Hydatidosis — photos

Symptoms and syndromes in photos

Main » Infectious diseases » Infections Acquired through the Gastro-intestinal Tract » Hydatidosis

Adult Echinococcus granolosus.

Photo 1. Adult Echinococcus granolosus. This dog tapeworm is only about five mm long and inhabits the small intestine. Dogs are infected by eating offal of sheep, cattle or pigs containing hydatid cysts. The scolices in the cysts evaginate in the animal's intestine and mature into the adult worms. Typical taeniid eggs {see 306) are passed in the dog's faeces. (x9)

Hydatid cyst of liver.

Photo 2. Hydatid cyst of liver. From ingested eggs that hatch in the duodenum, the hooked embryos enter the circulation where they are carried to various sites. The liver is commonly affected. The hydatid cyst is usually unilocular, wjth a double wall comprised of an outer laminated layer, and an inner nucleated germinal layer. The figures show a 1150 g cyst in situ (2) and after extraction (3).

Hydatid cyst of liver(after extraction).

Photo 3. Hydatid cyst of liver (after extraction).

Daughter cysts and hydatid sand.

Photo 4. Daughter cysts and hydatid sand. The germinal layer produces brood capsules inside which grow scolices. These daughter cysts are attached to the parent cyst wall or may float free in its milky fluid contents as the so-called 'hydatid sand'. Rupture of a cyst into the tissues results in dissemination and further growth of these daughter cysts.

Hydatid cyst in brain.

Photo 5. Hydatid cyst in brain. This cyst was found in the brain of a four-year-old girl.

X-ray of lungs.

Photo 6. X-ray of lungs. Hydatid cysts of the lung are not uncommon.

Hydatidosis in human liver.

Photo 7. Hydatidosis in human liver. Multilocular, or alveolar cysts, are caused by infection with Echinococcus multilocularis. The adult of this species is found in wild canines, and the usual larval hosts are rodents. The alveolar cyst in the human liver may mimic hepatic carcinoma, but it is usually only discovered at post mortem, as in this case.

Section of alveolar hydatid cyst.

Photo 8. Section of alveolar hydatid cyst. ( x 90)

Coenurus cerebralis of sheep.

Photo 9. Coenurus cerebralis of sheep. This is the larval stage of Multiceps multiceps. The adult lives in the intestine of the dog and the 'Bladder worm' larva is usually found in the brain of sheep. Fortunately infection of man is rare.

Coenurus in human eye.

Photo 10. Coenurus in human eye. (x31)

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