The American Society of Dermatopathology

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Interactive Case Study - December 2020

Asymptomatic linear cluster of papules on the back of a 72-year-old female

Sheshanna Phan, OMS; Rummit Dhillon, OMS IV; Narciss Mobini, MD

Question 1:

A 72-year-old female presented with a 4.0 cm linear cluster of flesh-colored papules on the left upper back (Figure 1). The lesions have been present since childhood and remained largely asymptomatic with slight increase in size and number over time. A biopsy was performed (Figures 2A-E).

Click the image below to view the virtual slide.

Figure 1.

Figure 2A.

Figure 2B.

Figure 2C.

Figure 2D.

Figure 2E.

Which of the following is the most likely diagnosis?