Camelidae and Cervidae Lymphoma – NAVLE Study Guide

Overview and Clinical Importance

Lymphoma (lymphosarcoma) is the most commonly diagnosed neoplasia in camelids (llamas and alpacas) and represents an important, though sporadic, condition in cervids (deer, elk, moose). This malignancy of lymphoid tissue presents unique diagnostic and therapeutic challenges in these species due to limited research, variable clinical presentations, and the scarcity of established treatment protocols. Understanding the species-specific characteristics of lymphoma is essential for NAVLE success and clinical practice with these increasingly popular animals.

Lymphoma accounts for approximately 18% of all neoplastic and proliferative diseases in camelids, making it the single most common tumor type. Notably, alpacas are significantly overrepresented compared to llamas, with studies showing alpacas comprising up to 75% of diagnosed lymphoma cases. The disease tends to occur at a younger age in camelids compared to other domestic species, with particular prevalence in animals under 5 years of age.

Etiology and Pathophysiology

Camelid Lymphoma

The exact etiology of lymphoma in camelids remains unknown, but several factors have been investigated. Unlike bovine lymphoma, which has a known viral etiology (Bovine Leukemia Virus), camelid lymphoma does not appear to be routinely associated with BLV infection, though a single case report has documented BLV-associated lymphoma in an alpaca. The high prevalence in alpacas and in younger animals suggests a possible genetic predisposition, similar to patterns observed in certain dog breeds and in human pediatric populations.