Presenter: Joseph Del Priore, DO
Dermatology Program: Western University/ Pacific Hospital
Program Director: David C. Horowitz, DO FACD
Submitted on: Jan 21, 2011
CHIEF COMPLAINT: Bump on arm
Signs and symptoms: A 19 year old male presented with a pink, shiny 3 cm protuberant nodule on his right upper extremity that grew rapidly over 2 months.
Previous Treatment: tea tree oil
Other information: none
Solitary 3.2cm well circumscribed, shiny pink nodule on right upper arm that is hard and slightly painful upon palpation. (figure 1)
Histopathological examination (see figures 2 and 3) showed sections of nests of cells, some of which presented with a basaloid appearance with regular crowded oval nuclei. There were also associated ghost cells with residual eosinophilic cytoplasm and without preserved nuclei. Scattered chronic inflammatory cells along with multinucleated giant cells and a focus of calcification was present. No evidence of malignancy was identified.
1. Dermatofibrosarcoma protuberans
2. Pilomatricoma / pilomatrical carcinoma