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Extra-articular and Other Conditions Associated with Joint Pain

Eyes
  • Iritis or uveitis - Spondyloarthropathies, Sarcoidosis,
Rheumatic fever • Amyloidosis ... syndrome - SLE Neurologic ... neuropathy - SLE, Amyloidosis ... Macroglossia - Amyloidosis ... differential #diagnosis #rheumatology
Seronegative Inflammatory Arthritis - Differential Diagnosis
 • Seronegative Rheumatoid Arthritis 
 • Infectious Arthritis: Viral, Bacterial,
Seronegative Inflammatory ... Systemic Rheumatic Disease ... Sclerosis, Sjogren's Disease ... , Inflammatory Myopathy ... Differential #Diagnosis #rheumatology
Causes of Severe Aortic Regurgitation - Differential Diagnosis
Acute:
 • Leaflet: Traumatic Rupture, Acute Infective Endocarditis, Acute
Injury to Root Chronic ... • Inflammatory ... , Crohn Disease ... Valve Dysfunction Chronic ... Aorta: • Infxn + Inflammatory
Skin Conditions Associated with Joint Pain

Rash
	• Human parvovirus B19 infection

Malar rash
	• SLE
	• Human parvovirus B19 infection
	•
infection • Lyme disease ... Dermatomyositis Erythema chronicum ... migrans • Lyme disease ... • Gonococcal arthritis ... Scleroderma • Amyloidosis
Eosinophils (Eos) and hypereosinophilia (HE)
Caused by eosinophilopoietic cytokines
Common causes:
 - Drug reaction
 - Helminth infection
 -
HIV, HTLVI) - Chronic ... inflammatory diseases ... EGPA, rheumatoid arthritis ... , inflammatory bowel ... 3, DOCK8) - Chronic
Classification of Vasculitis 
Vasculitis of large vessels 
 - Arteritis temporalis (giant-cell arteritis) 
 - Takayasu
large vessels - Arteritis ... - Takayasu arteritis ... - Inflammatory ... syndrome induced by chronic ... Vessels #Diagnosis #Rheumatology
Chronic Diarrhea Differential Diagnosis
 • Inflammatory, Infectious: Recurrent C. diff, Giardiasis
 • Inflammatory, Non-infectious: IBD, Ischemia,
Chronic Diarrhea ... Differential Diagnosis • Inflammatory ... Giardiasis • Inflammatory ... overgrowth, Celiac disease ... , Scleroderma, Amyloidosis
Causes of Fatigue - Differential Diagnosis Algorithm
Endocrine
 • Hypo/Hyperthyroidism
 • Diabetes
 • Pituitary Insufficiency
 • Adrenal
Neoplastic / Hematologic ... Autoimmune / Inflammatory ... • Rheumatoid Arthritis ... Obstructive Pulmonary Disease ... Neurologic
Causes of Thrombocytosis - Differential Diagnosis Algorithm
Spurious:
 • Artifact (redo CBC)
Autonomous:
 • Essential thrombocytosis
 • Polycythemia
Polycythemia Vera • Chronic ... : • Acute or Chronic ... Inflammatory: ... disorders • Celiac disease ... Non malignant hematologic
Approach to Joint Pain - Arthritis Differential Diagnosis Framework

Inflammatory Versus Noninflammatory Pain
 • Is it inflammatory
acute/subacute/chronic ... Rheumatologic Disease ... whippleii (Whipple's disease ... burgdorferi (Lyme disease ... Diagnosis #MSK #rheumatology