This is an alphabetical mnemonic.

TSRP

T-Thorax: 1. PneumoTHORAX 2. HemoTHORAX

S-Splenic rupture

R-Rib fracture

P-Pneumonia/Pleuritis

[Mnemonic generated by dokidok]

The Mnemonic is made based on First Aid for USMLE step 2 CS