BONE
JOINT
SOFT TISSUE
Modeling/RE-modeling
CELLS of BONE• OSTEOPROGENITOR (“STEM”)(TGFβ)• OSTEOBLASTS (surface of spicule), under
control of calcitonin to take blood calcium and put it into bone.
• OSTEOCYTES (are osteoblasts which are now completely surrounded by bone)
• OSTEOCLASTS (macrophage lineage), under control of PTH to chew up the calcium of bone and put it into blood
Proteins (organic) of BONE• Type 1 (TYPE [B]ONE) collagen (90%)• Cell adhesion proteins, i.e. CAMs: Osteopontin,
fibronectin, thrombospondin• Calcium-binding proteins: Osteonectin, sialoprotein• Proteins involved in mineralization: Osteocalcin • Enzymes: Collagenase, Alk. Phos.• Growth factors
– IGF-1, TGF-β, PDGF
• Cytokines– Prostaglandins, IL-1, IL-6, RANKL
• Proteins Concentrated from Serum– β2 –microglobulin Albumin– IGF, insulin-like growth factor– TGF, transforming growth factor– PDGF, platelet-derived growth factor– IL, interleukin– RANKL, RANK ligand
Minerals (IN-organic) of BONEHYDROXY-APATITE
Ca5(PO4)3(OH) Ca10(PO4)6(OH)2
ADJECTIVES of BONE•Compact
– Dense– Cortical
•Spongy– Cancellous– Membranous– Endosteal– Spicular
Woven vs. “Lamellar”
-BLASTS/-CLASTS
Ca++ PTH
Ca++ Calcitonin
BONE DISEASES• 1) MALFORMATIONS AND DISEASES CAUSED BY DEFECTS IN NUCLEAR PROTEINS
AND TRANSCRIPTION FACTORS, polydactyly, syndactyly, absence of a bone• 2) DISEASES CAUSED BY DEFECTS IN HORMONES AND SIGNAL TRANSDUCTION
MECHANISMS, achondroplasia, thanatophoria• 3) DISEASES ASSOCIATED WITH DEFECTS IN EXTRACELLULAR STRUCTURAL
PROTEINS– Type 1 Collagen Diseases (Osteogenesis Imperfecta)– Types 2, 10, and 11 Collagen Diseases
• 4) DISEASES ASSOCIATED WITH DEFECTS IN FOLDING AND DEGRADATION OF MACROMOLECULES
– Mucopolysaccharidoses• 5) DISEASES ASSOCIATED WITH DEFECTS IN METABOLIC PATHWAYS (ENZYMES,
ION CHANNELS, AND TRANSPORTERS)– Osteopetrosis
• 6) DISEASES ASSOCIATED WITH DECREASED BONE MASS– Osteoporosis
• 7) DISEASES CAUSED BY OSTEOCLAST DYSFUNCTION– Paget Disease (Osteitis Deformans)
• 8) DISEASES ASSOCIATED WITH ABNORMAL MINERAL (Ca++) HOMEOSTASIS– Ricketts and Osteomalacia– Hyperparathyroidism– Renal Osteodystrophy
1) MALFORMATIONS AND DISEASES CAUSED BY DEFECTS IN NUCLEAR PROTEINS AND “TRANSCRIPTION FACTORS”
proteinDNAmRNA
• Congenital absence of a, usually single, bone: phalanx, rib, clavicle
• Supernumerary digit (polydactyly)
• Syndactyly
• CRANIORACHISCHISIS
2) DISEASES CAUSED BY DEFECTS IN HORMONES AND
SIGNAL TRANSDUCTION MECHANISMS
• Achondroplasia, dwarf (non-lethal)• Thanatophoria, dwarf (lethal, FGF-3
mutations)
• a point mutation (usually Arg for Gly375) in the gene that codes for FGF receptor 3 (FGFR3), which is located on the short arm of chromosome 4. In the normal growth plate, activation of FGFR3 inhibits cartilage proliferation, hence the term “achondroplastic”;
• A MUTATION causes FGFR3 to be constantly activated.
