EXTENSIVE BLUE PATCHLIKE PIGMENTATION

Abstract
THE BLUE nevus, a usually benign lesion, has received increasing attention since Tièche1originally described it, in 1906, as benign melanoma. Special attention to this entity in this country was slight until 1939, when Montgomery and Kahler2published their complete review of this subject. Since there is little to be gained by resurvey of the literature, we suggest that if histologic criteria are diagnostic of blue nevus, our clinical concept of this condition would seem to require enlargement to include variants of the original description. The literature indicates that such thinking has already occurred, but has not been emphasized sufficiently. Tièche's comparison of blue nevus and Mongolian blue spot as well as more recent reports describing extensive plaquelike blue nevus are in point. Before describing this morphologic variant of which we believe our case is a good example, we shall summarize briefly the generally accepted clinical and pathologic

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