He has no other complaints. He is healthy with no significant medical problems. He takes no medications. On physical examination, his vital signs are normal. Chest exam is unremarkable.
Abdominal exam is normal.
On examination of the extremities, there is a 1.5 cm pigmented lesion on the right lateral aspect of his distal thigh. There are no other pigmented lesions noted. Examination of the groins reveals no adenopathy. An excisional biopsy is performed under local anesthesia revealing a Clark's level 3 melanoma with a thickness of 2 mm. Compare and contrast the Clark's system with the Breslow's system for classification of melanomas with regard to their usefulness in management and outcome prediction.