Introduction Intramedullary osteosarcoma is the most common primary sarcoma of bone the most common malignancy of bone is metastatic disease the most common primary malignancy of bone is myeloma Age & location usually occurs in children and young adults bimodal distribution of occurrence majority occur in the second decade of life second peak in occurrence is in elderly patients with Paget's disease most common site is the distal femur and proximal tibia other common sites include proximal humerus, proximal femur, and pelvis Malignancy most commonly diagnosed as Stage IIB (high grade, extra-compartmental, no metastases) 10-20% of patients present with pulmonary metastases (obtain CT of chest) lung is most common site of metastasis bone is second most common site Genetics patients who carry the Retinoblastoma tumor suppressor gene (Rb) are predisposed to osteosarcoma risk increased in Rothmund Thomson syndrome AR inheritance, mutations in RECQL4 gene, chr 8q24.3 sun-sensitive facial poikiloderma rash (pigmentation, thinned skin, prominent blood vessels) absent eyelashes, eyebrows, hair juvenile cataracts, teeth abnormalities osteosarcoma, fibrosarcoma, gastric adenocarcinoma, cutaneous BCC and SCC Prognosis 76% long-term survival with modern treatment poor prognostic factors include advanced stage of disease (most predictive of survival) response to chemotherapy (as judged by percent tumor necrosis of resected specimen) tumor site and size expression of P-glycoprotein high serum alkaline phosphatase high lactic dehydrogenase vascular involvement surgical margins type of chemotherapy regimen Symptoms Symptoms rapidly progressive pain, fever, and swelling Physical exam may feel mass on examination Imaging Radiographs characteristic blastic and destructive lesion sun-burst or hair on end pattern of matrix mineralization periosteal reaction (Codman's triangle) large soft tissue mass with maintenance of bone cortices MRI must include entire involved bone to determine soft tissue involvement neurovascular involvement presence skip metastases if skip metastases are found, this is equivalent to metastatic (stage III) disease Bone scan very hot in osteosarcoma useful to evaluate extent of local disease and presence of bone metastases CT chest CT is required at presentation to evaluate for pulmonary metastases Labs Elevated alkaline phosphatase may be 2-3 times normal value Histology Characteristics tumor cells show significant atypia, and produce "lacey" osteoid stroma cells show malignant characteristics with atypia, high nuclear to cytoplasmic ratio, and abnormal mitotic figures May have mixed histology with different combinations of chondroblastic,osteoblastic, or fibroblastic looking cells depends on the subtype of osteosarcoma Giant cells may be present in giant cell rich osteosarcoma often confused with giant cell tumor of bone Diagnosis biopsy is required to obtain tissue diagnosis and institute therapy improper biopsy techniques are associated with increased rates of complications biopsy should be performed by the surgeon responsible for definitive treatment of the sarcoma, or after discussion with this surgeon Treatment Operative multi-agent chemotherapy and limb salvage resection indications high grade osteosarcoma chemotherapy preoperative chemotherapy given for 8-12 weeks followed by maintenance chemotherapy for 6-12 months after surgical resection 98% necrosis after neo-adjuvant chemotherapy is good prognostic sign expression of multi-drug resistance (MDR) gene tends to have a poor prognosis tumor cells can pump chemotherapy out of cell with MDR expression present in 25% of primary lesions and 50% of metastatic lesions surgical technique trend towards limb salvage whenever possible overall survival in osteosarcoma is equal after limb salvage vs. amputation to deal with local extent of disease rotationplasty is a great surgical option which optimizes the patient's function, and most commonly done in a pediatric population wide surgical resection indications indicated in low grade osteosarcoma such as parosteal osteosarcoma amputation indications pathologic fracture encasing neurovascular bundle enlarging during preop chemo AND adjacent to neurovascular bundle Differentials & Groups Destructive bone lesion in young patients (1) Treatment is Wide Resection & Chemotherapy (2) Osteosarcoma (intramed. & periosteal) • • Ewing's sarcoma • • Leukemia • Lymphoma • Eosinophilic granuloma • Osteomyelitis • Desmoplastic fibroma • MFH / fibrosarcoma • Dedifferentiated chondrosarcoma • Secondary sarcoma • Rhabdomyosarcoma (soft tissue) • ASSUMPTIONS: (1) Younger patient is < 40 yrs; (2) assuming no impending fracture IBank Location Age Xray Xray CT Bone scan MRI MRI Histo Case A proximal tibia 13 Case A prox. tibia Case B distal femur Case C distal femur Case D pelvis Case E femoral shaft Case F prox. humerus Case F ankle Case G
