Baylisascariasis biopsy

(A) Cross-sections of larvae of Baylisascaris columnaris (a skunk parasite) in the brain of a laboratory-infected mouse. The larval morphology and microscopic manifestations would be similar with Baylisascaris 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 (thick arrows), excretory columns (arrows), and multinucleate intestinal cells (dashed arrow).