Special Senses System

Ear, Canal - Dilation

    Narrative
    Ear, Canal - Dilation in a male Fischer 344/N rat from a chronic study. Dilation of the external ear canal (arrow), characterized by plugs of sloughed keratin lamellae, cerumen, and necrotic debris that occludes and distends the canal.
    Ear, Canal - Dilation in a male B6C3F1 mouse from a chronic study. The dilated external ear canal (arrow), is distended by sloughed keratin lamellae, cerumen, and necrotic debris that occludes the canal.
    Ear, Canal - Dilation in a male B6C3F1 mouse from a chronic study. This higher magnification image of Figure 2 shows the dilated external ear canal (arrow) plugged with sloughed keratin lamellae, cerumen, and necrotic debris in greater detail.

    Author

    Margarita M. Gruebbel, DVM, PhD, DACVP
    Senior Pathologist
    Experimental Pathology Laboratories, Inc.
    Research Triangle Park, NC

    Reviewers

    Ruth E. Hurley, DVM, PHD, DACVP
    Senior Veterinary Pathologist
    Huntingdon Life Sciences
    North Brunswick, NJ

    Robert R. Maronpot, DVM, MS, MPH, DACVP, DABT, FIATP
    Senior Pathologist
    Experimental Pathology Laboratories, Inc.
    Research Triangle Park, NC