Kopf Alfred W, Rabinovitz Harold, Marghoob Ashfaq, Braun Ralph P, Wang Steven, Oliviero Margaret, Polsky David
Ronald O. Perelman Department of Dermatology, New York University School of Medicine, New York, New York, USA.
J Am Acad Dermatol. 2006 Dec;55(6):1089-91. doi: 10.1016/j.jaad.2006.08.028. Epub 2006 Oct 20.
"Fat fingers" are thick digitate linear, curvilinear, branched, or oval/circular dermoscopic structures typically seen in seborrheic keratoses where they represent the gyri of their cerebriform surfaces. Their recognition is very useful in the diagnosis of these lesions, especially when the classic features (eg, milia, comedo-like openings) are absent. Histologically and by confocal microscopy the "fat finger" gyri are accentuated by pigmented keratin filling the sulci. "Fat fingers" must be differentiated from other linear structures such as "network-like structures"; branched streaks; network; globules; pigmented ovoid-nests; and streaks/pseudopods seen in different melanocytic and non-melanocytic lesions.
