Hematoxylin-eosin–stained sections (Figure 2and Figure 3) demonstrated a fibrous nodule lined by deep invaginations of matrical epithelium in juxtaposition to the underside of the nail plate. The stroma was populated by a proliferation of small spindle cells with slightly wavy, uniform nuclei. Pleomorphism, nuclear atypia, and mitotic figures were not identified. With the clinical and histologic features, the patient was diagnosed as having onychomatricoma.
CARRIE ANN RC, SENAIT ANN WD, MOLLY AH, VINCENT L. Subungual Tumor in a 66-Year-Old Woman—Diagnosis. Arch Dermatol. 2010;146(8):911-916. doi:10.1001/archdermatol.2010.174-b