Oncology (Complete) Flashcards
Approach to benign aggressive lesion
- Comprehensive history
- Comprehensive physical
- Radiographs
- Look for neocortex
- Usually epiphyseal/metaphyseal
- Usually lytic
- DDx
- ABC
- (Telangiectactic osteosarcoma) Include in DDx for ABC
- GCT
- CMF
- Osteoblastoma
- Chondroblastoma
- If epiphyseal, DDx includes clear cell chondrosarcoma
- ABC
- MRI
- CXR
- Lung mets
- GCT
- Chondroblastoma
- Biopsy
- Treatment
- Generally, extended intralesional curettage and bone grafting
- ***NOTE:
- Augments include high speed burr, phenol, liquid nitrogen
- ***NOTE:
- En bloc resection and reconstruction
- If eroded through cortex
- Followup
- History and physical examination
- GCT - limb and chest radiographs q3m x 2y, then q6m to 5y, then yearly to 10y
Approach to Osteosarcoma
- Comprehensive history
- Comprehensive physical
- Radiographs
- Ddx
- Osteosarcoma
- Ewing’s
- Infection
- EG
- Hematologic malignancy
- Full length MRI
- Bone scan
- CT chest
- Biopsy
* CT or US guided core needle biopsy OR open - Consult medical oncology
- Prior to chemo:
- BW – LDH, ALP, CBC, LFTs, urea/Cr
- Echo
- Audiogram
- Neoadjuvant chemotherapy
- Doxorubicin, methotrexate, cisplatin
- 10 week course preop
10.Re-stage
- Radiographs
- Full length MRI
- Bone scan
- CT chest
- Surgery
- Limb sparing surgery with wide margin resection and reconstruction
- Tumor prosthesis
- Intercalary allograft/autograft
- Rotationplasty
- APC
- Amputation
- Pathological fracture
- Encasing neurovascular structures
- Poor response to chemo
- Adjuvant chemotherapy
- Doxorubicin, methotrexate, cisplatin
- ?6 months
- Followup (Surveillance)
- History, physical, CXR, extremity x-ray
- Every 3 months for 2 years, 6 months until year 5, then annually until year 10
Approach to Ewing’s Sarcoma
- Comprehensive history
- Comprehensive physical
- Radiographs
- Ddx
- Osteosarcoma
- Infection
- EG
- Hematologic malignancy
- Full length MRI
- Bone scan
- CT chest
- *Bone marrow biopsy
- Biopsy
* CT or US guided core needle biopsy OR open - Consult medical oncology
- Prior to chemo:
- BW – LDH, ALP, CBC, LFTs, urea/Cr
- Echo
- Audiogram
- Neoadjuvant chemotherapy
- *Doxorubicin, Vincristine, Cyclophosphamide, ifosfamide and etoposide
- ~10 week course (4-8 cycles)
- Re-stage
- Radiographs
- Full length MRI
- Bone scan
- CT chest
- Surgery
- Limb sparing surgery with wide margin resection and reconstruction
- Tumor prosthesis
- Intercalary allograft/autograft
- Rotationplasty,
- APC
- Amputation
- Pathological fracture
- Encasing neurovascular structures
- Poor response to chemo
- Lesions of foot or ankle
- Adjuvant chemotherapy
- ?6 months
14. *Radiation if inadequate surgical margins OR surgery would be too morbid or unresectable (pelvis, spine, etc)
15. Followup (Surveillance) - History, physical, CXR, extremity x-ray
- Every 3 months for 2 years, 6 months until year 5, then annually until year 10
Approach to Soft Tissue Sarcoma
- Comprehensive history
- Comprehensive physical
- (Radiographs)
- MRI
- CXR
- CT chest
* If myxoid liposarcoma = CT chest/abdo/pelvis - Biopsy
* US guided core needle biopsy - Consult radiation oncology
- Pre-operative
- Lower dose (~50Gy) over ~5 weeks with surgery ~4 weeks after completion
- Higher wound complication
- Post-operative
- Higher dose (~66Gy)
- More fibrosis and joint contractures
- Surgery
* Wide surgical resection (>1cm margins) - Followup
- History, physical, CXR
- Every 3 months for 1 year, q6months for 1 year, then annually for 10 years
Approach to isolated destructive bone lesion in an adult
- Comprehensive history
- Comprehensive physical
- Radiographs
- Ddx
- Mets
- Myeloma
- Lymphoma
- Primary bone tumor
- Infection
- Bloodwork
- CBC, Lytes, extended lytes, Cr, urea
- ALP, LDH, PTH, LFTs
- SPEP
- ESR/CRP
- PSA
- Urine
- Urinalysis
- UPEP
- Imaging
- Full length radiographs
- Bone scan
- CT chest/abdo/pelvis
- CT/MRI of lesion (full length bone involved)
- Optional:
- Skeletal survey
- Thyroid US
- Mammography
- Biopsy
- CT/US core needle biopsy OR open
8. Treatment of confirmed metastatic bone lesion - +/- preoperative IR embolization for RCC/thyroid mets
- Construct providing immediate stability and protection of entire bone
- IM nail vs. plate
- Possible tumor prosthesis for joint involvement
- +/- cement augmentation for stability
- Local control
- Surgical curettage/resection of bone segment
- Consult radiation oncology for postoperative radiation
- Bisphosphonate
9. Followup
Radiographic assessment of a bone lesion should assess/describe the following factors?
