uterine agenesis
Its called a "D and C" (D&C)
Catheterization is the medical term meaning insertion of a tube into a duct or cavity.
The lung cavity is called the pleural cavity.
Pelvic
'Cavity' means a hollow space. Combining forms meaning 'hollow' include: cav/i, cav/o, cavern/o, concav/o. -cele is the medical terminology suffix meaning hollow cavity.
synovial cavity
Effusion is the medical term meaning escape of fluid into a body cavity. So, for instance, escape of fluid into the pleural space is pleural effusion.
Although, there is also the cervical cavity, but since you were asking for the "main" cavity, I would say it's the uterine cavity.
The cavity that you are referring to is know as the thoracic cavity.The ventral body cavity contains the organs in the chest and abdomen.Thoracic cavity
The hilum is the region of lymph tissue in the chest cavity.
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cav/i or cav/o