Cytomorphological Study of Canine Transmissible Venereal Tumor

Introduction Canine transmissible venereal tumor (CTVT) is classified as a round cell tumor. It always revealed in round to ovoid shaped cell, moderate amount of vacuolated cytoplasm with a large round to ovoid nucleus and prominent nucleoli (2). However, Amaral et al. (2007) reported that CTVT cytomorphology was classified into three types according to the majority of cell type population: plasmacytic, lymphocytic and mixed type (1). Moreover, plasmacytoid cell type was found to be related to malignant property and increased resistance to chemotherapeutic treatment (5). Our objective was to study the CTVT cell type in Thai dogs and the relation between cytomorphological characteristics and clinical treatment information.