Short arms and extra folds of skin
Achondroplastic “dwarf” Thanatophoric “dwarf”, often lethal
3) DISEASES ASSOCIATED WITH DEFECTS IN EXTRACELLULAR
STRUCTURAL PROTEINS• OSTEOGENESIS IMPERFECTA TYPES• (“Brittle” bone disease, too LITTLE bone),
BLUE sclerae• Mutations in genes which code for the
alpha-1 and alpha-2 chains of COLLAGEN 1• Mutations of COLLAGEN 2,10, 11 manifest
themselves as CARTILAGE diseases, ranging from joint cartilage destruction to fatal sequelae
Osteogenesis Imperfecta
BLUE SCLERA
4) DISEASES ASSOCIATED WITH DEFECTS IN FOLDING AND
DEGRADATION OF MACROMOLECULES(glycosaminoglycans)
• MUCOPOLYSACCHARIDOSIS (one of MANY lysosome storage diseases)
• DECREASES in ENZYMES which degrade:– DERMATAN
– HEPARAN
– KERATAN
• Chiefly CARTILAGE disorders: short, chest wall, malformed bones
MUCOPOLYSACCHARIDOSES
5) DISEASES ASSOCIATED WITH DEFECTS IN METABOLIC
PATHWAYS (ENZYMES, ION CHANNELS, AND TRANSPORTERS)
• OSTEOPETROSIS, 4 types
• One common one has a CARBONIC
ANHYDRASE deficiency, i.e., ↓ acid
• DECREASED osteoclast resorption
• “MARBLE” bone, increased bone, brittle, sclerotic bone
OSTEOPETROSIS
6) DISEASES ASSOCIATED WITH DECREASED BONE MASS
•OSTEOPOROSIS• “PEAK” bone mass is early adulthood• Normal decline, slow• Osteoporosis is accelerated bone loss• Factors:
– AGE– Physical activity– Estrogen withdrawal (menopause)– Nutrition (Ca++)– Genetics
Categories of Generalized OsteoporosisPrimary
Postmenopausal Idiopathic
Senile
Secondary
Endocrine disorders Rheumatologic disease
Hyperparathyroidism Drugs
Hypo-hyperthyroidism Anticoagulants
Hypogonadism Chemotherapy
Pituitary tumors Corticosteroids
Diabetes, type 1 Anticonvulsants
Addison disease Alcohol
Neoplasia MiscellaneousMultiple myeloma Osteogenesis imperfecta
Carcinomatosis Immobilization
Gastrointestinal Pulmonary disease
Malnutrition, Malbs., Hepatic Insuf., Vit C,D Homocystinuria
Anemia
OSTEOPOROSIS
7) DISEASES CAUSED BY OSTEOCLAST DYSFUNCTION
Paget Disease (Osteitis Deformans)
• Matrix madness, Osteoblasts/-cytes gone wild• THREE PHASES:
– 1) Increased osteoclast resorption– 2) Increased “hectic” bone formation (osteoblasts)– 3) Osteosclerosis
• ELEVATED ALKALINE-PHOSPHATASE • ELEVATED urine HYDROXYPROLINE
PAGET’s DISEASE (of BONE)
85% MONOSTOTIC, WHOLE BONE
15% POLY-OSTOTIC (skull, pelvis)
“JIGSAW”, NOT LAMINAR, BONE
CLINICAL: PAIN!!!
