Let’s take a look at the H&E stain.
What do you see?
Endocapillary proliferation with obliteration of the capillary loops
Oops! We don’t see any capillary loops here…try again!
Deposits are best visualized under electron microscopy (EM)
Acute interstitial nephritis
We do see some inflammatory cells in the interstitium here, but there’s a more accurate description of what see. Take another shot!
Excellent! We see hemorrhage into the interstitial space with infiltration of polymorphic neutrophils. This finding should bring you one step closer to our final diagnosis here.
The immunofluorescence for IgA, IgM, IgG, and C1q are ready for you and look pretty similar. What do you see in this representative image below?
Granular basement membrane staining of IgG
The basement membrane does not seem to be a bright green color here. Try again!
“Full house” staining
“Full house” staining refers to granular basement membrane/mesangial staining of IgG, IgA, IgM, C3, and C1q – typically seen in SLE nephritis. We only see
Great! This is a negative IF image and should guide us to the final diagnosis.
Mesangial staining of IgA
The mesangial space does not appear bright green here, thus there is no IgA staining here. Pick again!
It’s time to lock in your final diagnosis!
Post-infectious glomerulonephritis (PIGN)
Warfarin-induced skin necrosis
Hepatitis-C associated membranoproliferative glomerulonephritis (MPGN)
Eosinophilic granulomatosis with polyangiitis
Granulomatosis with polyangiitis
Acute interstitial nephritis (AIN)
Systemic lupus erythematosus (SLE) nephritis
Henoch Schönlein Purpura (HSP)
Anti-glomerular basement membrane (GBM) disease
Acute tubular necrosis (ATN)
Click here if you’re confident in your final diagnosis!