Technique Guide Technique guide are not considered high yield topics for orthopaedic standardized exams including the ABOS, EBOT and RC. Endoprosthetic Reconstruction of Proximal Femur Malignant Lesion Orthobullets Team Pathology - Intramedullary Osteosarcoma Technique Guide Technique guide are not considered high yield topics for orthopaedic standardized exams including the ABOS, EBOT and RC. Endoprosthetic Reconstruction of Proximal Humerus Orthobullets Team Pathology - Intramedullary Osteosarcoma Technique Guide Technique guide are not considered high yield topics for orthopaedic standardized exams including the ABOS, EBOT and RC. Distal Femur Resection with Endoprosthetic Replacement Ahmed Siddiqi Pathology - Intramedullary Osteosarcoma
QUESTIONS 1 of 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Previous Next Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ06.197) A 13-year-old girl presents with right thigh pain and constitutional symptoms for 8 weeks. The patient's serum LDH and alkaline phosphatase are elevated. A radiograph of the right femur is shown in Figure A. Computed tomography (CT) of the chest reveals no pulmonary metastases. Magnetic resonance imaging (MRI) of the right femur shows erosion of the tumor through the cortex into the adjacent soft tissue, but no skip lesions are seen. A biopsy specimen is shown in Figures B and C. What stage does this patient's case most appropriately represent using the Enneking Staging System for Musculoskeletal Tumors? Review Topic QID: 383 FIGURES: A B C 1 IA 1% (10/1802) 2 IB 3% (58/1802) 3 IIA 15% (274/1802) 4 IIB 77% (1383/1802) 5 IIIA 4% (69/1802) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 4 Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ08.159) You are asked to consult on a 8-year-old child in the emergency department with the pathologic fracture seen in Figure A. In preparation for transfer to a sarcoma center for treatment, all of the following are correct steps in the child's management EXCEPT? Review Topic QID: 545 FIGURES: A 1 Pain management 1% (10/1643) 2 Hanging arm sling 2% (41/1643) 3 Tumor staging, including bone scan, CT of chest, MRI of the entire bone 4% (66/1643) 4 Consultation with pediatric oncology 1% (13/1643) 5 Tumor biopsy performed by interventional radiology 92% (1504/1643) ML 1 Select Answer to see Preferred Response PREFERRED RESPONSE 5 (OBQ09.193) Which of the following most accurately lists the most common location of osteosarcoma in decreasing frequency? Review Topic QID: 3006 1 axial skeleton > distal femur > proximal tibia > proximal humerus 1% (19/1356) 2 distal femur > proximal tibia > proximal humerus > axial skeleton 87% (1179/1356) 3 distal femur > axial skeleton > proximal tibia > proximal humerus 1% (15/1356) 4 distal femur > proximal tibia > axial skeleton > proximal humerus 9% (125/1356) 5 proximal tibia > distal femur > axial skeleton > proximal humerus 1% (9/1356) ML 1 Select Answer to see Preferred Response PREFERRED RESPONSE 2 (OBQ08.46) A 19-year-old woman presents with dull right thigh pain for the past 2 months. Radiographs and a biopsy specimen are shown in Figures A-C. What is the most appropriate definitive treatment? Review Topic QID: 432 FIGURES: A B C 1 Nonsteroidal anti-inflammatory drugs with follow-up x-ray in 6 months 3% (33/1218) 2 Intramedullary nailing 1% (8/1218) 3 Intravenous antibiotics 1% (13/1218) 4 Radiation therapy 2% (28/1218) 5 Preoperative chemotherapy, wide resection, and postoperative chemotherapy 93% (1127/1218) ML 1 Select Answer to see Preferred Response PREFERRED RESPONSE 5 (OBQ04.39) A 14-year-old child presents to your office with 6 months of worsening knee pain. Figures A through D show the respective radiographs, bone scan, MRI, and histology. What treatment protocol has been shown to maximize survival in patients with this diagnosis? Review Topic QID: 100 FIGURES: A B C D 1 Neoadjuvant chemotherapy followed by surgical excision 2% (24/1007) 2 Neoadjuvant chemotherapy, surgical excision, adjuvant chemotherapy 85% (858/1007) 3 Surgical excision followed by radiation therapy 3% (27/1007) 4 Neoadjuvant chemotherapy, surgical excision, radiation therapy 7% (73/1007) 5 Surgical excision followed by adjuvant chemotherapy 2% (23/1007) ML 1 Select Answer to see Preferred Response PREFERRED RESPONSE 2 (OBQ06.243) What is the most common site of metastasis for osteosarcoma? Review Topic QID: 254 1 Bone 7% (110/1524) 2 Liver 2% (24/1524) 3 Lung 89% (1355/1524) 4 Kidney 0% (5/1524) 5 Lymph nodes 2% (26/1524) ML 1 Select Answer to see Preferred Response PREFERRED RESPONSE 3 Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ13.70) An 11-year-old boy presents with knee pain, warmth and swelling after a fall. Radiographs, MRI, bone scan and biopsy of the knee are seen in Figures A through E. What is the most appropriate treatment plan? Review Topic QID: 4705 FIGURES: A B C D E 1 Curettage and targeted intravenous antibiotics for 6 weeks. 