International Journal of Trichology International Journal of Trichology
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Year : 2017  |  Volume : 9  |  Issue : 4  |  Page : 181-183

Collision tumor between trichofolliculoma and melanocytic nevus

1 Department of Dermatology, Clínica Las Condes, Santiago, Chile
2 Department of Pathology, Clínica Las Condes, Santiago, Chile

Correspondence Address:
Roberto Cullen
Asturias 257, Las Condes, Santiago
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijt.ijt_108_16

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Trichofolliculoma (TF) is a hamartomatous hair follicle-related tumor, clinically described as a dome-shaped papule with a central pore crossed by one or more silky white hairs. Histologically, it described as a cystic cavity containing keratinous debris, hair shaft fragments, and numerous hair follicles arising from its linings. Collision or compound tumors are a coexistence of two or more identifiable tumors in the same lesion. We present a case of a 47-year-old man with a lesion on his left cheek clinically characterized as a TF. However, the histopathological study reveals a collision tumor involving a TF and a melanocytic nevus. Collision tumors involving melanocytic nevi and hair follicle-related tumors have been previously reported, such as desmoplastic trichoepithelioma, epidermoid cyst, folliculosebaceous cystic hamartoma, and trichoadenoma.

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