Interstitial Cell Tumor in a Black-and-White Ruffed Lemur (Varecia Variegatus Variegatus)

    June 2001 in “ Journal of Zoo and Wildlife Medicine ”
    Donald L. Neiffer, Edwin Klein
    TLDR The lemur's testicular tumor was removed, improving its coat and behavior, with no signs of cancer spread.
    A 14.5-year-old male black-and-white ruffed lemur exhibited acute testicular enlargement, poor pelage quality, alopecia, and increased aggression. An orchiectomy was performed, revealing an interstitial cell tumor in the left testicle, with no signs of malignancy. Post-surgery, the lemur's coat quality improved significantly, and its behavior became submissive before gradually returning to normal. Follow-up examinations showed no metastasis or neoplasia in the remaining testicle, and hormone levels were normal. At 19 months post-surgery, the lemur's coat was nearly normal, and it maintained its social status without abnormal aggression.
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