- Type of radiograph (eg. AP/lateral right knee)
- Skeletally immature or mature
- Site of the lesion
- Epiphysis, metaphysis, diaphysis
- Central, eccentric, cortical, periosteal
- Geographic vs. nongeographic border
* Nongeographic = moth-eaten or permeative - Matrix
- Osteoid
- Chondroid (stippled, rings and arcs, flocculent)
- Myxoid
- Fibrous
- Cortex involvement
- Endosteal scalloping
- Thinning
- Expanded
- Neocortex
- Disrupted
- Periosteal reaction
- None
- Continuous (cortical thickening)
- Sunburst (hair-on-end)
- Onion skin
- Codman’s triangle
- Soft tissue mass
- Size and number of lesions
Pediatric aggressive malignant lesions
- Ewing’s sarcoma
- Osteosarcoma
- Infection
- Eosinophilic granuloma
- Hematologic malignancy
- Metastatic tumor (Wilm’s, Neuroblastoma)
Benign Aggressive bone tumour
- ABC
- (Telangiectactic osteosarcoma) Include in DDx for ABC
- GCT
- CMF
- Osteoblastoma
- Chondroblastoma
- If epiphyseal, DDx includes clear cell chondrosarcoma
Lesions in the posterior elements of the spine
- Osteoblastoma
- Osteoid osteoma
- Osteochondroma
- ABC
- Metastasis
Lesions in the epiphysis
- Chondroblastoma
- Clear cell chondrosarcoma
- Geode
- Infection
- EG
Anterior tibial cortical thickening differential?
- Stress fracture
- Osteoid osteoma
- Infection
What are the ‘small round blue cell’ tumours?
LEARN
- Lymphoma
- Ewings
- Acute leukemia
- Rhabdomyosarcoma
- Neuroblastoma
What types of surgical margins can be considered?
[AAOS comprehensive review 2, 2014, pg. 487]
- Intralesional
- Marginal
- Wide
- Radical
Tumors treated with wide resection alone?
[AAOS comprehensive review 2, 2014]
- Chondrosarcoma
- Adamantinoma
- Parosteal osteosarcoma
- Chordoma
What are the most common bone tumours?
[Orthobullets][AAOS comprehensive review 2, 2014]
- Most common malignancy of bone = metastasis
- Most common malignancy of bone in children = intramedullary osteosarcoma
- Most common primary bone malignancy = myeloma
- Most common bone sarcoma = intramedullary osteosarcoma
- Most common soft tissue sarcoma of hand/wrist = epitheliod sarcoma
- Most common soft tissue sarcoma of foot = synovial sarcoma
What are complications of radiation treatment in skeletally immature patients?
- Joint contractures
- Fibrosis
- Growth arrest (LLD)
- Fracture
- Secondary malignancy
What are the syndromes associated with the following tumors?
What are the biopsy principles?
