“…These structures were accompanied by a thin stroma consisting of capillaries and connective tissue, tumor cells were undifferentiated, multilobulated and polygonal, pleomorphism and hyperchromatic nuclei and invasive to surrounding glandular tissues, the primary tumor most commonly appeared as a deep-seated, firm, nodular perianal mass ventrolateral to the anus and involving, or within close proximity to the anal sac. Tumors were unilateral and typically [1][2][3] cm in diameter (range, 0.5-3 cm). …”