Reverse Pattern Analysis
WHAT IS REVERSE PATTERN ANALYSIS (RPA):¹⁻⁵⁻⁶
- Step-wise algorithm to diagnose lesions based on geometric terms.
BASIC STRUCTURES: (Five Geometric Terms)
- “Pattern” formed by repetition of a basic structure covering a significant portion of a lesion (≥ 20%).
- “Structureless” means no specific pattern stands out.
| Term | Definition | Image |
|---|---|---|
| Lines (Basic) |
A form much longer than it is wide. |
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| Lines (Reticular) |
Lines forming mesh-like (lattice) pattern |
 |
|
Lines (Branched) |
Lines extend from the mainline (like branches/veins) |  |
| Lines (Parallel) |
Lines equidistant and do not intersect |
 |
|
Lines (Radial) |
Lines extend outwards from a central point (starburst) |  |
|
Lines (Curvey) |
Lines without sharp angles (arc, waves) |  |
| Pseudopods |
Line with a rounded or swollen end |
 |
|
Circles |
Continuous curved line that stays fairly even in distance from a central point (inc. ellipses) |  |
| Clods | Defined object bigger than dot (any shape/colour) |  |
| Dots |
Small no-shape structure (x10 magnification) |
 |
Blood Vessel Patterns
Monomorphous: Pattern (≥ 20%) of a single structure (n=1).
Polymorphous: Multiple patterns
