White spots on a goldfishes gills indicate that it is a male and in breeding condition. If the spots are on the body/fins etc it is usually the disease Ich otherwise known as white spot. This can be...
A white spot on an x-ray of the lung is also called a pulmonary nodule. A spot less than 3cm is a nodule, and larger is a mass. There are a couple reasons a pulmonary nodule would show up in the lung...