What type of lumbosacral agenesis demonstrates partial sacral agenesis with bilateral symmetric defects, but intact sacroiliac joints with the first sacral segment?

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Type II lumbosacral agenesis is characterized by partial sacral agenesis with bilateral symmetric defects, but intact sacroiliac joints with the first sacral segment. Type I is characterized by complete sacral and coccygeal agenesis, while Type III has incomplete sacral agenesis with unilateral defects and Type IV is also known as Caudal Regression Syndrome with varying degrees of agenesis in the lumbar, sacral and coccygeal regions.

What Type of Lumbosacral Agenesis Demonstrates Partial Sacral Agenesis with Bilateral