Case 176. 

Leishmania tropica infection (cutaneous leishmaniasis) (64 y-o M)
　 　 　 　
　 Biopsy from a 4 x 2 cm painless neck nodule with central ulceration in a Japanese man who traveled in India 　
　 　 　 　

　

 　 Electron micrograph of Leishmania tropica in the cytoplasm of a macrophage. The 3 μm-sized amastigotes contain a round nucleus with characteristic chromatin condensation, mitochondria, a blepharoplast, a kinetoplast without forming flagella, and a row of microtubules just beneath the plasma membrane.