9 results
Rapidly Progressive Glomerulonephritis (RPGN)
RPGN has three primary pathophysiologic causes differentiated by immunofluorescence

Immune Complex Mediated (granular staining):
Negative IF): • PR3-ANCA ... (C-ANCA): GPA > ... MPO-ANCA (P-ANCA ... #Vasculitis #differential ... #rheumatology
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
proteinuria, rapidly progressing ... mucositis - Rash ... (Dx: GPA, EGPA, ... Serologies for Cryoglobulins ... #rheumatology #
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
Skin ulcers - Glomerulonephritis ... triad of Palpable ... DDX: • ANCA (Antineutrophil ... - GPA, EGPA, microscopic ... classification #rheumatology
Vasculitis Involving the Skin - Differential Diagnosis Framework

Primary: 50% Cutaneous Vasculitis: Leukocytoclastic Vasculitis
Secondary: CTD: SLE, RA
Vessel: Petechiae, Palpable ... ANCA Associated: ... - Microscopic ... - GPA Cutaneous ... #rheumatology #
Causes of Petechial Rash - Differential Diagnosis Algorithm

Pinpoint areas (less than 2 mm) of hemorrhage, which
- Differential ... RA, Sjogren's, GPA ... , EGPA, Microscopic ... Measurement of antinuclear ... immunoglobulins & cryoglobulins
Purpura - Differential Diagnosis Framework

Non-blanchable, dark red to purple, hemorrhagic skin lesions that result from leakage
Purpura - Differential ... /HSP • Cryoglobulinemia ... (MIXED) • ANCA ... #Diagnosis #hematology ... #rheumatology #
Dermatologic Manifestations of Granulomatosis with Polyangiitis (GPA)

Skin involvement in granulomatosis with polyangiitis (GPA) is common and
reticularis Differential ... purpura • Mixed cryoglobulinemia ... • Goodpasture syndrome ... #dermatology #rash ... #diagnosis #rheumatology
Vasculitis - Differential Diagnosis Framework

When to Consider Vasculitis:
• Purpura, ischemic skin lesions
• Mononeuritis multiplex
• Hematuria, proteinuria,
Vasculitis - Differential ... , mucositis • Rash ... )): Microscopic ... + MPO) Cryoglobulinemic ... Diagnosis #Rheumatology
Pulmonary Renal Syndromes - OnePager Summary
Autoimmune ANCA vasculitis (AAV): GPA (granulomatous with polyangiitis), EGPA (eosinophilic granulomatosis
Summary Autoimmune ANCA ... vasculitis (AAV ... • Cutaneous: palpable ... Auto-antibodies: ANCA ... Path: rapidly progressive