T cell lymphoma in the atrium of a young bull

In this report, T-cell lymphoma in the atrium of a 1.5-year-old Holstein bull is described. Macro-scopically, a large white to a yellow tumour mass with a size of 4.5×3.5×2 cm was observed in the left atrium. Histopathological examination revealed extensive infiltration of medium- to large-sized lymphocytic cells with round to oval nuclei and stippled chromatin, surrounded by a narrow rim of pale eosinophilic cytoplasm. Immunohistochemically, the tumour cells indicated positivity with CD3 and Ki-67, but negativity with CD79α, CD20 and S100. On the basis of the histologic and immuno-histochemical findings, this tumour was diagnosed as a T-cell lymphoma

Lacrimal gland adenoma in a sheep

The lacrimal gland is a diamond-shaped, tubuloalveolar gland that secretes the serous component of tears. A four-year-old female crossbreed sheep suffering from left eye protrusion was referred to a Veterinary Hospital. Ophthalmic examination revealed epiphora, superficial ulcerative keratitis, cor-neal edema and neovascularisation. Moreover, ultrasound examination showed a large heterogeneous mass with variable reflectivity in the intraconal and extraconal spaces. Grossly, a 2.5×1.5×0.5 cm oval firm grayish mass was observed. Histopathologically, the mass was composed mainly by tubules with two cell types including cuboidal luminal epithelial cells and peripheral myoepithelial cells. The tubular structures were separated by proliferating myoepithelial cells. Mitotic figures, cellular pleomorphism and atypia were not seen. Immunohistochemically, most of the luminal epithelial cells showed an immunopositive reaction with a cytokeratin (AE1/AE3) marker. On the basis of these findings, the mass was diagnosed as a lacrimal gland adenoma

Perineal squamous cell carcinoma in a goat: A case report

A 4.5-year old female native Iranian goat was presented with history of an irregularly shaped and cauliflower-like non ulcerated mass that affected the perineum which gradually increased in size. The tumour covered the entire orifice of the anus and extended to the dorsal aspect of the vulva. The mass were excised from the base. On cut-section, reddish white fleshy soft surface with 4×3.5×1 cm dimensions was observed. The enlarging tissue appeared 3 months earlier to presentation as a small neoplastic tissue. The peripheral lymph nodes were normal. There was no evidence of another cutaneous lesion or of metastasis to other organs. Histopathological examination revealed a well-differentiated squamous cell carcinoma displaying central pearls of keratin and a dense fibrous stroma. The tumour cell was large and had an abundant eosinophilic cytoplasm with slightly enlarged hyperchromatic nuclei. They will often produce large amounts of keratin, resulting in the formation of extracellular keratin pearls. Tumour cells showed hyperchromatism and mitotic figure in some areas. Based on histopathological characteristics the tumour was diagnosed as squamous cell carcinoma