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Pathology - Osteochondroma
arises from the growth plate's lateral portion being displaced, which causes the bone to proliferate away from the long axis.
The most frequent benign tumor of the bone is osteochondroma.
Most frequently observed in guys under 25.
Gross: Usually appears in the tibia or femur metaphysis; a cartilage cap protrudes from the bone to cover the growing stalk of the bone.
Microscopic: Hyaline cartilage covers the freshly produced bone that results from endochondral ossification, which covers the medullary cavity that forms the stalk's core.
frequently asymptomatic and found by accident on radiographs; if symptomatic, it may show up as a mass or pain from a stalk fracture, nerve impingement, or irritation of the soft tissue around the mass; in rare cases, it may progress to chondrosarcoma.
Imaging: Radiographs show the growth of the bone stalk.
Surgery in case of symptoms.
several hereditary exostosis is an autosomal dominant disorder in which there are several osteochondromas.
Benign tumors originating from osteoblasts include osteoid osteoma and osteoblastoma. Osteoblastomas typically originate in the spine, whereas osteoid osteomas typically start in the femur or tibia.
The most prevalent symptom of these lesions in men under 25 is bone discomfort.
arises from the growth plate's lateral portion being displaced, which causes the bone to proliferate away from the long axis.
The most frequent benign tumor of the bone is osteochondroma.
Most frequently observed in guys under 25.
Gross: Usually appears in the tibia or femur metaphysis; a cartilage cap protrudes from the bone to cover the growing stalk of the bone.
Microscopic: Hyaline cartilage covers the freshly produced bone that results from endochondral ossification, which covers the medullary cavity that forms the stalk's core.
frequently asymptomatic and found by accident on radiographs; if symptomatic, it may show up as a mass or pain from a stalk fracture, nerve impingement, or irritation of the soft tissue around the mass; in rare cases, it may progress to chondrosarcoma.
Imaging: Radiographs show the growth of the bone stalk.
Surgery in case of symptoms.
several hereditary exostosis is an autosomal dominant disorder in which there are several osteochondromas.
Benign tumors originating from osteoblasts include osteoid osteoma and osteoblastoma. Osteoblastomas typically originate in the spine, whereas osteoid osteomas typically start in the femur or tibia.
The most prevalent symptom of these lesions in men under 25 is bone discomfort.
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Pathology - Giant Cell Tumor
harmless tumor originating from monocytes.
Typically impacts women in the age range of 20 to 40.
Gross: Typically develops from lengthy bone epiphyses, particularly at the knee (proximal tibia, distal femur); big, reddish-brown in color; frequently exhibits bleeding, necrosis, and cystic degeneration.
Microscopic: Spindle-shaped large cells of the osteoclast type, with up to 100 nuclei; fibrous stroma; uniform oval mononuclear cells exhibiting multiple mitoses.
Clinical Signs and Symptoms
fractures; joint pain and other signs of arthritis.
Rarely, metastases to the lung or lymph nodes are among the complications.
Visualization: appearance of a soap bubble or two bubbles on a radiograph.
Treatment includes radiation and chemotherapy if there are lung metastases in addition to surgical excision.
Though it recurs 40%–60% of the time after therapy, it is still aggressive and very rarely develops malignant.
Most often found in the hands and feet, enchondroma is a benign cartilaginous tumor that originates from the intramedullary bone. Enchondromas can be painful and result in a fracture, but they are typically asymptomatic and discovered by accident on radiographs (notice the distinctive O-ring sign on x-rays).
harmless tumor originating from monocytes.
Typically impacts women in the age range of 20 to 40.
Gross: Typically develops from lengthy bone epiphyses, particularly at the knee (proximal tibia, distal femur); big, reddish-brown in color; frequently exhibits bleeding, necrosis, and cystic degeneration.
Microscopic: Spindle-shaped large cells of the osteoclast type, with up to 100 nuclei; fibrous stroma; uniform oval mononuclear cells exhibiting multiple mitoses.
Clinical Signs and Symptoms
fractures; joint pain and other signs of arthritis.
Rarely, metastases to the lung or lymph nodes are among the complications.
Visualization: appearance of a soap bubble or two bubbles on a radiograph.