3% (111/3187) 2 Curettage, cancellous bone grafting, non-weightbearing until visible callus is seen on follow-up radiographs. 8% (243/3187) 3 Curettage, placement of antibiotic beads, intravenous antibiotics for 6 weeks, removal of beads and placement of bone graft substitute at 6 weeks. 4% (118/3187) 4 Neoadjuvant chemotherapy, physeal-sparing resection, intercalary bone allograft, locked plate fixation, postoperative adjuvant chemotherapy. 5% (164/3187) 5 Neoadjuvant chemotherapy, wide resection of the distal one-third of the femur, reconstruction with a custom implant, postoperative adjuvant chemotherapy. 79% (2528/3187) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 5 (OBQ12.175) A 13-year-old boy presents with left leg pain for 10 weeks. He reports a remote history of trauma while falling off of a trampoline 12 weeks ago. He reports constitutional symptoms for the past 4 weeks. The patient's serum LDH and alkaline phosphatase are elevated. A radiograph of the left knee is shown in Figures A and B. A bone scan is displayed in Figure C. Magnetic resonance imaging (MRI) is shown in Figure D and E. A biopsy specimen is shown in Figure F. What is the most appropriate next step in management? Review Topic QID: 4535 FIGURES: A B C D E F 1 Neoadjuvant chemotherapy, surgical excision, adjuvant radiation therapy 11% (378/3529) 2 Surgical irrigation and debridridement followed by 6 weeks of culture directed intravenous antibiotics 5% (168/3529) 3 Surgical excision followed by adjuvant chemotherapy and radiation therapy 7% (237/3529) 4 Neoadjuvant chemotherapy, surgical excision, adjuvant chemotherapy 75% (2647/3529) 5 Surgical irrigation and debridridement with antibiotic cement spacer placement followed by 6 weeks of culture directed intravenous antibiotics 2% (74/3529) ML 3 Select Answer to see Preferred Response PREFERRED RESPONSE 4 (OBQ07.121) A 13-year-old girl presents with knee pain for 2 months especially at night. She denies fevers and weight loss. Her physical exam reveals a painful thigh mass. A radiograph is shown in Figure A. What is the next most appropriate step in managment? Review Topic QID: 782 FIGURES: A 1 Repeat radiographs in 3 months with observation 1% (12/1910) 2 External beam radiation and chemotherapy 0% (6/1910) 3 Surgical biopsy and culture directed intravenous antibiotics 1% (27/1910) 4 Neoadjuvant chemotherapy followed by wide excision and adjuvant chemotherapy 5% (102/1910) 5 MRI of the entire bone, whole body bone scan and CT chest 92% (1755/1910) ML 1 Select Answer to see Preferred Response PREFERRED RESPONSE 5 (OBQ06.78) A 17-year-old male presents with increasing right shoulder pain and swelling. There is no history of trauma and he is otherwise healthy. Representative clinical photograph, radiograph, bone scan, MRI, and histology are shown in Figures A through E. What is the most appropriate treatment for this patient? Review Topic QID: 189 FIGURES: A B C D E 1 Observation 1% (15/2127) 2 Chemotherapy and radiation therapy 2% (47/2127) 3 Surgery alone 14% (296/2127) 4 Surgery and chemotherapy 74% (1583/2127) 5 Surgery and radiation therapy 8% (176/2127) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 4 (OBQ04.164) A 10-year-old boy has 2 months of right knee pain that started at summer camp. The patient denies constitutional symptoms. There is no lymphadenopathy present. CT of the chest shows no signs of metastatic disease. Imaging studies and biopsy results are shown in Figures A-E. What is the most likely diagnosis? Review Topic QID: 1269 FIGURES: A B C D E 1 Synovial sarcoma 1% (12/1432) 2 Malignant fibrous histiocytoma 5% (66/1432) 3 Chondrosarcoma 6% (79/1432) 4 Ewing's sarcoma 9% (124/1432) 5 Osteosarcoma 80% (1147/1432) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 5 (OBQ07.63) In patients with an extremity-based osteosarcoma without metastasis, all of the following are risk factors for disease progression and poor outcomes EXCEPT? Review Topic QID: 724 1 High histologic grade 0% (3/906) 2 Low serum level of alkaline phosphatase at diagnosis 80% (728/906) 3 Large tumor volume 1% (13/906) 4 Inadequate surgical margins following resection 0% (4/906) 5 70% histologic tumor necrosis after pre-operative chemotherapy 17% (153/906) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 2 (OBQ04.7) A 30-year-old man has had leg pain for 6 months. A