Which condition involves the discharge of mucus and tissue from the uterus?

The condition that involves the discharge of mucus and tissue from the uterus is lochia. This term specifically refers to the vaginal discharge that occurs after childbirth, characterized by a combination of blood, mucus, and uterine tissue as the body begins to heal and return to its pre-pregnancy state. Lochia typically progresses through different phases, transitioning from bright red to pink and eventually to white or yellow, reflecting the changes in the uterine lining.

Leukorrhea, while also referring to a discharge, typically describes a white or yellowish discharge from the vagina that can occur in various situations, such as during pregnancy or due to infections, rather than specifically from the uterus post-delivery. Lithiasis pertains to the formation of stones within the body, commonly in organs like the kidneys or gallbladder, and does not relate to uterine discharge. Laminectomy is a surgical procedure involving the removal of part of the vertebra to relieve pressure on the spinal cord or nerves, which is unrelated to uterine conditions. Therefore, lochia is the correct answer for the specific discharge associated with the postpartum healing process.