synonym for a cystic (liquid-filled) growth or solid neoplasm (cancerous or non-cancerous), with other forms of swelling often referred to as "swellings". Related terms occur commonly in the medical literature, where the nouns tumefaction and tumescence (derived from the adjective tumescent) are current medical terms for non-neoplastic swelling. This type of swelling is most often caused by inflammation caused by trauma, infection, and other factors. Tumors may be caused by conditions other than an overgrowth of neoplastic cells, however. Cysts (such as sebaceous cysts) are also referred to as tumors, even though they have no neoplastic cells. This is standard in medical-billing terminology (especially when billing for a growth whose pathology has yet to be determined). See also Somatic evolution in cancer List of biological development disorders Epidemiology of cancer Pleomorphism References External links Anatomical pathology Medical signs Oncology Surgical removal procedures fi:Kasvain