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Quiz
2013:79:2;271-272
doi: 10.4103/0378-6323.107679

Asymptomatic nodule on the scalp

Swapnil A Sanghavi1 , Atul M Dongre1 , Prateek Oswal2 , Uday S Khopkar1
1 Department of Dermatology, Seth G. S. Medical College and KEM Hospital, Parel, Mumbai, India
2 Consultant Dermatologist, Nirmaya Hospital, Mumbai, India

Correspondence Address:
Swapnil A Sanghavi
Department of Skin and VD Seth G. S. Medical College and KEM Hospital, Parel, Mumbai - 400 012
India
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
Copyright: (C)2013 Indian Journal of Dermatology, Venereology, and Leprology

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)

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