In this presentation, extramedullary plasmacytoma and squamous cell carcinoma in the left region of the root of the tongue of a 4-year-old female tabby cat were described by histopathological findings. In physical examination of the cat, which were brought to the Selcuk University Veterinary Faculty Internal Medicine Department with the complaint of difficulty in swallowing and breathing, salivation, and halitosis, a mass was observed in the posterior left part of the tongue. To examine the mass, the animal that is wanted to be anesthetized and died during intubation is referred to the pathology department for necropsy. Following the standard pathological procedure, the samples extracted from this mass were embedded into paraffin blocks after being fixed in a 10% formalin solution. Hematoxylin-eosin, methyl green pyronin, and Congo Red were then used to stain 5-micron-thick sections, which were then seen under a light microscope. In microscopic examination revealed that tumour cells were round and had eosinophilic cytoplasm. Furthermore, islands constituted by atypical tumor cells and single cell keratinization were identified. Plasma cell clusters were detected throughout the tumor mass. Invasion of lymphatic vessels by squamous cells and plasma cells was observed. Amyloid deposits were also observed in the heart and spleen. In conclusion, the presence of both squamous cell carcinoma and extramedullary plasmacytoma was observed in the mass by macroscopic and microscopic examinations. As the observation of these two types of tumors in the oral region in cats is quite unusual, this case was deemed worthy of reporting.
Bulut et al. (Wed,) studied this question.