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cyst
Thyroglossal duct carcinoma, which is usually diagnosed postoperatively, is a rare malignant tumor arising in the thyroglossal duct cyst.
      
Two cases were diagnosed as thyroglossal duct cyst prior to the operation, the remaining one as dermoid cyst.
      
Primary thyroglossal duct carcinoma should conform to the following criteria: localization of the carcinoma to a clearly demonstrable thyroglossal duct cyst or tract; clinically or histologically confirmed absence of carcinoma of the thyroid gland.
      
The obligatory heterogenous tissue cyst-forming coccidia of the genus Sarcystosis are regarded as an excellent example of the specific coexistence of two organisms, i.e., the host and parasite.
      
Of special interest is the parasite's ability to persist in this host at the stage of tissue cyst or sarcocyst.
      
This is a giant meront, in which unidirectional development proceeds starting from a little differentiated metrocyte, through intermediate cells, and towards highly differentiated cyst merozoites (gamonts) unable to further divide.
      
The life span of the sarcocyst depends, to a great extent, on self-regulation within the cyst itself and on relations between the cyst and its immediate environment.
      
A totally new field of research into Sarcocystis was initiated by the discovery that the intracellular parasite damages both cyst harboring and intact muscle cells, apart from the adjacent connective and nervous tissue.
      
Seven different morphostructural types of nanoforms of vegetative cells, as well as nanospores and cyst-like cells were described, potentially representing new species of ultramicrobacteria.
      
The total concentration of dinocysts varies from single cysts to 25 000 cyst/g of dry sediments, which reflects the biological productivity in the White Sea waters and the regional particular features of the sedimentation processes.
      
Following withdrawal of the scolex the lining separates the parenchyma of the turned neck from the cyst tissues and remains AChE-positive during the whole life of the parasite, i.e.
      
The role played by non-neural AChE associated with the cyst cavity lining is unknown, but seems to regulate both the transport of nutrients and minerals into the scolex and waste substances in the opposite direction.
      
The accumulation of neutral lipids in the cells predetermined to evolve into the cyst cavity lining in Hymenolepis diminuta cysticercoids is presented.
      
In the pre-encystment stage of the cysticercoids the cells concentrated around the cavity of the prospective cyst.
      
Primary intracranial extradural hydatid cyst localized in the supra-and infra-tentorium
      
There are few case reports of primary muscle cystic echinococcosis in which a hot abscess developed at the site of the cyst following its perforation.
      
Here, the author presents a 23-year-old female with a hydatid cyst of more than 15 years' duration in her right quadriceps muscle.
      
The cyst did not cause any complaints for years and grew very slowly, but eventually became infected and perforated.
      
In most cases (53.2 % of the patients) a single cyst was found but 46.8 % of the patients had multiple cyst formations (from 2 to 9 cysts) located in the liver.
      
verulamii, the body of the cysticercoid with invaginated scolex armed with a double crown of rostellar hooks was completely surrounded by the cercomer, which appears to be separated from the cyst and scolex.
      
 

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