The correct answer is C. T2a.

According to the AJCC tumor staging system, the correct answer is T2a. The Breslow depth being 1.3mm with no ulceration is in line with tumor stage T2a.

The lesion has no evidence of ulceration from the image, therefore making T2b incorrect.  T1 is reserved for tumors less than or equal to 0.8mm to be classified as T1a, and less than or equal to 0.8mm with ulceration or 0.8- 1mm without ulceration for T1b. T3 tumors require a depth of 2mm or more for this designation.

References:

Gershenwald JE, Scolyer RA, Hess KR, et al. Melanoma staging: Evidence-based changes in the American Joint Committee on Cancer eighth edition cancer staging manual. CA Cancer J Clin. 2017;67(6):472-492. doi:10.3322/caac.21409. https://pubmed.ncbi.nlm.nih.gov/29028110/

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