Malignant Melanocytic Trichoblastoma

Abstract

Trichoblastoma is an uncommon benign cutaneous neoplasm of the hair germ cell. The pigmented variety of the tumor is rare. There have only been a few case reports describing the malignant counterpart of trichoblastoma. There are no reports describing a pigmented variety of malignant trichoblastoma. We are presenting a case report of a 47-year-old patient with malignant trichoblastoma containing melanin deposits and propose to define this variety of the tumor as a separate entity: malignant melanocytic trichoblastoma.

Clinicopathological features of trichoblastomas and malignant variant: trichoblastic carcinoma

“…Malignant trichoblastoma has only been described in case reports in the literature. Pigmented forms such as trichoblastomas and giant forms have also been reported [14,15]. As in our patients, these lesions mostly affect the head and neck region [16] and the elderly, although, other locations such as the abdomen [17] and the paraspinal area [18] may also be involved.…”

A clinically challenging pigmented lesion on the scalp

“…4 This malignant lesion had grown in size over a 1-year period and was described as irritated but not painful. 4 The clinical features of pigmented trichoblastomas are variable. However, most lesions reported are > 20 mm in diameter, and they may be nodular or plaque-like.…”

“…Pigmented trichoblastomas are rare, with < 10 reported cases in the literature. These tumours are usually benign; however, one case of a malignant pigmented trichoblastoma has recently been reported 4 . This malignant lesion had grown in size over a 1‐year period and was described as irritated but not painful 4 …”

Pigmented Trichoblastoma

“…Trikoblastom genel olarak selim kabul edilen bir tümör olmakla birlikte, az sayıda olguda invaziv büyüme veya habis dönüşüm bildirilmiş olduğundan yakın izlem veya tümörün total eksizyonu önerilmektedir (10,11). Tümörün sistemik bir hastalık ile ilişkisi bilinmediğinden hastamızda başka bir incelemeye gerek görülmemiştir.…”