Inflammatory cell infiltrate variable in concentration along mesothelium (+ to +++) Inflammatory cells migrated onto mesothelium surface
Group 3
A
Inflammatory cell infiltrate (+++) with cells on mesothelial surface Loss of mesothelium in some sections of intense inflammatory cell infiltration Remaining areas uninvolved
Patches of inflammatory cell infiltrate (+ to +++)
D
Patches of inflammatory cell infiltrate (+)
E
NAD
Group 1: control animals, no treatment with CO2. Group 2: insufflation with room temperature, dry CO2. Group 3: insufflation with warm, dry CO2. Group 4: insufflation with warm, humidified CO2. Letters (A–E) refer to individual rats. NAD: no abnormality detected.