Scottsdale 2011 Melanoma Course Case Atypical proliferative nodule in a congenital nevus

    The patient was a 7-month-old male born with a giant congenital nevus involving lower back and buttock area. Within the nevus there was an irregular tan-gray to black nodular area measuring 1.4 cm in greatest dimension.  This nodular area was excised to reveal on gross examination a 0.8 x 0.5 x 0.4 cm tan-gray subcutaneous nodule. During the procedure, two enlarged and pigmented groin lymph nodes were also excised.