A 37 year old female has a contracture involving the third digit of her left hand that prevents her from fully extending this finger. The lesion has gradually developed over the past 6 months. A firm, hard, cordlike, 1x3 cm area is palpable beneath the skin of the left palm. Histologically this mass is most likely to be composed of
Calcification Malignant cells Caseous Material Fibroblast