Castellvi classification of lumbosacral transitional vertebrae

The Castellvi classification is used for lumbosacral transitional vertebra (LSTV):

  • type I: enlarged and dysplastic transverse (at least 19 mm)
    • Ia: unilateral
    • Ib: bilateral
  • type II: pseudoarticulation of the transverse process and sacrum with incomplete lumbarisation/sacralisation; enlargement of the transverse process with pseudoarthrosis
    • IIa: unilateral
    • IIb: bilateral
  • type III: transverse process fuses with the sacrum and there is complete lumbarisation or sacralisation, enlarged transverse process with complete fusion
    • IIIa: unilateral
    • IIIb: bilateral
  • type IV: type IIa on one side and type III on the contralateral side

Related pathology

Spinal anatomy
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Article Information

rID: 24141
Synonyms or Alternate Spellings:
  • Castellvi classification
  • Castellvi's classification
  • Lumbosacral transitional vertebra (Castellvi classification)

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Cases and Figures

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    Displastic left t...
    Figure 1: Castellvi type Ia
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    Case 1: Castellvi type Ia
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    Enlarged left tra...
    Figure 3: Castellvi type IIa
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    Case 2: Castellvi IIa
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    Displastic bilate...
    Figure 2: Castellvi type Ib
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    Case 3: Castellvi IIb
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    Enlarged bilatera...
    Figure 4: Castellvi type IIb
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    Complete osseous ...
    Figure 5: Castellvi type IIIa
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    Complete osseous ...
    Figure 6: Castellvi type IIIb
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    Pseudoarthrosis o...
    Figure 7: Castellvi type IV
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