Treatment includes radiation and chemotherapy if there are lung metastases in addition to surgical excision.
Though it recurs 40%–60% of the time after therapy, it is still aggressive and very rarely develops malignant.
Most often found in the hands and feet, enchondroma is a benign cartilaginous tumor that originates from the intramedullary bone. Enchondromas can be painful and result in a fracture, but they are typically asymptomatic and discovered by accident on radiographs (notice the distinctive O-ring sign on x-rays).
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Pathology - Osteosarcoma
tumor produced by cancerous osteoblasts, which are cells that make bone.
Bone infarcts, fibrous dysplasia, ionizing radiation, hereditary retinoblastoma, Paget disease of the bone, and p53 mutations are risk factors.
occurs most commonly in men between the ages of 10 and 20, however the elderly have a lower peak of frequency.
Pathology
Gross: Develops in long bone metaphysis, particularly at the knee (proximal tibia, distal femur); huge, bulky mass with areas of cystic degeneration and bleeding; frequently destroys surrounding cortex and extends into medullary canal.
Microscopic: development of neoplastic osteoid formation, anaplastic cells, and multinucleated large cells.
Clinical Signs and Symptoms
Pain and edema surrounding the fracture site; frequently spreads to the liver, brain, or lung and may show signs of metastasis.
Results from the lab: elevated ALP levels in the serum.
Imaging: sunburst growth pattern on radiograph; Codman triangle (raising of periosteum).
Interventions
chemotherapy; amputation of a limb; surgical resection.
The 5-year survival rate for the prognosis is about 60%.
The most frequent primary malignant tumor of bone is osteosarcoma.
A malignant cartilaginous tumor, chondrosarcoma primarily affects men between the ages of 30 and 60.
It usually affects the tibia, femur, ribs, pelvis, and spine.
tumor produced by cancerous osteoblasts, which are cells that make bone.
Bone infarcts, fibrous dysplasia, ionizing radiation, hereditary retinoblastoma, Paget disease of the bone, and p53 mutations are risk factors.
occurs most commonly in men between the ages of 10 and 20, however the elderly have a lower peak of frequency.
Pathology
Gross: Develops in long bone metaphysis, particularly at the knee (proximal tibia, distal femur); huge, bulky mass with areas of cystic degeneration and bleeding; frequently destroys surrounding cortex and extends into medullary canal.
Microscopic: development of neoplastic osteoid formation, anaplastic cells, and multinucleated large cells.
Clinical Signs and Symptoms
Pain and edema surrounding the fracture site; frequently spreads to the liver, brain, or lung and may show signs of metastasis.
Results from the lab: elevated ALP levels in the serum.
Imaging: sunburst growth pattern on radiograph; Codman triangle (raising of periosteum).
Interventions
chemotherapy; amputation of a limb; surgical resection.
The 5-year survival rate for the prognosis is about 60%.
The most frequent primary malignant tumor of bone is osteosarcoma.
A malignant cartilaginous tumor, chondrosarcoma primarily affects men between the ages of 30 and 60.
It usually affects the tibia, femur, ribs, pelvis, and spine.
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Pathology - Ewing Sarcoma
connected to the translocation t of the chromosome (11, 22), resulting in the formation of the fusion protein EWS-FL/1, a super-activated transcriptional factor.
classified as a little, spherical, blue tumor; the source of the tumor cells is uncertain.
Most common in males under the age of twenty.
Pathology
Gross: Usually develops in the scapula, pelvis, ribs, and medullary cavities of long bones.
Microscopic: Necrosis may be seen; tumor cells may be organized in a pseudorosette pattern. Sheets of tiny, spherical, blue, homogenous cells with minimal cytoplasm.
Clinical Symptoms and Signs
painful, enlarged, expanding mass; may exhibit systemic symptoms such as fever and anemia (may resemble symptoms of osteomyelitis); may occur with pathological fracture.
As a result, there may be lung, lymph node, or infrequently, central nervous system metastases.
Imaging: On a radiograph, a lymphatic tumor resembles an onion.
Interventions
radiation, chemotherapy, and surgical resection.
