Skeletal pathology

A 12 years old boy suddenly noticed a hard swelling after a trivial trauma during playing football . The swelling developed in this form after 6 months. It is worm, tender, venous engorgement there. After seeing the location what may be the DD?

A 20-year-old male presented with a painless, hard subcutaneous mass in the popliteal fossa. He stated that the mass had been present for several years and did not change in size. X-ray & HPE images after resection are attached. Share your views regarding the case

63 years lady with well circumscribed breast mass. Trucut biopsy done . Images attached, Diagnosis ??

A 15-year-old girl presents to the outpatient clinic complaining of progressive pain around her left knee that has become intractable. She states that the pain is worst at night and does not respond to non-steroidal anti-inflammatory medications. On review of systems, she states having intermittent fever and gradual weight loss over the past 3 months. On examination, the left thigh is swollen, tense, and tender. Laboratory results reveals hemoglobin 12.4 g/dL, WBC count 10,600/mm3, platelets 380,000/mm3, erythrocyte sedimentation rate 18 mm/h, and alkaline phosphatase 320 U/L. X-ray of the knee is shown in the image. What is the most likely diagnosis? (A) Fibrous dysplasia (B) Nonossifying fibroma (C) Osteoid osteoma (D) Osteomyelitis (E) Osteosarcoma

45yr old male presented with swelling on rt side chest since 3 months. Examination revealed it to b a pulsatile mass. P/h/of untreated syphilis. D/D?