Unilocular Hyadit Cyst

Question 1

Other name
Type

Answer 1

1- echinnocucs granulosus
2- dog tape worm

Cestode

Question 2

Geo

Answer 2

Cosmopolitan especially with areas in contact with dogs

Question 3

Morpho

Answer 3

1- scolex has a rostullem and hooks
2- 3 segments ( immature , mature containg testis and ovary , gravid containg eggs)

Question 4

Life cycle

Answer 4

(6)
1- adults live in small intestine of dogs and carnivores animal
2- gravid segment/ proglottids pass in their feces
3- they contaminate food / water and it is ingested then by intermediate host ( human - rabbit- cattle - pig - camel - sheep)
4- egg hatches into onchospere penetrates intestinal wall to other organs ( liver - lung - kidney - brain- bone) becoming hydait cyst
5- human is a end blind host
6- dogs are infected by eating meats of its intermediates containg hydait cyst

Question 5

Structure of hydatid cyst

Answer 5

Walls
- inner germinal layer ( endocyst)
- laminated layer ( exocyst)
- outer fibrous layer ( host immune reaction )

Contents
- hydatid fluid : highly immunogenic
- scolics
- brood capsules ( germinal layer containing scolex
- daughter cysts ( laminted layer surrounding brood capsules )

Contents may keep attached to wall or fall forming hydatid sands

Question 6

Patho

Answer 6

5+2
- inflammatory reaction ~> encapsulation of cyst ~> mechanical pressure inside organ

• rupture of the cyst ~> fluid ~> severe allery reaction ~> anaphylactic shock ~> death if significant amout

1- liver ( 66% ) (4) : asymptomatic until complicated
- anaphylactic shock
- liver failure
- biliary obstruction
- jaundice

2- lung ( 22%)(4 ~> 4) :
- pneumothorax
- pleuritis
- lung abscess ( 2 nd bacterial infection)
- rupture in main bronchus
• cough
• dyspnea
• hemoptysis
• rusty sputum with hydatid fluid

3- kidney (2)
- hematouria
- hydatid fluid in urine

4- brain
+ intra cranial pressure

5- bone
Destruction of bones

Question 7

Diagnosis

Answer 7

• history : related to dog ?
• clinical
• laboratory (6)
• NO ASPIRATION
• NO ADULTS /EGG ARE FOUND IN HUMAN
• ultrasound on infected organs to observe hydatid cyst
• ELISA
• CBC : eosinophilia
• intradermal test of casoni
  Injection of hydatid material in forarm and then observe for 20 min ( immediate hypersensitivity then its positive )

Question 8

Treatment

Answer 8

3
1- drugs : albendazole for 3 months
2- surgical removel of cyst
3- PAIR ( percutunous Aspiration of fluid - INJECTION of formalin ( scolicidal ) Reaspiration )
To prevent anaphylaxis and metastasis ( scolex)

Question 9

Prevention

Answer 9

(4)
1- reduce contact between dogs and intermediate host
2- dogs must be regularly treated / kept away from slaughter houses
3- health eduction
4- protection of food

Question 10

Inhabitants- diagnostic - infective - definitve - intermediate - mode of infection 🛑‼️روحي اتاكدي

Answer 10

Small intestine - cyst- eggs - dog / carnivorous- man / rabbit/ sheep/ cattle / camel/ pig - ingestion of meat contaminated by egg