(MICROFRACTURES)
PAGET’s DISEASE
NON-Lamellar bone
8) DISEASES ASSOCIATED WITH ABNORMAL MINERAL
HOMEOSTASIS– Ricketts and Osteo”malacia”
• VITAMIN D deficiency/dysfunction– Hyperparathyroidism, PRIMARY (PTH ADENOMA)
• ENTIRE SKELETON• OSTEITIS FIBROSIS CYSTICA (von Recklinghausen’s
disease (of bone)• “BROWN”* TUMOR
– Hyperparathyroidism, SECONDARY (RENAL) (NOT AS SEVERE AS 1º)
– Renal Osteodystrophy = ANY bone disorder due to chronic renal disease
PRIMARY HYPERPARATHYROIDISM
OSTEITIS FIBROSA CYSTICA
“BROWN” “TUMOR”
RENAL OSTEODYSTROPHY
• PHOSPHATE RETENTION
• HYPOPHOSPHATEMIA
• HYPOCALCEMIA
• INCREASED PTH
• INCREASED OSTEOCLASTS
• METABOLIC ACIDOSIS release of HYDROXYAPATITES from matrix
FRACTURES
FRACTURES, adjectives
• Complete, incomplete
• Closed, open (communicating)
• Communited (splintered, “greenstick”)
• Displaced (NON-aligned)
• PATHOGENIC, (non-traumatic, 2º to other disease, often metastases)
• “STRESS” fracture
FRACTURES• THREE PHASES
– HEMATOMA, minutes days PDGF, TGF-β, FGF– SOFT CALLUS (“PRO”-CALLUS), ~1 week– HARD CALLUS (BONY CALLUS), several weeks
• COMPLICATIONS– PSEUDARTHROSIS (non-union)– INFECTION (especially OPEN [communicating]
fractures)
FRACTURES
OSTEONECROSIS• Also called AVASCULAR necrosis• Also called ASEPTIC necrosis
• CAUSE: ISCHEMIA– Trauma– Steroids– Thrombus/Embolism– Vessel injury, e.g., radiation– INCREASED intra-osseous pressurevascular
compression– Venous hypertension too
OSTEONECROSISDisorders Associated with Osteonecrosis
Idiopathic Pregnancy
Trauma Gaucher disease
Corticosteroid administration
Sickle cell and other anemias
Infection Alcohol abuseDysbarism Chronic pancreatitis
Radiation therapy Tumors
Connective tissue disorders
Epiphyseal disorders
OSTEONECROSIS
OSTEONECROSIS
OSTEOMYELITIS• Pyogenic: Staph, E. coli, Pseudom, Kleb,
Salmonella
– Hematogenous
– Contiguous, e.g., from a nearby joint
– Direct implantation
• TB
• Syphilis
OSTEOMYELITIS• DX: X-ray, Bone scan
OSTEOMYELITIS• DX: Histology
OSTEOMYELITIS• COMPLICATIONS
– Subperiosteal abscess
– Draining sinus
– Joint involvement
• SEQUESTRUM (dead bone)
vs.
• INVOLUCRUM (new bone)
OSTEOMYELITIS• Tuberculous
– Usually blood borne– TB of spine is known as POTTS
disease
• Syphilis– CONGENITAL– TERTIARY, “SABRE” shins
POTT’s DISEASE
SABER SHINS
Classification of Primary Tumors Involving BonesHistologic Type Benign MalignantHematopoietic (40%) Myeloma
Malignant lymphomaChondrogenic (22%) Osteochondroma Chondrosarcoma
Chondroma Dedifferentiated chondrosarcoma
Chondroblastoma Mesenchymal chondrosarcoma
Chondromyxoid fibroma
Osteogenic (19%) Osteoid osteoma Osteosarcoma
OsteoblastomaUnknown origin (10%) Giant cell tumor tumor
Giant cell tumorAdamantinoma
Histiocytic origin Fibrous histiocytoma Malignant fibrous histiocytoma
Fibrogenic Metaphyseal fibrous defect (fibroma) Desmoplastic fibroma
FibrosarcomaNotochordal ChordomaVascular Hemangioma Hemangioendothelioma
HemangiopericytomaLipogenic Lipoma LiposarcomaNeurogenic Neurilemmoma
BONE TUMORS• BONE
• CARTILAGE
• FIBROUS
• MISC.–Ewing’s “sarcoma”
–Giant Cell Tumor
–METASTASES
BONE- BONE TUMORS
• OSTEOMA
• OSTEOID OSTEOMA (nidus)
• OSTEOBLASTOMA
• OSTEOSARCOMA (OSTEOGENIC SARCOMA)
OSTEOMA• SOLITARY
• MIDDLE AGE
• FROM SUBPERIOSTEAL or ENDOSTEAL surfaces
• SKULL, FACE, most common
• Totally BENIGN
• To be distinguished from REACTIVE BONE, (can be difficult)
Why am I not showing you HISTOLOGY?
