Minimal change disease vs FSGS
How to tell Minimal change disease and FSGS apart when a board question makes them look alike.
Minimal change is steroid-responsive child with normal LM; FSGS is segmental sclerosis and often resistant.
Side by side
Child with nephrotic syndrome, normal light microscopy, selective albuminuria, and steroid responsiveness.
Nephrotic syndrome with segmental sclerosis, often linked to HIV collapsing nephropathy, heroin use, obesity, or high-risk ancestry.
Podocyte foot process effacement without sclerosis on light microscopy.
Segmental podocyte injury and sclerosis affect some glomeruli.
Pediatric nephrotic syndrome (typically age 2 to 8), normal light microscopy, completely normal immunofluorescence, diffuse foot process effacement on electron microscopy, and rapid response to steroids support minimal change disease; NSAID use and Hodgkin lymphoma are classic associated triggers.
Adult nephrotic syndrome (especially in African American, Hispanic, HIV-positive, IV heroin user, severely obese, or sickle cell patient), focal segmental sclerosis on light microscopy, foot process effacement on electron microscopy, and partial or absent steroid response support FSGS. The collapsing FSGS variant is the rapidly progressive HIV-associated form.
The trap
Both cause heavy proteinuria, hypoalbuminemia, and diffuse foot process effacement on electron microscopy, so the EM finding alone does not split them. The clinical setting decides which to suspect first. A child aged 2 to 8 with nephrotic syndrome is minimal change disease (treat empirically with prednisone without biopsy; biopsy only if steroid-resistant or atypical). African American or Hispanic adult, HIV-positive patient, IV heroin user, severely obese, sickle cell, or reflux nephropathy patient with nephrotic syndrome is FSGS (biopsy mandatory, less steroid-responsive, often progresses to ESRD). The collapsing FSGS variant is rapidly progressive and classically HIV-associated.
Watch it explained
The repair move
For nephrotic syndrome, biopsy decision branches on age. In a child under 10, treat empirically with prednisone first because minimal change is overwhelmingly likely; biopsy only if steroid-resistant after 8 weeks or atypical features (hematuria, hypertension, low complement). In adults, biopsy is mandatory. Once biopsy lands: normal light microscopy plus completely normal immunofluorescence plus diffuse foot process effacement equals minimal change (high steroid response, low progression risk); focal segmental sclerosis on LM plus foot process effacement on EM equals FSGS (lower steroid response, monitor for CKD, start ACE inhibitor for proteinuria, statin for hyperlipidemia, anticoagulation if serum albumin under 2 g/dL).
Try a free question
CoreA young child develops nephrotic syndrome after a recent infection. Light microscopy is normal and symptoms respond rapidly to steroids. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Minimal change disease. Childhood nephrotic syndrome with normal LM and steroid response points to minimal change disease.
Why the other choices are tempting
- B. FSGS shows segmental sclerosis and is often steroid resistant.
- C. Membranous nephropathy is an adult nephrotic disease with spike-and-dome deposits.
- D. Diabetic nephropathy requires chronic diabetes.
- E. IgA nephropathy is nephritic hematuria, not classic nephrotic syndrome.
Flashcards
Tap a card to flip it.
What is the fastest separator for Minimal change disease vs FSGS?
Minimal change is steroid-responsive child with normal LM; FSGS is segmental sclerosis and often resistant.
What clue should make you choose Minimal change disease?
Child with nephrotic syndrome, normal light microscopy, selective albuminuria, and steroid responsiveness.
Quick answers
What is the fastest way to tell Minimal change disease from FSGS?
Minimal change is steroid-responsive child with normal LM; FSGS is segmental sclerosis and often resistant.
What is the key clue for Minimal change disease?
Child with nephrotic syndrome, normal light microscopy, selective albuminuria, and steroid responsiveness.
What is the key clue for FSGS?
Nephrotic syndrome with segmental sclerosis, often linked to HIV collapsing nephropathy, heroin use, obesity, or high-risk ancestry.
What is the common trap with Minimal change disease vs FSGS?
Both cause heavy proteinuria, hypoalbuminemia, and diffuse foot process effacement on electron microscopy, so the EM finding alone does not split them. The clinical setting decides which to suspect first. A child aged 2 to 8 with nephrotic syndrome is minimal change disease (treat empirically with prednisone without biopsy; biopsy only if steroid-resistant or atypical). African American or Hispanic adult, HIV-positive patient, IV heroin user, severely obese, sickle cell, or reflux nephropathy patient with nephrotic syndrome is FSGS (biopsy mandatory, less steroid-responsive, often progresses to ESRD). The collapsing FSGS variant is rapidly progressive and classically HIV-associated.