phantom tumour
(US phantom tumor) Medicine
noun
(Originally) a mass in the abdomen resembling a tumour, usually attributed to abnormal contraction of the abdominal musculature; (later also) any of various other conditions simulating neoplasms, especially a loculated pleural effusion resembling a lung tumour on X-ray.
Origin
Mid 19th century; earliest use found in Thomas Watson (1792–1882), physician.