- Incision in line with planned resection incision
* Longitudinal in extremities - Go through muscle compartments (not around)
- Meticulous hemostasis
- Prevents hematoma and tumor spread
- Drain if needed, avoid if possible, place distal in line with incision
- Do not undermine or raise flaps
- Avoid neurovascular structures and joints
- Biopsy soft tissue mass if present
* If not, enter bone through weakest cortex, drill oval/round window if needed - Send frozen section for lesional tissue
- Should also always send fresh tissue
- Lymphoma of bone needs fresh tissue for flow cytometry
- Consider sending for C&S if infection on differential
- Water tight closure
***NOTE: if biopsy bleeds do not extend incision
- Manage bleed with gel foam, packing, cement or drain
What is the differential for an isolated destructive bone lesion in an adult?
- Metastasis
- Multiple myeloma
- Lymphoma
- Primary bone tumours
- Chondrosarcoma
- Malignant fibrous histiocytoma
- Chordoma
- Osteosarcoma
- Benign lesions
* Giant cell tumour - Non-neoplastic
- HyperPTH
- Osteomyelitis
- Gorham vanishing bone disease
- Progressive bone loss (osteolysis) and the overgrowth (proliferation) of lymphatic vessels
Workup for unknown primary?
Undertaken when an adult presents with a destructive bone lesion without a history of cancer
- Must differentiate between metastatic disease and primary bone tumour
1. Bloodwork - CBC, Lytes, extended lytes, Cr, urea
- ALP, LDH, PTH, LFTs
- SPEP
- ESR/CRP
- PSA
- Urine
- Urinalysis
- UPEP
- Imaging
- Full length radiographs
- Bone scan
- CT chest/abdo/pelvis
- CT/MRI of lesion (full length bone involved)
- Optional:
- Skeletal survey
- Thyroid US
- Mammography
- Biopsy
What primary tumors commonly metastasize to bone?
BLT KP
- Breast
- Lung
- Thyroid
- Kidney
- Prostate
Consider preoperative (pre-open biopsy) embolization for which bone lesions?
- Renal cell carcinoma mets
- Thyroid carcinoma mets
What malignant lesions are commonly cold on bone scan?
- Multiple myeloma
- Thyroid mets
- Renal mets
What metastatic cancers are sensitive to radiation and which are resistant?
- Radiosensitive
- Lung
- Breast
- Prostate
- Lymphoma
- Myeloma
- Radioresistant (think cold bone scan)
- RCC
- Thyroid carcinoma
- Melanoma
- GI adenocarcinoma
What nonoperative management can benefit lytic destructive lesion in adult?
Bisphosphonate
What is Mirel’s Classification/Score?
- The goal is to predict impending fractures and prophylactically fix in an elective setting
* Avoids urgent hospitalisation and severe pain associated with pathological fractures and allows for medical optimization to minimize the risk of surgery - Considers
- Site of lesion (UE, LE, trochanteric region)
- Nature of lesion (blastic, mixed, lytic)
- Size of lesion (<1/3, 1/3-2/3, >2/3 of cortex)
- Pain (mild, moderate, functional)
3. According to Mirels’ recommendations: - Score >8 - prophylactic fixation is indicated
- Score <8 - lesion can be managed with radiation or drugs
- Score = 8 - clinical dilemma
- Probability of fracture is 15% and clinician should use clinical judgement
- Sensitivity = 91%, specificity = 35%
* Specificity of 35% may lead to false positives and unnecessary procedures
What are the benefits of prophylactic fixation of a metastatic bone lesion?
[AAOS comprehensive review 2, 2014, pg. 487]
- Avoids urgent hospitalization
- Decreased perioperative pain
- Allows for medical optimization
- Technically easier surgery
- Shorter OR time
- Faster recovery/decreased length of stay
- Allows for coordination with medical oncology
What are the surgical goals and options for the management of metastatic bone disease?
[JBJS 2009; 91(6): 1503]
- Immediate stability, protect the entire bone, reduce pain and increase function
- Local tumor control
* Radiation or local surgical curettage/resection of bone segment - Long bones
- Closed IM nailing preferred
- Without cement if minimal bone destruction
- With cement if significant bone destruction
- Plates if nonWB bone (eg. humerus) or lesion too proximal or distal for nail
- Tumour prosthesis if joint involvement
- Acetabulum
* Harrington technique – threaded pins in ilium as rebar support for cemented acetabular component
What is the management of massive bleeding during local tumor control (eg. RCC)?
