28 results
Autoimmune Myositis
Necrotizing myopathy is associated with higher CK levels, greater level of muscle weakness, less systemic
Autoimmune Myositis ... Dermatomyositis ... /full triad at diagnosis ... @AnnKumfer #Autoimmune ... #Myositis #diagnosis
Myositis and Myopathies
Polymyositis 
 • Progressive, symmetric muscle weakness 
 • Elevated CK, +Anti-Jo, +Anti-Mi2
Dermatomyositis
Myositis and Myopathies ... Anti-Jo, +Anti-Mi2 Dermatomyositis ... muscle weakness, rash ... Inclusion Body Myositis ... #differential #diagnosis
Creatine Kinase - Causes of Elevated CK Levels
Acute CK Elevation (Pain > Weakness):
 • RHABDOMYOLYSIS
Creatine Kinase - Causes ... Inflammatory myopathy: dermatomyositis ... myopathy - Autoimmune ... Inclusion body myositis ... #differential #diagnosis
Inflammatory Myopathies
Dermatomyositis
 • Onset: Subacute
 • Pattern: Proximal
 • CK: Up to 50X ULN
 • Autoantibodies:
Inflammatory Myopathies Dermatomyositis ... exclusion Necrotizing Autoimmune ... Myositis • Onset ... Inclusion Body Myositis ... #differential #diagnosis
Causes of Rhabdomyolysis - Differential Diagnosis
 • Drugs & Toxins (Statins, alcohol, cocaine)
 • Direct Muscle
Causes of Rhabdomyolysis ... - Differential Diagnosis ... Damage (Trauma/crush ... Muscle Disease (myositis ... #Causes
Causes of Neuromuscular Weakness
 • Spinal Cord: Demyelinating Disease (MS), Epidural abscess, Infarction, Syringomyelia, Tetanus, Transverse
Causes of Neuromuscular ... Tetanus, Transverse Myelitis ... , Polymyositis/dermatomyositis ... Neuromuscular #Weakness #Causes ... #differential #diagnosis
Weakness - Differential Diagnosis Framework

Approach To Weakness:
 • Non-neuromuscular disorder (Cardiac, pulmonary etc)
 • CNS ->
- Differential Diagnosis ... necrotizing myopathy • Autoimmune ... Inclusion body myositis ... Muscle Biopsy: Dermatomyositis ... #Differential #Diagnosis
Neuromyelitis Optica (NMO) - Clinical Manifestations
 • Optic neuritis: Reduced visual acuity, ranging from mild to
involvement: Intractable nausea ... • Transverse myelitis ... positive NMO only): Myositis ... , Comorbid autoimmune ... Manifestations #diagnosis
ANTI-MDA5 DERMATOMYOSITIS

Cutaneous manifestations:
• Periorbital heliotrope (blue-purple) rash with edema
• Erythematous rash on the face, or the
ANTI-MDA5 DERMATOMYOSITIS ... (blue-purple) rash ... • Erythematous rash ... Men • ~50% of cases ... #dermatology #diagnosis
Erythemas Summarized
Erythema ab igne
 • A dermatosis that results from repeated exposure to heat (fires, heating
malignancies, autoimmune ... infection and autoimmune ... Mycoplasma classic), autoimmune ... sarcoidosis (and other autoimmune ... #differential #diagnosis