what are isolated pulmonary nodules
Pulmonary nodules are small, focal, radiographic opacities that may be solitary or multiple. A classic solitary pulmonary nodule (SPN) is a single, spherical, well-circumscribed, radiographic opacity measuring less than or equal to 30 mm in diameter and is surrounded completely by aerated lung.The SPN is a coined term that in the past described solitary nodules detected incidentally by chest radiography (CXR). classic solitary pulmonary nodule (SPN) is a single, spherical, well-circumscribed, radiographic opacity measuring less than or equal to 30 mm in diameter and is surrounded completely by aerated lung. The SPN is a coined term that in the past described solitary nodules detected incidentally by chest radiography (CXR).