An very aggressive tumor with a 70% 5-year survival rate for localized disease and less than 30% for metastatic disease is prone to metastasis early.
connected to the translocation t of the chromosome (11, 22), resulting in the formation of the fusion protein EWS-FL/1, a super-activated transcriptional factor.
classified as a little, spherical, blue tumor; the source of the tumor cells is uncertain.
Most common in males under the age of twenty.
Pathology
Gross: Usually develops in the scapula, pelvis, ribs, and medullary cavities of long bones.
Microscopic: Necrosis may be seen; tumor cells may be organized in a pseudorosette pattern. Sheets of tiny, spherical, blue, homogenous cells with minimal cytoplasm.
Clinical Symptoms and Signs
painful, enlarged, expanding mass; may exhibit systemic symptoms such as fever and anemia (may resemble symptoms of osteomyelitis); may occur with pathological fracture.
As a result, there may be lung, lymph node, or infrequently, central nervous system metastases.
Imaging: On a radiograph, a lymphatic tumor resembles an onion.
Interventions
radiation, chemotherapy, and surgical resection.
An very aggressive tumor with a 70% 5-year survival rate for localized disease and less than 30% for metastatic disease is prone to metastasis early.
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Pathology - Rheumatoid Arthritis
The etiology is uncertain, although it is thought that in individuals who are genetically vulnerable (HLA-DR4), an acute inflammatory response sets off a chronic autoimmune reaction.
most prevalent in females aged 30 to 50.
Joint: Initially, there is edema and lymphocytic infiltration in the synovium, which results in the formation of villi made of synovial lining cells and neutrophils in the synovial fluid. Later, the cartilage is destroyed and replaced with fibrocellular granulation tissue, or pannus, and joint deformity is caused by scarring following inflammation.
Rheumatoid nodule: firm, nontender, subcutaneous nodule; palisade of macrophages, lymphocytes, and fibroblasts encircling core of fibrinoid necrosis.
Clinical Signs and Symptoms
A rheumatoid nodule usually over bony prominences; a swan-neck deformity (flexion of DIP with extension of PIP joint); a boutonniere deformity (extension of DIP with flexion of PIP joint); ulnar deviation of fingers; joint deformities; fatigue; fever; symmetric joint swelling with stiffness and pain that often involves PIP and MCP joints of the fingers, wrists, knees, and ankles that is most severe in the morning and improves with activity.
Pericarditis, pleuritis, vasculitis, pulmonary fibrosis, and secondary amyloidosis are among the complications.
Imaging: narrowing of the joint space; osteopenja; bone degradation at the joints.
Results from the lab included elevated ESR, anemia, positive anti-CCP antibody, and positive rheumatoid factor (IgM antibody against IgG Fe fragment).
Treatments include NSAIDs, glucocorticoids, and immunomodulators (e.g., etanercept for severe disease; methotrexate or leflunomide for mild disease).
The etiology is uncertain, although it is thought that in individuals who are genetically vulnerable (HLA-DR4), an acute inflammatory response sets off a chronic autoimmune reaction.
most prevalent in females aged 30 to 50.
Joint: Initially, there is edema and lymphocytic infiltration in the synovium, which results in the formation of villi made of synovial lining cells and neutrophils in the synovial fluid. Later, the cartilage is destroyed and replaced with fibrocellular granulation tissue, or pannus, and joint deformity is caused by scarring following inflammation.
Rheumatoid nodule: firm, nontender, subcutaneous nodule; palisade of macrophages, lymphocytes, and fibroblasts encircling core of fibrinoid necrosis.
Clinical Signs and Symptoms
A rheumatoid nodule usually over bony prominences; a swan-neck deformity (flexion of DIP with extension of PIP joint); a boutonniere deformity (extension of DIP with flexion of PIP joint); ulnar deviation of fingers; joint deformities; fatigue; fever; symmetric joint swelling with stiffness and pain that often involves PIP and MCP joints of the fingers, wrists, knees, and ankles that is most severe in the morning and improves with activity.
Pericarditis, pleuritis, vasculitis, pulmonary fibrosis, and secondary amyloidosis are among the complications.
Imaging: narrowing of the joint space; osteopenja; bone degradation at the joints.
