Fig. 3

Biopsy of the patient's subcutaneous nodule (4x magnification, hemtoxylin and eosin stain) showing a Taenia solium cysticercus. Cysticerci are fluid-filled cystic structures consisting of a thin bladder wall (red arrow) and a parenchymatous portion containing a scolex surrounded by a convoluted spiral canal (blue arrow). The hooks of the scolex are often only seen in few tissue sections