Download MBBS Orthopaedics PPT 12 Malignant Bone Tumors Lecture Notes

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Orthopaedics PPT 12 Malignant Bone Tumors Lecture Notes


Malignant bone tumors

Classification (W.H.O.)

? Bone-forming tumours
? Cartilage forming tumours
? Giant-cell tumour
? Marrow tumours
? Vascular tumours
? Secondary malignant tumours of bone
Bone forming tumors

? Benign-

Osteoma

Osteoid osteomaor osteoblastoma

? Intermediate - Aggressive osteoblastoma

? Malignant ?

Osteosarcoma Central (Medullary) and Peripheral (Surface)

Parosteal

Periosteal

High grade surface

Cartilage forming tumors

Benign ?

Malignant -

? Chondroma/Enchondroma

? Chondrosarcoma

? Osteochondroma

? Differentiated chondrosarcoma

? Chondroblastoma

? Juxtacortical chondrosarcoma

? Chondromyxoid fibroma

? Mesenchymal chondrosarcoma
? Clear cell chondrosarcoma
Giant cell tumor

? Osteoclastoma

Marrow tumors

? Ewing's sarcoma

? Neuroectodermal tumour

? Malignant lymphoma of bone (Primary/secondary)

? Myeloma
Vascular tumors

Benign

? Haemangioma

? Lymphangioma

? Glomus tumour

Intermediate

? Haemangio endothelioma

? Haemangio pericytoma

Malignant

? Angiosarcoma

? Malignant haemangio pericytoma

Secondary

Metastasis to bone from
? Thyroid
? Breast
? Bronchus
? Kidney
? Prostate
APPROACH TO DIAGNOSIS OF MALIGNANT

BONE TUMOR
Multi phased work up
Steps
? History
? Local examination
? Laboratory test
? Radiological test
? Histopathological examination

History

? Age- some tumors are very age specific. Eg- Ewing sarcoma 10-20yrs;

osteosarcoma 15-25yrs and > 45yrs (bimodal); chondrosarcoma

>45yrs; multiple myeloma >50yrs.

? Non specific

? Dull aching painful lump

? Pathological fracture

? Sometimes as incidental finding

? H/o exposure to radiation and chemical carcinogens

? History of any malignancy anywhere in body or treatment history for

any malignancy at present or past
Examination

? Swelling- tenderness, location, shape, consistency, fixity to skin and

adjacent structure, mobility, skin over swelling , dilated or engorged

veins.

? Joint range of movement limitation
? Sign of inflammation may be present
? Any other skin lesion anywhere else in the body
? Regional lymph node
? Systemic examination to diagnose primary tumor in case of

metastasis

Laboratory

? Hemogram

? Lactate dehydrogenase

? Erythrocyte sedimentation rate

? Parathormone

? C- reactive protein

? Urinary Bence Jones protein

? Serum calcium

? Urinary 24hrs calcium

? Serum phosphorus

? Electrophoresis

? Alkaline phosphatase

? Bone marrow examination
Hemogram and ESR

? Anaemia may be seen
? To rule out infection, myeloma and leukemia.
? ESR is raised particularly in
Metastasis

Ewing's sarcoma
Lymphoma
Leukemia

S calcium and phosphorus

? Hypercalcemia is most common metabolic complication of metastatic

bone disease.

? Increased level than normal indicates

Metastasis
Myeloma
Hyperparathyroidism
S alkaline phosphatase

? Raised alkaline phosphatse indicates high turn over of the bone
? Raised in osteoblastic lesion

Blastic metastasis from prostate and breast
Active Paget's disease
Hyperparathyroidism

Radiological tests

? X-ray

? Chest X-ray

? CT scan

? CT thorax, abdomen and pelvis

? MRI

? Mammography

? Bone scan

? Thyroid scan

? PET scan

? Arteriogram
OSTEOSARCOMA

o Characterized by the production of osteoid by malignant cel s.

o It is the second most common primary malignant tumor of bone, accounting for approximately 20% of

primary bone cancers.

o The most common nonhematologic primary malignancy of bone

o Onset can occur at any age; however, primary high-grade osteosarcoma occurs most commonly in the second

decade of life.

o Parosteal osteosarcoma has a peak incidence in the third and fourth decades.
o Arise from multipotent mesenchymal cel s
Clinical y

? Radiographic appearance of osteosarcoma can vary

? lesion can be either predominantly blastic or predominantly lytic

? The lesion usually is quite permeative, and the borders are ill defined.

? May take the form of a "Codman triangle," or it may have a "sunburst" or

"hair-on-end" appearance.

? Magnetic resonance imaging (MRI)

? They may be primarily osteoblastic, fibroblastic, or chondroblastic

Plain X-ray (Most valuable)

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Lytic

sclerotic

Mixed (most common)
Plain X-ray

22

Lesions are usual y permeative

Associated with destruction of the cancel ous a n

d

cortical elements of the bone

Ossification within the soft tissue component, if

tumour has broken through cortex

Intra medullary
Borders are ill defined

Plain X-ray

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Periosteal reaction may appear as the characteristic Codman triangle.

Classification:

PRIMARY OSTEOSARCOMAS are

Conventional /classic osteosarcoma (high grade, intra medullary)
Low-grade intramedul ary osteosarcoma

Parosteal osteosarcoma

Periosteal osteosarcoma

High-grade surface osteosarcoma

Telangiectatic osteosarcoma, and

Small cell osteosarcoma.

