REPORT OF A CASE
A 44-year-old man presented to our clinic for evaluation of a single asymptomatic lesion on his right flank that had been present for 4 months. He reported that the lesion had quickly arisen but had remained unchanged for the past 3 months. Physical examination revealed a 1.1×1.5-cm, erythematous, slightly scaly plaque with central clearing and atrophy (Figure 1). He had no other cutaneous lesions. He had been evaluated 2 months previously, and a biopsy had been performed on a portion of the lesion to rule out basal cell carcinoma.An excisional biopsy was performed (Figure 2 and Figure 3).What is your diagnosis?
DIAGNOSIS:
Unilesional mycosis fungoides (MF).
HISTOPATHOLOGIC FINDINGS
The biopsy specimen revealed compact orthokeratosis with a slightly atrophic epidermis. There was a dermal infiltrate of atypical, hyperchromatic lymphocytes that had convoluted nuclei with significant epidermotropism and formation of Pautrier microabscesses.