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84-Year-Old Female with Erythematous Plaque

Can you diagnose this case?

Mounts A, Peters KM. An erythematous plaque in an 84-year-old woman.. Consultant360.

Signs and Symptoms

An 84-year-old Filipina with no personal or known family history of skin cancer presented to the dermatology clinic with a lesion on her lower back that had been present for the past 5 years. She reported insidious growth and mild pruritus associated with the lesion over the past few months.

Physical Examination

Physical examination demonstrated a 7.5 × 4.5-cm sharply defined erythematous plaque with scattered scale and interspersed nodular areas on the woman’s medial lower back.

What’s your diagnosis?

Choose one to reveal diagnosis and discussion

Tinea corporis
Basal cell carcinoma
Lepromatous leprosy
Cutaneous T-cell lymphoma

Answer: Basal cell carcinoma

See the full case at Consultant360


The diagnosis of basal cell carcinoma was determined via biopsy. The patient was referred for Mohs surgery because she met the published appropriate use criteria for having a nodular basal cell larger than 2 cm.1 The criteria take into account multiple factors to determine whether Mohs micrographic surgery is indicated in the treatment of cutaneous neoplasms. These factors include area of body, patient characteristics, tumor characteristics, and size.


1. AAD/ACMS/ASDSA/ASMS 2012 appropriate use criteria for Mohs micrographic surgery: a report of the American Academy of Dermatology, American College of Mohs Surgery, American Society for Dermatologic Surgery Association, and the American Society for Mohs Surgery. Dermatol Surg. 2012;38(10):1582-1603.


Alexander Mounts, DO US Naval Flight Surgeon, Naval Medical Center San Diego, California

Kristopher M. Peters, DO Staff Dermatologist, Madigan Army Medical Center, Joint Base Lewis-McChord, Washington