Superficial acral fibromyxoma of horn : A rare neoplasm and histomorphological entity in an Indian bullock

A four year non-descript bullock was presented to Veterinary Clinical Complex, Veterinary College and Research Institute, Orathanadu, TANUVAS, Tamilnadu with a history of slow growing mass near the base of the left horn. On examination, a protruding, whitish grey, smooth and soft, unlobulated mass was noticed on the body of the left horn. Biopsy specimen was collected and preserved. Histologically, the tissue consisted of mixed population of repetitively arranged fibroblast in whorls with prominent nuclei and stellate cells with cytoplasmic tails. Abundant collagenous and mucinous stroma were present. Abnormal mitotic figures were absent. On special staining, collagenous stroma was more prominent in Masson’s trichrome and blue stained mucinous stroma was seen in Alcian blue technique. Based on the histological features the case was diagnosed as acral fibromyxoma. The case describes the first incidence of fibromyxoma in horn of Indian cattle.