The American Society of Dermatopathology

View case study archive

Interactive Case Study - October 2019

Mass of the Shoulder

Nikki S. Vyas, MD; Allen N. Sapadin, MD; Robert G. Phelps, MD

Question 1:

A 70-year-old female presented with a 4.0 x 2.5 cm flesh-colored, firm dome shaped nodule on the left anterior shoulder, which had been slowly enlarging for a year. She endorsed full range of motion at the joint.  A 4-mm punch biopsy was sampled and histopathologic findings are shown below.
Click this image to view the virtual slide

Figure 1

Figure 2. 

Figure 3

Figure 4

Figure 5

Which of the following is the best diagnosis?