Phenotypic abnormality Neoplasm UMLS:C0027651 An organ or organ-system abnormality that consists of uncontrolled autonomous cell-proliferation which can occur in any part of the body as a benign or malignant neoplasm (tumor). Oncology SNOMEDCT_US:108369006 Abnormal tissue mass Tumor MSH:D009369 Oncological abnormality Neoplasia UMLS:C0006826 HP:0002664 HP:0003008 Cancer NCIT:C3262 SNOMEDCT_US:363346000 The World Health Organization (WHO) classifies neoplasms into four main groups: (i) benign neoplasm, (ii) in situ neoplasm, (iii) malignant neoplasm, and (iv) neoplasm of uncertain or unknown behavior. A malignant neoplasm is also known as cancer. Tumour HP:0006741