Match each of the following distinctive renal biopsy patterns (incorporating light microscopy, electron microscopy, and immunofluorescence findings) to the most likely primary glomerular disease diagnosis.
- Subepithelial immune complex deposition with a 'spike and dome' appearance on electron microscopy; granular IgG and C3 on immunofluorescence.Membranous nephropathy
- Subendothelial immune complex deposits demonstrating a 'tram-track' or double-contour appearance due to capillary wall splitting.Membranoproliferative glomerulonephritis (Type I)
- Diffuse effacement of podocyte foot processes on electron microscopy with normal light microscopy and negative immunofluorescence.Minimal change disease
- Mesangial hypercellularity with prominent granular IgA immune complex deposition on immunofluorescence.IgA nephropathy (Berger disease)
Answer
Subepithelial 'spike and dome' deposits match Membranous nephropathy. Subendothelial 'tram-track' splitting matches Membranoproliferative glomerulonephritis Type I. Diffuse podocyte effacement with normal light microscopy matches Minimal change disease. Mesangial IgA deposits match IgA nephropathy.
Each specific renal pathology description uniquely identifies a distinct glomerular disease. The exact location of immune complexes (subepithelial vs. subendothelial vs. mesangial) combined with pathognomonic morphologic changes (spike and dome, tram-track, podocyte effacement) definitively establishes the histopathologic diagnosis.
Step-by-Step Solution
Key Concept
Interpretation of primary glomerular diseases based on the ultrastructural location of immune deposits and characteristic light microscopy findings.