[CORF]
- Remove tumor as fast as possible
- Be prepared for blood loss – have cement available
- Notify anaesthesia
- Call for blood products
When can a solitary destructive bony lesion be nailed?
- Known metastatic malignancy
- Frozen section sent at time of surgery confirming ‘carcinoma’
What is the management of hypercalcemia of malignancy?
[Am Fam Physician. 2003 May 1;67(9):1959-1966.]
- Recognize symptoms
- “Stones, bones, abdominal moans, and psychic groans”
- Confusion, malaise, fatigue*
- Abdominal pain, nausea*
- ECG
- Hydration
- Insert Foley
- Bolus IV normal saline 1-2L, then run freely to achieve urine output of 150-200cc/h
- Loop diuretic (eg. Lasix)
* Start once intravascular volume restored - Medicine consult
- Bisphosphonate
- Calcitonin
- Dialysis
What type of resection is required when a bone sarcoma involves a joint?
Extra-articular resection
- E.g. knee involvement is performed either by en-block resection or resection with preservation of the extensor mechanism (splitting the patella and detaching suprapatellar pouch from quads tendon and fat pad from patellar tendon)
Hemipelvectomy:
What is the difference between an internal vs. external hemipelvectomy?
What 3 structures must be considered when deciding between internal and external hemipelvectomy?
What are flap closure options for hemipelvectomy?
- Internal vs External
- Internal – limb-sparing surgery
- Hemipelvis resected, leg preserved
- External – hindquarter amputatio
- Hemipelvis and leg amputated
- Important structures
- Sciatic nerve
- Femoral neurovascular bundle
- Hip joint
- ***General rule = should two of these structures require resection to obtain an adequate margin, then external hemipelvectomy should be performed
3. Flap closure options: - Anterior flap – femoral blood supply
- Indicated if tumor involves buttock or internal iliac vessels
- Posterior flap (classic) – internal iliac blood supply
- Indicated if tumor involves external iliac or femoral vessels
- Free flap
Osteoid Osteoma
Classification
Age
Presentation
Location
Imaging
Treatment
DDx
- Classification - Benign active
- Age = 5-30
- Presentation:
- Classically night pain relieved with ASA or NSAIDs
- May cause a painful scoliosis
- If so lesion located at the centre of the concavity of the curve
- Location:
* Most common = proximal femur - Imaging:
* Radiographs = round, well-circumscribed intracortical lesion with radiolucent nidus, surrounding reactive sclerosis, benign periosteal reaction- Nidus is always less than 1.5cm (sclerosis may extend beyond)
* CT (thin slice) = identifies radiolucent nidus (often key to diagnosis)
* MRI = also can show nidus as well as adjacent edema (not needed routinely)
- Nidus is always less than 1.5cm (sclerosis may extend beyond)
- Treatment
- Expectant observation and NSAIDs
- Pain is self-limiting treated with NSAIDs, burns out on average in 3 years
- Radiofrequency ablation (RFA)
- Failure of NSAIDs
- Contraindicated if adjacent to nerve roots or spinal cord
- Recurrence = 10-15%
- Surgical resection/currettage
- Indicated if close to spinal cord/nerve root/skin, painful scoliosis, digits
- Differential for cortical osteoid osteoma
- Indicated if close to spinal cord/nerve root/skin, painful scoliosis, digits
- Cortical bone abscess
- Stress fracture (linear radiolucency)
- Intracortical osteosarcoma
- Osteoblastoma (>2cm)
- Differential for an intramedullary osteoid osteoma
- Brodies abscess
- Osteoblastoma
- Bone island
Osteoblastoma
Classification
Age
Presentation
Location
Imaging
Treatment
DDx
- Classification - Benign aggressive
- Age = 10-30
- Presentation
- Slow, progressive dull, aching pain
- Differs from osteoid osteoma in that it is less severe, not night pain, not relieved with ASA
- Location
- Most common = posterior elements of the spine
- 2/3 are cortically-based, 1/3 are medullary-based
- Imaging
- Radiographs = radiolucent nidus >2cm
- Surrounding reactive sclerosis
- Expansile with neocortex
- CT = indicated to evaluate extent of lesion
- Treatment
- Currettage and bone grafting or en bloc resection
- Not self limiting so observation not indicated
- Differential diagnosis
- Osteoid osteoma
- Brodies abscess
- ABC
- Osteosarcoma