NCCN Guidelines for Patients® | Melanoma

30 NCCN Guidelines for Patients ® : Melanoma, 2018 3  Melanoma staging TNM scores T = Tumor The T category tells you how thick the primary tumor is. The T category is given a score from 1 to 4 based on how deep the tumor has grown into the skin, measured in mm ( m illi m eters). See Figure 9 . The sharp point of a pencil is about 1 mm. For T1 to T4 melanomas, subcategories are given based on the ulceration. The ulceration status tells whether or not the tumor’s top skin layer is present and intact (not ulcerated) or is broken or missing (ulcerated). † † TX means thickness can’t be assessed. † † T0 means there is no evidence of a primary tumor. † † Tis means there are abnormal cells in the epidermis only. † † T1 tumors are ≤1.0 mm thick. • T1a tumors are <0.8 mm thick and do not have ulceration. • T1b tumors are <0.8 mm thick and have ulceration, or are 0.8 to 1.0 mm thick and with or without ulceration. † † T2 tumors are >1.0 to 2.0 mm thick. • T2a tumors are >1.0 to 2.0 mm thick and do not have ulceration. • T2b tumors are >1.0 to 2.0 mm thick and have ulceration. † † T3 tumors are 2.0 to 4.0 mm thick. • T3a tumors are 2.0 to 4.0 mm thick and do not have ulceration. • T3b tumors are 2.0 to 4.0 mm thick and have ulceration. † † T4 tumors are >4.0 mm thick. • T4a tumors are >4.0 mm thick and do not have ulceration. • T4b tumors are >4.0 mm thick and have ulceration. Figure 9 Growth of melanoma into the skin The T category is given a score from 1 to 4 based on how deep the melanoma tumor has grown into the skin. Illustration Copyright © 2017 Nucleus Medical Media, All rights reserved. www.nucleusinc.com

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