Results from the lab included elevated ESR, anemia, positive anti-CCP antibody, and positive rheumatoid factor (IgM antibody against IgG Fe fragment).
Treatments include NSAIDs, glucocorticoids, and immunomodulators (e.g., etanercept for severe disease; methotrexate or leflunomide for mild disease).
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Pathology- Adult Onset Still Disease
The cause is unknown, although it is thought that genetic factors (people with HLA-B 17 or HLA-DR2) or infectious etiologies (viral; Mycoplasma) could be at play.
most prevalent in people with ages ranging from 15 to 45.
Skin: Dermal edema with lymphocytic and histiocytic infiltration; blood vessel walls may exhibit C3 deposition.
Synovial tissue: Infiltration of mononuclear cells causes long-term inflammatory alterations.
One to two daily ("quotidian or biquotidian") fever spikes accompanied by the development of a salmon-colored maculopapular rash on the trunk and limbs; the rash can also be triggered by skin irritation (Koebner phenomenon); polyarthralgias and arthritis, which typically affect the PIP joints, knees, wrists, and ankles; sore throat; lymphadenopathy; pericarditis.
Imaging: Narrowing of the nonerosive joint space, typically observed in the wrists.
Results from the lab: raised liver transaminases, elevated ferritin levels, negative ANA and RF, elevated ESR, 60% of patients may exhibit reactive thrombocytosis and/or anemia, and leukocytosis.
Treatments: glucocorticoids, NSAIDs, and TNF inhibitors (such as rituximab) for cases that don't respond.
Adult Onset Still Disease.
The adult form of juvenile idiopathic arthritis with systemic onset is known as still disease.
A kind of rheumatoid arthritis that affects youngsters is called juvenile idiopathic arthritis (JIA).
It includes multiple subtypes: pauciarticular onset JIA (defined by age of onset < 5 years, large joint mild arthralgias, uveitis, and a positive ANA), polyarticular onset JIA (defined by destructive arthritis in knees and wrists or dactylitis), and systemic onset JIA (defined by fever, rash, anemia, and hepatosplenomegaly).
The cause is unknown, although it is thought that genetic factors (people with HLA-B 17 or HLA-DR2) or infectious etiologies (viral; Mycoplasma) could be at play.
most prevalent in people with ages ranging from 15 to 45.
Skin: Dermal edema with lymphocytic and histiocytic infiltration; blood vessel walls may exhibit C3 deposition.
Synovial tissue: Infiltration of mononuclear cells causes long-term inflammatory alterations.
One to two daily ("quotidian or biquotidian") fever spikes accompanied by the development of a salmon-colored maculopapular rash on the trunk and limbs; the rash can also be triggered by skin irritation (Koebner phenomenon); polyarthralgias and arthritis, which typically affect the PIP joints, knees, wrists, and ankles; sore throat; lymphadenopathy; pericarditis.
Imaging: Narrowing of the nonerosive joint space, typically observed in the wrists.
Results from the lab: raised liver transaminases, elevated ferritin levels, negative ANA and RF, elevated ESR, 60% of patients may exhibit reactive thrombocytosis and/or anemia, and leukocytosis.
Treatments: glucocorticoids, NSAIDs, and TNF inhibitors (such as rituximab) for cases that don't respond.
Adult Onset Still Disease.
The adult form of juvenile idiopathic arthritis with systemic onset is known as still disease.
A kind of rheumatoid arthritis that affects youngsters is called juvenile idiopathic arthritis (JIA).
It includes multiple subtypes: pauciarticular onset JIA (defined by age of onset < 5 years, large joint mild arthralgias, uveitis, and a positive ANA), polyarticular onset JIA (defined by destructive arthritis in knees and wrists or dactylitis), and systemic onset JIA (defined by fever, rash, anemia, and hepatosplenomegaly).
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Pathology - Osteoarthritis
wear-and-tear arthritis, which is the degeneration of articular cartilage as a result of cumulative mechanical stress to the joints.
affects women more frequently than men; typically manifests after age 50 and is linked to obesity.
Pathology
Joint: Osteophyte formation (growth of new bone at articular edges); joint mice (fractured osteophytes floating in synovial fluid); eburnation of bone (polishing of bone due to rubbing of bone with bone); joint cartilage flakes off and is eroded, exposing underlying bone.