FRONTAL SINUS
OSTEOID OSTEOMA• At least 2 cm in diameter
• Teens, twenties, APPENDICULAR skeleton
• M>>F
• PAINFUL
• Has a NIDUS• Responds to aspirin
• Induces a MARKED bony reaction
NIDUS
OSTEOBLASTOMA• AXIAL SKELETON, i.e., SPINE
• NO nidus
• NO bony reaction
• NOT relieved by aspirin
OSTEOSARCOMA(OSTEOGENIC SARCOMA)
LATE TEENSKNEESMETAPHYSESPAINFUL!!!
TYPES of OSTEOSARCOMAS• The anatomic portion of the bone from which they
arise (intramedullary, intracortical, or surface) • Degree of differentiation • Multicentricity (synchronous, metachronous[NOT
synchronous]) • Primary (pre-existing bone is unremarkable) or
secondary (e.g., osteosarcoma associated with pre-existing disorders such as benign tumors, Paget disease, bone infarcts, previous irradiation)
• Histologic variants (osteoblastic, chondroblastic, fibroblastic, telangiectatic, small cell, and giant cell)
The most common subtype is osteosarcoma that arises in the metaphysis of long bones; is primary, solitary, intramedullary, and poorly differentiated; and produces a predominantly bony matrix
BONE- CARTILAGE TUMORS
• OSTEOCHONDROMA (EXOSTOSIS)
• CHONDROMA
• CHONDROBLASTOMA
• CHONDROMYXOID FIBROMA
• CHONDROSARCOMA
OSTEOCHONDROMA (EXOSTOSIS)
• Common, Cartilage AND Bone present
• Often MULTIPLE as a hereditary syndrome
• M>>>F
• PELVIS, SCAPULAE, RIBS
CHONDROMA• Chondroma vs. EN-chondroma• PURE Hyaline Cartilage• MULTIPLE enchondromas = Ollier’s dis.• Maffucci Synd. if hemangiomas present
CHONDROBLASTOMA• RARE, in teenagers
• M>>F
• KNEES, usually
• Epiphyses
• MUCH LESS matrix than a chondroma
CHONDROMYXOID FIBROMA• RAREST of all• TEENS, MALES• “MYXOID” concept• “ATYPIA”
CHONDROSARCOMA• ANATOMY
– INTRAMEDULLARY– JUXTACORTICAL
• HISTOLOGY– CONVENTIONAL
• HYALINE• MYXOID
– CLEAR– DE-DIFFERENTIATED– MESENCHYMAL
CHONDROSARCOMA
BONE- FIBROUS TUMORS
• FIBROUS CORTICAL DEFECT/NON-OSSIFYING FIBROMA
• FIBROUS DYSPLASIA
• FIBROSARCOMA/MALIGNANT FIBROUS HISTIOCYTOMA
FIBROUS CORTICAL DEFECT• COMMON, usually LESS
THAN 1 CM
• CHILDREN >2
• IF MORE THAN 5-6 CM, they are then called NON-OSSIFYING FIBROMA
FIBROUS “DYSPLASIA”• BENIGN TUMOR
• THREE TYPES– SINGLE BONE (70%)
– POLY-OSTOTIC (27%)
– POLY-OSTOTIC (3%) with café-au-lait and endocrine disorders, especially precocious puberty
1) CURVED thin spicules
2) LACK of osteoblastic “rimming”
FIBROSARCOMA/MFH
• METAPHYSES of LONG BONES
• PELVIC FLAT BONES
• LYTIC
• FRACTURES
• OF COURSE, SARCOMATOUS METASTASIS
FIBROSARCOMA/MFH
MISC. TUMORS of BONE
• EWING sarcoma/PNET
(Primitive NeuroEctodermal
Tumor)
• GIANT CELL TUMOR
• METASTASES
EWING/PNET• SAME TUMOR
• SMALL ROUND BLUE CELL TUMOR
• NEUROENDOCRINE CELL ORIGIN
• CHROMOSOME TRANSLOCATION 11&22
• SECOND most COMMON bone malignancy in CHILDREN
• ARISE IN MEDULLARY CAVITY of BONE
• LOOK LIKE LYMPHOMA
GCT (Giant Cell Tumor), BONE
METASTASESMALE: PROSTATEFEMALE: BREASTRENAL, THYROID also seek bone early also
LYTIC?BLASTIC?
