Original MICA image-reading exercise, unscored. No clinical narrative absent from the source is added.
- Describe visible findings before proposing an interpretation.
- Suggest an interpretation and at least one image limitation.
- Which clinical findings or investigations would complement this observation?
Reveal the explained reading
Glomerulus with an extracapillary crescent
- Technique
- Histology
- Observation
- A crescent surrounds part of the tuft.
- Limitation
- One crescent cannot quantify biopsy-wide involvement.
Morphological description
A crescent surrounds part of the tuft.
Interpretation and diagnostic limits
The finding is a pattern, not a single aetiology.
Differential diagnoses
Consider ANCA, anti-GBM and immune-complex mechanisms.
Pitfalls
One crescent cannot quantify biopsy-wide involvement.
Take-home message
Describe the pattern before identifying its mechanism.
Sources
Documentary review: 2026-10-14
Media source & rights
- Author
- Nephron
- Original source
- Nephron · Glomérulonéphrite à croissants — micrographie · CC BY-SA 3.0
- Licence
- CC BY-SA 3.0
- Changes
- Full image retained; WebP conversion and proportional resize. No clinical alteration. Derivative retains the source licence.
- Dimensions
- 1280 × 853 px
- Check
- 2026-10-14