A "treasure" of Northern Ireland's countryside has had a bumper year, thanks to warm weather and conservation efforts. The Marsh Fritillary butterfly used to be widespread across the UK and Ireland ...

If your doctor tells you that you have cystic lung disease, it means you have one of a group of conditions that cause lung cysts -- sacs of tissue filled with air or fluid. Treatments can help, but ...

A urachal cyst is a sac of tissue and fluid between the bladder and the belly button, which can sometimes cause discomfort or symptoms if it drains. An infected urachal cyst can pierce the bladder or ...

Dermoid cysts are closed sacs that form in or on the skin. They may contain fluid or pus. Dermoid cysts are common. Most often, they are on the face, scalp or upper chest. These cysts sometimes extend ...

Hemorrhagic ovarian cysts are blood-filled sacs that often form during the menstrual cycle and usually resolve on their own. It's important to see a healthcare provider if you experience severe pain, ...

Correspondence to Dr Tetsuro Araki, Department of Radiology, Center for Pulmonary Functional Imaging, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St., Boston, MA 02215, USA; ...