SYNOVIAL JOINTS
TWO KINDS of cells form the synovial intima
• 1) fibroblasts– Hyaluronin
– Lubricin
• 2) macrophagesThe SUB-intima is loose CT or fat
JOINT DISEASES•“ARTHRITIS”
–DEGENERATIVE (OSTEOARTHRITIS)
–RHEUMATOID– “JUVENILE” RHEUMATOID– NON-INFECTIOUS: Ankylosing Spond.,
Reactive, Psoriasis, IBD– INFECTIOUS: Supp., TB, Lyme, Viral– GOUT (URATE)– PSEUDOGOUT (PYROPHOSPHATE)
• Tumors (all are of synovium)– Ganglion (Synovial Cyst), non-neoplastic– Giant Cell Tumor (Pigmented VilloNodular Synovitis[PVNS]), benign– Synovial Sarcoma, malignant
“DEGENERATIVE” ARTHRITISaka, “OSTEO”ARTHRITIS
• Etiology/Risk Factors: Age, Trauma, Genes
• Pathogenesis: Progressive EROSION of articular cartilage
• Morphology: X-Ray, “eburnation”, “joint mice”, osteophytes
• Clinical Expression: PAIN, Limitation of motion
HEBERDEN’S NODES
DIP, NOT MP or PIP
RHEUMATOID ARTHRITIS Rheumatoid arthritis (RA) is a
chronic systemic inflammatory disorder that may affect many tissues and organs—skin, blood vessels, heart, lungs, and muscles—but principally attacks the joints, producing a nonsuppurative proliferative and inflammatory synovitis that often progresses to destruction of the articular cartilage and ankylosis of the joints.
