with a lump on medial aspect of right elbow for several months

Basilic Vein Aneurysm

Case 9 - 22 year old male with h/o ankle injury presents with progressively increasing pain in right ankle

Aneurysmal Bone Cyst

Case 10 - 16 year old male with pain in right knee

Hereditary Multiple Exostosis