Classification:

SECONDARY OSTEOSARCOMAS

Osteosarcomas occurring at the site of another disease process.
more common in >50 years of age
The most common causes are

Paget disease
Previous radiation treatment

Other associated conditions are

Fibrous dysplasia Bone infarcts
Osteochondromas Chronic
osteomyelitis
Dedifferentiated chondrosarcomas
Osteogenesis imperfecta
Conventional Osteosarcoma

? High grade
? Common type of Osteosarcoma

? Common radiographic appearance is

aggressive lesion producing osteoid matrix

? Periosteal reaction may take the form of

"codmans triangle" or "sunbrust" or "hair

on end" appearence

Periosteal Osteosarcoma

? Intermediate grade

? Arises from surface of bone

? Commonly on femur and tibia.
Intramedul ary Osteosarcoma

q Rare
q Low grade

Parosteal Osteosarcoma
? Low grade malignancy
? Rare
? Arises on surface of bone and invades

medulary cavity only at later stages.

? It has peculiar tendency to occur as a

lobulated mass on the posterior aspect of
femur
High grade surface Osteosarcoma

? High grade
? Least Common
? Radiographs show invasive lesions with

ill defined borders

Telangectic Osteosarcoma

Lytic lesion
Smal cell Osteosarcoma

? Rare
? High grade
? Resemble Ewing sarcoma or Lymphoma

Treatment

Current standard of care

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Radiological staging

Biopsy to confirm diagnosis Preoperative

chemotherapy

Repeat radiological staging (access chemo response, finalize surgical treatment plan)

Surgical resection with wide margin

Reconstruction using one of many

techniques

Post op chemo based on preop response
Chondrosarcoma

? 9% of primary malignancies of bone
? Age: broad, primary chondrosarcoma peak around 40 ? 60yrs, secondary chondrosarcoma

25 ? 45 yrs.

? Any location but common around pelvis, proximal femur, proximal humerus.
? Most common malignancy in hand.
? Clinical y: increasing pain and palpable mass.
? Pain in absence of pathological fracture is helpful to dif erentiate between enchondroma

and low grade chondrosarcoma

Secondary Chondrosarcoma

? Olliers disease (multiple enchondromatosis)

? Maffuci syndrome (multiple enchondromatosis + soft tissue haemangioma)
? Multiple hereditary exostoses
? Solitary osteochondroma
? Synovial chondromatosis
? Chondromyxoid fibroma
? Periosteal Chondroma
? Chondroblastoma
? Previous radiation treatment Firbours dysplasia
Chondrosarcoma - xrays

? Appearence similar to enchondroma,
it is a lesion arising in medulary cavity with irregular
matrix calcification.
? Pattern is described as "punctate," "popcorn," or

"comma-shaped".

? Compared with enchondroma,
chondrosarcoma has more aggressive appearence
with bone destruction and cortical erosions,
periosteal reaction, and rarely soft-tissue mass.
Mesenchymal chondrosarcoma
Clear cell chondrosarcoma

Epiphyseal Gaint Cel Tumor

Chondroblastoma

Clear cel chondrosarcoma

Dedifferentiated chondrosarcoma

Radiographic features of dedif erentiated chondrosarcoma often

show a more aggressive radiolucent area juxtaposed on a

otherwise typical chondrosarcoma.
POP CORN CALCIFICATION

DIFFERENCE FROM ENCHONDROMA

o Endosteal scal oping of more than 2/3rd of cortical thickness- chondrosarcoma

o Aggressive changes such as cortical erosion , bone destruction, periosteal reaction, soft

tissue mass- chondrosarcoma

o size> 5 cm in axial skeleton- predictor of malignancy

o Apperance of lysis in previously calcified area- malignancy
Intramedullary ,soft

tiisue extention of tumour

with calcification

Chondrosarcomas Treatment

? Low grade ? Extended curettage with use of intraoperative adjuvant

treatment.

? High grade ? Wide or radical resection or amputation.


? Radiotherapy as palliative for inaccessible lesions.

Ewing's Sarcoma

Ewing sarcoma, a highly malignant neoplasm

Third most common nonhematologic primary malignancy of bone

The second most common in patients younger than 30 years of age and the

most common in patients younger than 10 years of age

Ewing's sarcoma

Approximately 90% of Ewing sarcomas occur before age 25

Histogenesis: neurally derived small round cel malignancy very similar to the

so-called primitive neuroectodermal tumor (PNET)

Disease is extremely rare in black persons
Areas of

involvement

Clinical presentation

Present as a localized painful mass

With systemic symptoms such as fever, malaise, weight loss, and

An increased erythrocyte sedimentation rate.

These systemic symptoms may lead to an erroneous diagnosis of osteomyelitis.
Radiological features

lesion is poorly defined,

Marked by a permeative or moth-eaten type of bone destruction,

Associated with an aggressive periosteal response that has an onionskin (or

"onion peel")

less commonly, a "sunburst" appearance,

Large soft tissue mass, Occasionally, the bone lesion itself is almost

imperceptible, with the soft-tissue mass being the only prominent radiographic

finding

Radiological

Features

Onion skin appearance

MRI

1. T1 : low to

intermediate signal

2. T1 C+ (Gd) :

heterogeneous but

prominent

enhancement

3. T2 : heterogeneously

high signal, may see

hair on end low signal

striations
Nuclear medicine:

Ewing sarcomas demonstrate increased uptake on both

Gallium-citrate and

Technetium99m methylene diphosphonate scans
Differential diagnosis

other Ewing sarcoma family of tumours

pPNET : large soft tissue component with extension into bone

Askin tumour : chest wall

osteosarcoma (ALP is not elevated in Ewing sarcoma)

Leukemia

Multiple myeloma

Ostyeomyelitis
Ewing sarcoma ? treatment
? Radiosensitive

? Large central unresectable mass ? radiotherapy.

? Smaler more accessible lesions surgery.

? Neo adjuvant and adjuvant chemotherapy

This post was last modified on 07 April 2022