A full appreciation of what D. 4h. symmetry implies requires the visualization of the symmetry elements and operations as well as. an understanding of groups. In the following two sections, the various symmetry operations and. groups will be discussed while the point group definitions are given in section I.4.
Dermoid cysts are slow growing and may not be noticed until a child is older or an adult. The effect a dermoid cyst will have on a person will depend on the location, for example, fertility problems with ovarian dermoid cysts. Some dermoid cysts may not require treatment, while others may need surgical removal. The type of specialist to carry out this procedure will depend on where the cyst is in the body.
Surgery to remove nasal polyps may be recommended if steroid medication doesn't help or your polyps are particularly large. The procedure to remove nasal polyps is called endoscopic sinus surgery. It's carried out under general anaesthetic, sometimes as a day procedure. The surgeon will pass an endoscope (a tube with a video camera at one end) into your nostrils to allow them to see inside your nose and sinuses.