Clinical Signs and Symptoms
Heberden nodes and Bouchard nodes, which are osteophytes at the DIP and PIP joints, respectively, may be seen. Joint pain and stiffness that gets worse with use most frequently occurs in the hip, knee, lumbosacral spine, MTP joint of the toe, and DIP and PIP joints of the fingers.
Visualization: joint space narrowing accompanied by subchondral sclerosis and osteophytes.
Treatment options include NSAIDs, weight loss if obese, injections of corticosteroids into the afflicted joint, and joint replacement surgery.
The location of joint involvement, laboratory tests (which are normal in osteoarthritis), and description of joint pain (the impact of mobility on pain) can be used to differentiate osteoarthritis from rheumatoid arthritis.
wear-and-tear arthritis, which is the degeneration of articular cartilage as a result of cumulative mechanical stress to the joints.
affects women more frequently than men; typically manifests after age 50 and is linked to obesity.
Pathology
Joint: Osteophyte formation (growth of new bone at articular edges); joint mice (fractured osteophytes floating in synovial fluid); eburnation of bone (polishing of bone due to rubbing of bone with bone); joint cartilage flakes off and is eroded, exposing underlying bone.
Clinical Signs and Symptoms
Heberden nodes and Bouchard nodes, which are osteophytes at the DIP and PIP joints, respectively, may be seen. Joint pain and stiffness that gets worse with use most frequently occurs in the hip, knee, lumbosacral spine, MTP joint of the toe, and DIP and PIP joints of the fingers.
Visualization: joint space narrowing accompanied by subchondral sclerosis and osteophytes.
Treatment options include NSAIDs, weight loss if obese, injections of corticosteroids into the afflicted joint, and joint replacement surgery.
The location of joint involvement, laboratory tests (which are normal in osteoarthritis), and description of joint pain (the impact of mobility on pain) can be used to differentiate osteoarthritis from rheumatoid arthritis.
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Ankylosing Spondylitis
Epidemiology of Ankylosing Spondylitis: Prevalent in young males who test positive for HLA-B27.
Clinical signs and symptoms include peripheral arthritis of the spine and major joints, uveitis, lower back pain and stiffness (particularly in the morning), elevated ESR, and a bamboo spine on radiographs.
Clinical signs and symptoms include peripheral arthritis of the spine and major joints, uveitis, lower back pain and stiffness (particularly in the morning), elevated ESR, and a bamboo spine on radiographs.
Psoriatic Arthritis
Etiology and Epidemiology of Psoriatic Arthritis: Usually appears between the ages of 30 and 50; 15% to 20% of psoriasis patients have this condition. Clinical signs include arthritis of the hands, foot, and major joints; sausage fingers (synovitis of the tendon sheath of the fingers); pitting of fingernails; inflammation of the eyes; and a radiograph-detected "pencil-in-cup" deformity of the DIP joints.
Reactive Arthritis
The etiology and epidemiology of reactive arthritis: reaction to a previous gastrointestinal or urinary tract infection (e.g., Shigella, Salmonella, or Chlamydia); particularly prevalent in young males who test positive for HLA-B27. Clinical signs and symptoms: The classic trifecta of conjunctivitis or uveitis, arthritis, and nongonococcal urethritis manifests as lower back discomfort and asymmetric joint stiffness, generally in the ankles or knees.
Enteropathies Arthritis
Enteropathies Arthritis: Most common in people who are HLA-B27 positive; associated with inflammatory bowel disease or gastrointestinal infections. Clinical signs and symptoms: Erythema nodosum and asymmetric oligoarthritis of the major joints (knees, spine) usually go away within a few months when inflammatory bowel disease is treated.
Treatments
NSAIDs, physical therapy, and intra-articular steroid injections are the three main forms of treatment for spondyloarthropathies.
Treatments
NSAIDs, physical therapy, and intra-articular steroid injections are the three main forms of treatment for spondyloarthropathies.
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Pathology - Gout
Caused by urate crystals that are deposited together as a result of hyperuricemia.
Primary: Occurs most frequently in middle-aged males and Pacific Islanders; caused by idiopathic hyperuricemia; risk factors include obesity, alcohol consumption, and hereditary vulnerability.
