 Good morning and hello to all. I am Dr. Chuhi Poreja, currently an Arvind resident in Radiology Department of M.P. Shah Government Medical College, Cham Nagar from Gujarat. And today I am going to present a case series on Hydrated cyst and its various locations. The aim of my study is to demonstrate various typical and atypical locations of hydrated cyst using ultrasound as a modality. Introduction. Zoonotic diseases are the diseases that spread from animals or insects to humans. Once a zoonotic disease, a kind of cocosis or hydratosis, as we know it, is one of the most important diseases which occurs in different parts of India, our country being endemic to it. Liver is the most common location of the hydrated cyst followed by the lung, with the approximate occurrence rates of 70 and 12% respectively. This is the pie chart showing the localization of hydrated cyst. Majority of the cysts are encountered in the liver, but it does not make up the entirety as lung. Spleen, cerebrum and other sides of the body, though in less numbers, are also prone to hydrated cysts. The life cycle of hydrated cyst goes as follows. Dogs or other carnivores are the definitive host of the cyst, from which the embryonated eggs are laid out in the feces. Such eggs are ingested by herbivores such as sheep, which form the intermediate host, exist in this form in lung and liver of the intermediate host, and after which this intermediate host are eaten again by the carnivores, continuing the cycle. Among these humans are the accidental, incidental, dead-end host of the hydrated cyst. Accidental in the sense that it is not necessary nor included in the conventional life cycle of hydrated cyst, and we may get infected through the feces or saliva of definitive host such as dog through direct infection. Humans are dead-end host in the sense that the infection is not transmitted from humans or the humans and the cyst cycle ends in humans itself. Materials and methods. Machine used for my study is Samsung RS80 Evo Corvilinear Pro, the ultrasound machine of our institute. The methodology of my study goes as follows. Patients referred to us from surgery department for ultrasonography for various abdominal complaints underwent routine ultrasonography. Three patients were diagnosed with hydrated cysts in different locations and findings were conveyed to surgery department for further management. The results of my study were as follows. The first patient had a well-defined tick wall cystic lesion with internal septals and echoes in left lobe of liver thus liver-hydated. In second patient, thin wall well-defined cystic lesions with internal calcific foci and ecogenic sand were seen in splinic parenchyma thus making the diagnosis as splinic-hydated and the third patient had multiple well-defined thin wall cystic lesions with internal floating ecogenic membrane and various stages of cysts were encountered in peritoneal cavity thus peritoneal hydrotidosis. The discussion goes as follows. Case 1. 55-year-male livestock breeder by occupation came with complain of epigastric pain and vomiting since 15 days. Findings on sonography were as follows. A well-defined thick wall cystic lesion with internal septals and echoes was seen in left lobe of liver. Classical liver-hydated. Another classical appearance seen in liver-hydated is the crumpled membrane or the water lily sign encountered frequently in many cases. Case 2. An 18-year-male came with complain of left-sided flank pain since 15 days. He had a history of close contact with domestic fauna. Findings on sonography were as follows. A well-defined cystic lesion with internal calcific foci and ecogenic sand was seen in splenic parenchyma. Case 3. A 58-year-old female came with complain of right hypochondria pain and episode of vomiting since 2 years. Findings on sonography were multiple well-defined thin wall cystic lesions with internal ecogenic floating membrane in peritoneal cavity were encountered. Another lesions at different stages of life cycles such as this cyst without any membrane or ecogenic content in this cyst were also encountered. Thus concluding my study, the hydrated cyst can present in any part of the body and no site is in view. These unusual locations often produce non-specific symptoms. Consequently, it is advisable to have a high degree of suspicion to consider hydrated cysts in the differential diagnosis of cystic lesions found anywhere in the body, especially in endemic countries such as ARVs. The following are the references used for my study. Thank you.