Erratum to: MRI and CT of anal carcinoma: a pictorial review

In this article, Table 1 has been published in a confusing layout. We would like to clarify that the table should look as follows: Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Table 1 Tumour-node-metastasis (TNM) staging of anal carcinoma according to lesion site of origin Anal canal Anal margin Primary tumour (T) TX T0 T1 T2 T3 Primary tumour cannot be assessed No evidence of primary tumour Tumour ≤ 2 cm in greatest dimension Tumour 2-5 cm in greatest dimension Tumour > 5 cm in greatest dimension T4 Tumour of any size invading adjacent organ(s) e.g. vagina, urethra, bladder Tumour invading deeper structures (skeletal muscle, cartilage) R egional lymph nodes (N) NX N0 Regional lymph nodes cannot be assessed No regional lymph node metastasis N1 Metastasis in perirectal lymph node(s) Regional lymph node metastasis N2 N3 Metastasis in unilateral internal iliac and/or inguinal lymph node(s) Metastasis in internal iliac and perirectal lymph nodes and/or bilateral internal iliac and/or bilateral inguinal lymph nodes Distant metastasis (M) M0 M1 No distant metastasis Distant metastasis