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Vet Pathol 41:520-523 (2004)
© 2004 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Pulmonary Neoplasia in Two Llamas (Lama glama)

J. A. Ramos-Vara, C. M. Loiacono, F. Williams, III, I. Pardo and J. Lakritz

Abstract

Two llamas with pulmonary tumors were examined. Llama No. 1 had multiple nodules throughout the lung that consisted histologically of solid clusters of polygonal to spindle cells with rare glandular differentiation. Intravascular emboli were common. Similar neoplastic masses were present in the kidney, heart, and liver. Immunohistochemically, neoplastic cells were positive for broad-spectrum cytokeratins (CKs), high–molecular weight CKs, CKs 5/6, and vimentin. The diagnosis was pulmonary carcinoma. Llama No. 2 had pulmonary nodules without extrapulmonary involvement. Microscopically, neoplastic cells formed acini lined by simple epithelium and solid cords of squamous cells that sometimes surrounded acini. Neoplastic cells were strongly positive for broad-spectrum CKs and weakly positive for thyroid transcription factor–1. The diagnosis was adenosquamous carcinoma. Pulmonary tumors account for 23% of neoplasms in South American camelids in our laboratory, making this the second most common type of neoplasm after lymphosarcoma.

Key words: Histopathology; immunohistochemistry; llamas; lung; neoplasia.

Request reprints from Dr. J. A. Ramos-Vara, Animal Disease Diagnostic Laboratory, Purdue University, 406 South University Street, West Lafayette, IN 47907 (USA). E-mail: ramosja{at}purdue.edu




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