Secondary: Results from hyperuricemia brought on by underlying conditions such Lesch-Nyhan syndrome (HGPRT deficiency), myeloproliferative diseases, reduced urate excretion (renal illness), and medications.
Joint: Emejected synovium with inflammatory infiltrate; urate crystals (needle-shaped, negatively birefringent crystals) and neutrophils in synovial fluid; urate deposits can eventually cause cartilage degradation.
Tophi: Urate crystal cluster encircled by large cells, lymphocytes, and fibroblasts found in cartilage or soft tissues.
Acute arthritis may give way to chronic arthritis; tophi on the hands, feet, or ears may appear months after acute arthritis; urate nephropathy with interstitial deposit of urate crystals and obstruction by uric acid stones; swollen, tender joint with abrupt onset, frequently in MTP joint of big toe (podagra), foot, ankles, or knees.
Results from the lab: leukocytosis, elevated ESR, and hyperuricemia.
Treatments: probenecid or allopurinol for long-term care; colchicine, NSAIDs, and/or steroids for acute flare-ups.
Calcium pyrophosphate crystals (positive, birefringent, rhomboid crystals) deposited in joints are the source of pseudogout. Large joints, such as the knee, shoulders, and wrists, are typically affected, and it is more common among the elderly. NSAIDs or intra-articular steroids are used to treat it.
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Pathology - Duchenne Muscular Dystrophy
X-linked recessive condition Duchenne muscular dystrophy, which is characterized by a lack of dystrophin synthesis, mainly due to gene deletion.
impacts men and starts at age five.
Pathophysiology: Dystrophin is crucial in preserving the integrity of the myocyte membrane; its absence results in the degeneration of muscle fibers.
Muscle: Changes in muscle fiber size; deterioration and necrosis of muscle fibers; fat and connective tissue supplanting necrotic fibers.
Clinical Signs and Symptoms
weakness in the proximal muscles of the extremities (typically the pelvis), which develops superiorly and finally results in immobilization; pseudohypertrophy in the calves, which is caused by the replacement of muscle with fibrous and fatty tissue; and the ability to perform the Gowers maneuver, which involves using the arms to raise oneself from a crouch.
Scoliosis, heart arrhythmias, and dilated cardiomyopathies are among the complications.
Results from the lab: elevated serum CK.
Handling
There is evidence linking glucocorticoids to improved muscular function and strength.
The prognosis is poor; respiratory failure from involvement of respiratory muscles usually results in mortality by the age of 25.
A mutation in the dystrophin gene that results in decreased dystrophin production is the hallmark of Becker muscular dystrophy. It manifests similarly to Duchenne muscular dystrophy, although the prognosis is modestly better (mean age of death is 40) and the disease is clinically less severe.
X-linked recessive condition Duchenne muscular dystrophy, which is characterized by a lack of dystrophin synthesis, mainly due to gene deletion.
impacts men and starts at age five.
Pathophysiology: Dystrophin is crucial in preserving the integrity of the myocyte membrane; its absence results in the degeneration of muscle fibers.
Muscle: Changes in muscle fiber size; deterioration and necrosis of muscle fibers; fat and connective tissue supplanting necrotic fibers.
Clinical Signs and Symptoms
weakness in the proximal muscles of the extremities (typically the pelvis), which develops superiorly and finally results in immobilization; pseudohypertrophy in the calves, which is caused by the replacement of muscle with fibrous and fatty tissue; and the ability to perform the Gowers maneuver, which involves using the arms to raise oneself from a crouch.
Scoliosis, heart arrhythmias, and dilated cardiomyopathies are among the complications.
Results from the lab: elevated serum CK.
Handling
There is evidence linking glucocorticoids to improved muscular function and strength.
The prognosis is poor; respiratory failure from involvement of respiratory muscles usually results in mortality by the age of 25.
A mutation in the dystrophin gene that results in decreased dystrophin production is the hallmark of Becker muscular dystrophy. It manifests similarly to Duchenne muscular dystrophy, although the prognosis is modestly better (mean age of death is 40) and the disease is clinically less severe.
Duchenne Muscular Dystrophy
