Answers

Case 1

V.D. - 51 year old woman with intermittent right knee pain and swelling after twisting it three years ago

Answer: Chondroid lipoma

Case 2

T.F. – 34 year old woman with a history of arthroscopic and open left knee surgeries in 2003 presenting with increased left knee pain and swelling

Answer: Pigmented villonodular synovitis

Case 3

S.L. – 66 year old woman with a history of sarcoidosis and polycythemia vera with low back pain for two months and acute left shoulder pain after opening a window

Answer: Anaplastic large cell lymphoma

Case 4

L.Q. – 54 year old man with a right forearm mass for ten years which has been slowly growing

Answer: Fibrolipoma

Case 5

P.S. – 86 year old man with a neck and shoulder mass first noticed seven months ago which has been rapidly growing

Answer: Low grade fibromyxoid sarcoma

Case 6

L.T. – 53 year old woman with left lower extremity and pelvic pain for two months

Answer: Malignant fibrous histiocytoma, pleomorphic type

Case 7

V.D. – 16 year old male with right ankle pain

Answer: Giant cell tumor

Case 8

F.W. – 33 year old man with a recent discovery of a painful mass in his left hand

Answer: Epidermal inclusion cyst with multinucleated giant cell reaction