Ameboma (Amoeboma)

An ameboma is a tumor that develops in the rectum or colon due to the parasitic protozoan Entamoeba histolytica. These protozoa invade and destroy the intestinal walls. Ameboma can ulcerate and become infected with purulent (pyogenic) bacteria, which cause active inflammation of the intestinal walls. The tumor usually hardens and can even block the intestines.

An amoeboid tumor, or ameboma, occurs due to helminthic infestation caused by parasitism of Protozoa. This dangerous complication of helminthic infection can cause bleeding, peritonitis, or intestinal obstruction due to encapsulation of the parasite. The epizootology of an amoeboid tumor depends on the nature of the diet and the associated amount of arsenic consumed in food, as well as other components included in the feed used by the animal. This is associated with an increase in neoplasms in different animal species to varying degrees: artiodactyls (up to 60%), ruminants (18-35%).

Amoebic infestation predominantly affects pigs - 6 times more often than cattle, and birds - several times more often than rabbits and cats. In humans, amebiasis (amebic dysentery) is usually observed during the rainy season and worsens during dry periods. The maximum number of cases in children and adults leading a wandering lifestyle and eating exogenous food is the maximum among Vietnamese pigs and dogs - inhabitants of rice and garbage dumps. Stray dogs have up to five times higher incidence of this disease compared to all other animals. At the same time, dogs themselves become infected from humans, domestic animals, rodents, rats, which, due to natural parasitocenosis, are the main carriers of invasion in nature. Amoebic dysentery is most often characterized by fatal outcomes.