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Applied anatomy, histology, and embryology

Lumbosacral plexus and lower-limb nerve injuries

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SAMPLE QUESTION

A 68-year-old man taking anticoagulants develops a large iliacus-region hematoma. He has weak knee extension, a reduced patellar reflex, and decreased sensation over the anterior thigh and medial lower leg. Hip adduction, ankle dorsiflexion, and plantarflexion are preserved.

Which nerve is most likely compressed?