From Wikipedia, the free encyclopedia. The following is a list of the world's largest cruise ships over 100,000 gross tonnes, including ships that are in service, under construction, and out of service.Ships are ranked by gross tonnage.rom Wikipedia, the free encyclopedia. The following is a list of the world's largest cruise ships over 100,000 gross tonnes, including ships that are in service, under construction, and out of service. Ships are ranked by gross tonnage.
Advanced clubbing is obvious, but early clubbing may be difficult to diagnose. Clubbing is present if the transverse diameter of the base of the fingernail is greater than the transverse diameter of the most distal joint of the digit. The nail base angle measures more than 160Â°.
Second, cyanosis (blue color) in the nails can be a sign of a problem with the heart or lungs. Again, this would be very unlikely in the absence of other symptoms, such as shortness of breath or chest pain or palpitations. Finally, high red blood cell counts, called polycythemia, may cause this discoloration.