TWO KINDS of cells form the synovial intima
• 1) fibroblasts– Hyaluronin
– Lubricin
• 2) macrophagesThe SUB-intima is loose CT or fat
RHEUMATOID ARTHRITIS• Etiology/Risk Factors: Autoimmune
• Pathogenesis: Progressive SYNOVITIS
• Morphology: Synovial lymphocytes, macrophages, plasma cells, neutrophils,
osteoclasts, “pannus”, hyperemia, rheumatoid “nodules”, vasculitis
• Clinical Expression: PAIN, Limitation of motion, malaise, fatigue, rheumatoid factor IgMIgG-Fc,
The rheumatoid “nodule” shows “palisading” fibroblasts
HANDSWRISTELBOWS
DIAGNOSIS• CLINICAL FEATURES (1% of population F>>M)
– MORNING STIFFNESS, MEAN AGE 45 YRS– ARTHRITIS in MORE THAN 3 JOINT AREAS– “TYPICAL” hand findings, MP ULNAR deviation– SYMMETRIC ARTHRITIS– SERUM RHEUMATOID FACTOR– “TYPICAL” X-RAY findings
“JUVENILE” Rheumatoid Arthritis
• Begins BEFORE age 16, by definition
• Generally LARGER joints than RA
• Often POSITIVE ANA
“SERONEGATIVE” ARTHRITIDES• ANKYLOSING SPONDYLITIS (aka,
“rheumatoid” spondylitis, or Marie-Strumpell Disease [HLA-B27] (M>>F)
• “REACTIVE” ARTHRITIS (FOLLOWS GU or GI INFECTIONS)– REITER SYDROME (urethral &
conjunctival inflammation too) [HLA-B27]
– Arthritis associated with IBD
• PSORIATIC ARTHRITIS [HLA-B27]
Ankylosing Spondylitis
INFECTIOUS ARTHRITIS• From OSTEOMYELITIS• USUALLY SUPPURATIVE
• GC, staph, strep, H. flu, E. coli, (Salmonella in sicklers)
• 4 cardinal signs, fever,
leukocytosis, ESR
INFECTIOUS ARTHRITIS• TB• LYME Disease, i.e., Borrelia
burgdorferi, from Ixodes ticks• VIRAL
–Parvovirus B19–Rubella–Hepatitis C
GOUT• Endpoint of HYPERURICEMIA from
ANY cause resulting in JOINT deposition of monosodium urate crystals (TOPHI)– ACUTE– CHRONIC
• 10% of population has hyperuricemia (>7 mg/dl), but only 1/20 of these has gout
Classification of GoutClinical Category Metabolic Defect
Primary Gout (90% of cases)
Enzyme defects unknown (85%–90% of primary gout)
■ Overproduction of uric acid
Normal excretion (majority)
Increased excretion (minority)
Underexcretion of uric acid with normal production
Known enzyme defects—e.g., partial HGPRT deficiency (rare)
■ Overproduction of uric acid
Secondary Gout (10% of cases)
Associated with increased nucleic acid turnover—e.g., leukemias
■ Overproduction of uric acid with increased urinary excretion
Chronic renal disease ■ Reduced excretion of uric acid with normal production
Inborn errors of metabolism—e.g., complete HGPRT deficiency (Lesch-Nyhan syndrome)
■ Overproduction of uric acid with increased urinary excretion
HGPRT, hypoxanthine guanine phosphoribosyl transferase.
HYPERURICEMIA GOUT• Age of the individual and duration of the
hyperuricemia are factors. Gout rarely appears before 20 to 30 years of hyperuricemia. M>>F
• Genetic predisposition is another factor. In addition to the well-defined X-linked abnormalities of HGPRT, primary gout follows multifactorial inheritance and runs in families.
• Heavy alcohol consumption predisposes to attacks of gouty arthritis.
• Obesity increases the risk of asymptomatic gout. • Certain drugs (e.g., thiazides) predispose to the
