Answer to Case 305

Answer:  Clonorchis sinensis, the Chinese liver fluke. As mentioned by Florida Fan and Tomáš Macháček, we can see several characteristic features of C. sinensis, including the oral sucker, esophagus, twin ceca, ova-filled uterus, lateral vitellaria, seminal receptacle and classic eggs with shouldered operculum (arrow heads).  I've highlighted several of these features below:The testes and other internal structures allow Clonorchis to be differentiated from the related fluke Opsithorchis.  Clonorchiasis is usually acquired through ingestion of undercooked or raw fish and long standing disease may cause cholangiocarcinoma (possibly explaining the patient's liver mass in this case).And now our poem from Blaine Mathison:When you see such small eggs with an operculumdon't get caught up in a parasitological conundrum!the testes branching out like a treesupports a diagnosis of Clonorchis, can't you seeas does travel to Korea, where the patient hails from!
Source: Creepy Dreadful Wonderful Parasites - Category: Pathologists Source Type: blogs