Spelling of system 'Tsmi'

In Parts.csv the spelling of System “Small intestine Tissue” is “TSMI”. In the main Loinc.csv it is “Tsmi” in System (though not in longName). This caused a small glitch in my import code. I can work around that (lowercase everything in comparisons), but it looks like the only spelling deviation between Parts and Loinc.

Is this an error in Parts.csv, or intentionally so?