In 1984 Castellvi reported an imaging classification system for LSTV. His system is summarized in Figure 4. Type I is simply an enlarged L5 transverse process which is not felt to be clinically significant. Type II includes formation of either a unilateral or bilateral diarthroidal joint between the enlarged transverse process and the sacrum. Type III is a solid fusion either unilaterally or bilaterally and type IV is mixed with a pseudarthrosis on one side2. - See more at: http://radsource.us/bertolottis-syndrome/#sthash.NIgHzVRD.dpuf
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