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Dacryocyst edema

Edema of a dacryocyst (hydrops sacci lacrimalis) – expansion of a dacryocyst when thinning skin over it and filling of his cavity mucous viscous contents, appearing in the form of a complication of a chronic dacryocystitis; it is caused by an obliteration of the lacrimal tubules and a nasal duct.

 
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In operating time our brain spends the amount of energy equal to the 10 Watts bulb. So the image of a bulb over the head at the time of emergence of an interesting thought is not so far from the truth.