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
Gottron papules
- Colour
- Erythematous-violaceous
- Elevation
- Papules or plaques
- Site
- Dorsal finger joints
- Direction
- Assess for dermatomyositis
Morphological description
Record violaceous colour, scale, symmetry and distribution; distinguish Gottron papules from flat Gottron erythema.
Causes and diagnostic direction
This sign strongly suggests dermatomyositis; skin manifestations may predominate.
Differential diagnoses
Psoriasis, dermatitis and other knuckle eruptions may mimic the sign; distribution helps distinguish them.
Pitfalls and limitations
Absence of weakness or substantial enzyme elevation does not exclude skin-predominant dermatomyositis.
Take-home message
The joint-centred distribution is essential; integrate skin, muscle and systemic context.
Sources
Documentary review: 2026-10-12
Media source & rights
- Author
- Mohammad2018
- Original source
- Mohammad2018 — Gottron papules .dermatomyocitis.jpg — CC BY-SA 4.0 — https://commons.wikimedia.org/wiki/File%3AGottron_papules_.dermatomyocitis.jpg
- Licence
- CC BY-SA 4.0
- Changes
- Orientation EXIF normalisée ; conversion WebP et redimensionnement proportionnel plafonné à 1600/400px ; aucun recadrage, aucune retouche médicale ; EXIF supprimé. Dérivé écran proportionnel ≤1280 px, WebP qualité76 ; vignette ≤320 px qualité72. Source acquise et dérivé initial conservés sans modification ; aucune retouche médicale, aucun recadrage.
- Dimensions
- 800 × 903 px
- Check
- 2026-10-11