Asymptomatic nodule on the scalp
2 Consultant Dermatologist, Nirmaya Hospital, Mumbai, India
Swapnil A Sanghavi
Department of Skin and VD Seth G. S. Medical College and KEM Hospital, Parel, Mumbai - 400 012
|How to cite this article:
Sanghavi SA, Dongre AM, Oswal P, Khopkar US. Asymptomatic nodule on the scalp. Indian J Dermatol Venereol Leprol 2013;79:271-272
A 60-year-old male presented to our outpatient department with an asymptomatic raised lesion on the left side of the scalp for 2 years. The lesion was slowly increasing in size. There was no history of similar lesions elsewhere on the scalp or on the body. On examination, a single skin colored, firm, non-tender 1 cm sized nodule with slight scaling was seen over the left parietal scalp. There was no umbilication. Hair follicles were seen emerging from the nodule [Figure - 1]. Rest of the examination was unremarkable. A biopsy was obtained for histological diagnosis.
|Figure 1: Asymptomatic nodule on the scalp|
Histopathological examination showed focal invagination of the epidermis covered by a parakeratotic plug. It was surrounded by hyperplastic epidermis with papillomatosis and hypergranulosis [Figure - 2]. There was a suprabasal cleft with formation of villi protruding into the cleft [Figure - 3]. Acantholytic cells could be seen in the cleft along with the presence of dyskeratotic cells [Figure - 4]. Mild lymphocytic infiltrate was seen in the superficial dermis.
|Figure 2: Focal invagination of the epidermis with parakeratotic plug (H and E, ×100)|
|Figure 3: Suprabasal cleft with formation of villi protruding into the cleft (H and E, ×200)|
|Figure 4: Presence of acantholytic (black arrows) and dyskeratotic cells (red arrows) (H and E, ×400)|
What is your Diagnosis?
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