TitleLymphoma Classification in Goats.
Publication TypeJournal Article
Year of Publication2017
AuthorsKiser, PK, Löhr, CV
JournalVet Pathol
Volume54
Issue4
Pagination611-619
Date Published2017 07
ISSN1544-2217
KeywordsAnimals, Female, Goat Diseases, Goats, Lymph Nodes, Lymphoma, Lymphoma, B-Cell, Lymphoma, Large B-Cell, Diffuse, Lymphoma, T-Cell, Male, Precursor Cell Lymphoblastic Leukemia-Lymphoma
Abstract

Lymphoma has been described in individual cases for goats but not systematically characterized in a larger cohort. This study aimed to subtype caprine lymphoma based on topographic and subgross distribution, immunophenotype, and cellular morphology following the World Health Organization classification system for hematopoietic tumors in domestic animals. Fifteen caprine lymphoma cases were assessed with 6 submitted as biopsy and 9 for postmortem examination. Goats were predominantly young adult (median 3 years) and dwarf breeds (Pygmy and Pygora). The sexes were similarly represented. Nuclear size was measured relative to red blood cells (RBCs) and then adjusted for species-specific differences and designated small (<3× RBCs), intermediate (3-4× RBCs), or large (>4× RBCs). Using immunohistochemistry, 11 of 15 (73%) goats had T-cell lymphoma (TCL; CD3 positive, CD79α negative) and 4 of 15 (27%) had B-cell lymphoma (BCL; CD79α positive, CD3 negative). A multicentric distribution was most common. TCL generally involved the thoracic cavity and/or neck, suggestive of thymic origin or homing. TCLs were further classified as lymphoblastic lymphomas (3/11; 27%), large granular lymphocyte lymphoma (1/11; 9%), diffuse small lymphocytic lymphomas (3/11; 27%), or peripheral/mature T-cell lymphoma (PTCL) not otherwise specified (4/11 [36%], of which 3 were high grade and 1 intermediate grade). In 1 goat with PTCL, lymph nodes had either paracortical expansion or diffuse infiltrates suggesting transition from nodular to diffuse PTLC. BCLs were classified as diffuse large B-cell lymphoma (2/4; 50%) or B-cell lymphocytic lymphoma intermediate type (2/4; 50%). In contrast to dogs and horses, lymphomas in goats are predominantly TCL and frequently involve the mediastinum.

DOI10.1177/0300985817699859
Alternate JournalVet. Pathol.
PubMed ID28382854
Grant ListP30 ES000210 / ES / NIEHS NIH HHS / United States