In this Article. In this Article. A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.
Osmosis is the scientific process of transferring fluid between molecules. When molecules move in and out of a cell to achieve the same concentration of something, like salt, on both sides, then osmosis is happening.
Phimosis Definition. Phimosis is a medical condition that is characterized by limited exposure of the glans clitoridis, the red mass of tissue that stands at the tip of the penis. This happens when the foreskin of the penis tightly sits over the aperture of the penis and cannot be retracted.