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Note what signs you see.
I (W. Wertelecki, M.D.) see a giant congenital melanocytic Nevus (GCMN), more often refer to (erroneously) as bathing trunk nevus. In essence, this condition is a neuro-cutaneous melanocytosis or dysplasia. GCMN is a high cancer risk syndrome (over 1% of patients develop a melanoma).
This image illustrates the post-surgical resection of a large portion of an extensive GCMN (an attempt diminish the cancer risk and deformation associated with a post-natal growth of these hamartomas). Please, see the pre-operative image in this patient’s gallery of images.
PERSPECTIVE: this congenital variously pigmented and often hairy (moles) hamartomas pose a challenge to understand the pathogenesis – after birth the nevi increase in number and size (referred to as “tardive” “satellite” manifestations).