lesion is identified in the proximal femur and biopsy it taken. Histology is shown in Figure A and is consistent with a low-grade intramedullary osteogenic sarcoma. Additional imaging studies confirm that this is an isolated lesion with no metastasis. What is the standard treatment for this type of lesion? Review Topic QID: 118 FIGURES: A 1 chemotherapy and surgery 57% (264/463) 2 chemotherapy only 0% (2/463) 3 surgery only 30% (141/463) 4 radiation and surgery 11% (52/463) 5 radiation only 0% (2/463) ML 5 Select Answer to see Preferred Response PREFERRED RESPONSE 3 (OBQ10.32) A 16-year-old boy presents with a 6-month history of increasing knee pain and swelling. He is otherwise healthy, but the child has a known retinoblastoma gene mutation. A mass is found on the posterior aspect of his knee, and a biopsy is taken. A radiograph is shown in Figure A. Which of the following biopsy specimens in Figures B through F most likely fits with this patient's history, exam, and radiograph? Review Topic QID: 3120 FIGURES: A B C D E F 1 Figure B 10% (242/2431) 2 Figure C 16% (381/2431) 3 Figure D 12% (280/2431) 4 Figure E 26% (626/2431) 5 Figure F 36% (879/2431) ML 4 Select Answer to see Preferred Response PREFERRED RESPONSE 5 (OBQ11.72) A 8-year-old boy presents with knee pain and an effusion. Biopsy and staging studies show a distal femoral osteosarcoma with contamination of the knee joint. Which of the following treatment options will provide this child with the best chance of local control and the highest level of function? Review Topic QID: 3495 1 Through knee amputation 2% (31/1967) 2 Above knee amputation 16% (321/1967) 3 Rotationplasty 63% (1235/1967) 4 Extra-articular resection, endoprosthetic reconstruction, and free flap coverage 14% (283/1967) 5 Extra-articular resection, allograft prosthetic composite, and free flap coverage 5% (91/1967) ML 3 Select Answer to see Preferred Response PREFERRED RESPONSE 3 (OBQ05.120) A 13-year-old boy is diagnosed with osteosarcoma of his distal femur. The treating surgeon samples the bone marrow from the resection margin of the femur during definitive limb salvage surgery and finds microscopic evidence of tumor. Assuming no change in the resection level, what type of resection would this be considered? Review Topic QID: 1006 1 Intra-lesional 57% (818/1432) 2 Inter-lesional 4% (53/1432) 3 Wide 6% (83/1432) 4 Marginal 31% (445/1432) 5 Radical 2% (29/1432) ML 3 Select Answer to see Preferred Response PREFERRED RESPONSE 1
intra articular versus extra articular resection in osteosarcoma around joint Pathology - Surgical Techniques intra articular resection is a safe procedure when pre op MRI does not sugg... The use of extracorporeally irradiated autografts in pelvic reconstruction following tumour resection Pathology - Surgical Techniques This article is very good update about irradiated autograft in pelvic recon... skip lesions are poor prognostic indicator for osteosarcoma Pathology - Pathology Rounds presence of skip lesions in osteosarcoma. It also indicate existence of dis... Effects of resection margins on local recurrence of osteosarcoma in Pathology - Surgical Techniques this is a meta-analysis that shows the importance of wide margin or radical... Rotationplasty: Beauty is in the Eye of the Beholder Pathology - Surgical Techniques This is very good article which discusses the indication and surgical techn... See More See Less
Upgrade to View Premium Videos Upgrade to View Premium Videos Histopathology of Osteosarcoma - Pathology Rounds Derek Moore General - Intramedullary Osteosarcoma 10/3/2012 500 views
Conventional Osteosarcoma of anterolateral aspect of right proximal tibia in a 30F (C101053) Pathology - Intramedullary Osteosarcoma HPI - The patient was alright 8 months ago when she gradually started to develop pain in her right leg below the knee which was sudden in onset, persistent in nature, non-radiating, worse at night, relieved with painkillers and aggravated by activity. The pain progressive over the period of 8 months associated with swelling which appeared 4 months later below the knee, gradually increased in size, no discharge or redness. No history of trauma, joint pains, backache, morning stiffness, swelling of 1st MTP, swelling in neck, blood in sputum, flank pains, blood in urine, dark coloured stools, fever or weight loss. How would you manage this patient? 3/21/2018 54 0 0 Tibial osteosarcoma in a 12-year-old boy (C1166) Pathology - Intramedullary Osteosarcoma HPI - 12-year-old boy presents with 2 months of knee pain and a limp. Biopsy and staging show high grade osteosarcoma without metastasis. What surgical treatment would you propose for a 12-year-old with a proximal tibial osteosarcoma 3/6/2012 74 1 1