development of gout. • Lead toxicity increases the tendency to develop
gout
FEATURES• TOPHACEOUS ARTHRITIS
• GOUTY NEPHROPATHY
GOUTY NEPHROPATHY
GOUT• Associated with ATHEROSCLEROSIS
• Associated with HYPERTENSION
Pseudo-GOUT• Gout: Monosodium Urate• Pseudo-GOUT: Calcium Pyrophosphate
• PSEUDOGOUT is also called CHONDROCALCINOSIS, or CPPD (Calcium Phosphate Deposition Disease)
• IDIOPATHIC, HEREDITARY, SECONDARY
–Secondary joint damage, hyperparathyroidism, hemochromatosis, hypomagnesemia, hypothyroidism, ochronosis, and diabetes
GOUT vs. PSEUDOGOUT
JOINT TUMORS• BENIGN
– GANGLION (SYNOVIAL CYST)– GIANT CELL TUMOR of TENDON SHEATH,
aka PVNS, Pigmented VilloNodular Synovitis
• MALIGNANT– SYNOVIAL SARCOMA
GANGLION
PVNS/GCT
Synovial Sarcoma
“SOFT TISSUE” TUMORS
• FAT
• FIBROUS TISSUE
• FIBROHISTIOCYTIC
• SKELETAL MUSCLE
• SMOOTH MUSCLE
• VASCULAR
• PERIPHERAL NERVE• UNCERTAIN: SYNOVIAL SARCOMA, ALVEOLAR
SOFT PART SARCOMA, EPITHELIOD SARCOMA
CAUSES• MOSTLY UNKNOWN• RADIATION association• CHEMICAL BURN association• THERMAL BURN association• TRAUMA association• VIRUS association (HHV8 for Kaposi)• GENETICS• Parts of many SYNDROMES• MANY TRANSLOCATIONS
Chromosomal and Genetic Abnormalities in Soft Tissue Sarcomas
Tumor Cytogenetic Abnormality Genetic Abnormality
Extraosseous Ewing sarcoma and primitive neuroectodermal tumor
t(11:22)(q24;q12) FLI-1-EWS fusion gene
t(21:22)(q22;q12) ERG-EWS fusion gene
t(7;22)(q22;q12) ETV1-EWS fusion gene
Liposarcoma—myxoid and round cell type
t(12:16)(q13;p11) CHOP/TLS fusion gene
Synovial sarcoma t(x;18)(p11;q11) SYT-SSX fusion gene
Rhabdomyosarcoma—alveolar type t(2;13)(q35;q14) PAX3-FKHR fusion gene
t(1;13)(p36;q14) PAX7-FKHR fusion gene
Extraskeletal myxoid chondrosarcoma t(9;22)(q22;q12) CHN-EWS fusion gene
Desmoplastic small round cell tumor t(11;22)(p13;q12) EWS-WT1 fusion gene
Clear cell sarcoma t(12;22)(q13;q12) EWS-ATF1 fusion gene
Dermatofibrosarcoma protuberans t(17:22)(q22;q15) COLA1-PDGFB fusion gene
Alveolar soft part sarcoma t(X;17)(p11.2;q25) TFE3-ASPL fusion gene
Congenital fibrosarcoma t(12;15)(p13;q23) ETV6-NTRK3 fusion gene
SOFT TISSUE TUMORS
• ALL “SPINDLY”
• Deep (desmoid) vs. Superficial (skin)
• Importance of counting MITOSES• Importance of STAGING
• Importance of IMMUNOPEROXIDASE
• Importance of CONSULTATION
FAT• LIPOMA
• LIPOSARCOMA
NORMAL FAT LIPOMA, encapsulated
LIPOSARCOMA, often retroperitoneal
FIBROUS TISSUE• NODULAR FASCIITIS
(pseudosarcomatous)• FIBROMATOSES
(plantar, palmar, penile)• FIBROSARCOMA
MYOSITIS OSSIFICANS• BENIGN FIBROUS TISSUE
PROLIFERATION PLUS OSSEOUS “METAPLASIA”
FIBROHISTIOCYTIC• FIBROUS HISTIOCYTOMA• DERMATOFIBROSARCOMA
PROTUBERANS• MALIGNANT FIBROUS HISTIOCYTOMA
SKELETAL MUSCLE• RHABDOMYOMA
• RHABDOMYOSARCOMA
SMOOTH MUSCLE• LEIOMYOMA
• LEIOMYOSARCOMA
VASCULAR • HEMANGIOMA
• LYMPHANGIOMA
• HEMANGIOENDOTHELIOMA
• HEMANGIOPERICYTOMA
• ANGIOSARCOMA
PERIPHERAL NERVE• NEUROFIBROMA
• SCHWANNOMA
• GRANULAR CELL TUMOR
• MALIGNANT (SCHWANNOMA)
UNCERTAIN• SYNOVIAL SARCOMA
• ALVEOLAR “SOFT PART” SARCOMA
• EPITHELIOD SARCOMA