Abstract
A 77-year-old man with a history of nodular basal cell carcinoma excised from the scalp 5 years prior presented with complaints of scalp tenderness for the past three weeks. Examination yielded a well-healed scar with surface scale. The initial stage showed a parakeratotic epithelium (Fig. 30.1) subtended by a deep dermal scar and a basophilic-staining subcutaneous nodule (Fig. 30.2). The nodule is vaguely rounded and partially surrounded by an eosinophilic capsule (Fig. 30.3). The cells are densely chromatic, lack palisading, and are admixed with vacuolated cells (Fig. 30.4). The correct diagnosis is:
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(a)
Lymph node
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(b)
Basal cell carcinoma
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(c)
Benign follicular hamartoma
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(d)
Trichoepithelioma
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Thornhill, R.S., Asher, N. (2018). Blue Ball in the Dermis. In: Morgan, M., Spencer, J., Hamill, Jr., J., Thornhill, R. (eds) Atlas of Mohs and Frozen Section Cutaneous Pathology. Springer, Cham. https://doi.org/10.1007/978-3-319-74847-4_30
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