Figure 2

Histopathological findings. A. The lesion is composed of variable-sized tubulo-cystic structures embedded in subcutaneous tissue. Hematoxylin and eosin (HE) stain: 12.5×. B. A number of parasite ova are observed in the necrotic tissue inside the cystic structures. The shell thickness of ova is uneven and some are distorted. The ova contain several cells with round nuclei and eosinophilic cytoplasm, suggesting yolk cells (inset, 400×). HE stain: 200×. C. Egg shells of Paragonimus westermani are highlighted under polarized light in the same field as shown in B: 200×. D. The cyst wall with a granulomatous change and scant infiltration of eosinophils. HE stain: 400×. E. The section of the worm shows characteristics of trematode, the presumed oral sucker (arrow) and reproductive organ (arrow head). HE stain: 40×.