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©2013 UpToDate ® Print Email Baylisascariasis biopsy (A) Cross-sections of larvae of B. columnaris (a skunk parasite) in the brain of a laboratory-infected mouse. The larval morphology and microscopic manifestations would be similar with B. procyonis in human tissue. Image taken at 400x magnification. (B) Higher magnification (1000x oil) of a cross-section of B. columnaris from the same specimen as figure A. Notice the prominent alae (green arrows), excretory columns (red arrows), and multinucleate intestinal cells (blue arrow). Reproduced from: Centers for Disease Control and Prevention. Parasites and Health: Baylisascariasis. Available at: file://dpd.cdc.gov/dpdx/html/Baylisascariasis.htm .