Malignant Pilomatricoma: A Report of Two Cases and Review of Literature

Giant pilomatrix carcinoma of the scalp with intracranial extension: A case report

Key Clinical Message

A very rare skin cancer. Malignant variant of pilomatricoma. It is unique because of its highly aggressive behavior. Responds poorly to chemotherapy and radiotherapy. Treated with a wide surgical excision with safe margins.

Abstract

Pilomatrix carcinoma is uncommon and locally aggressive tumor of the hair follicle matrix. It is a malignant variant of pilomatricoma. If left untreated for a long time may attain massive size and has the potential for distant spread. Only few cases with brain extension have been reported in the literature. Diagnosis of these tumors is established by histopathology. Although pilomatrixoma and pilomatrix carcinoma are well-recognized lesions, clinically they are frequently misdiagnosed as other skin conditions. The tumors respond poorly to chemotherapy and radiotherapy. Thus, recommended treatment is a wide surgical excision with safe margins. Herein, we report the case of a 39-year-old African woman with pilomatrix carcinoma of the scalp eroding the skull bone with intracranial extension.

Multiple giant pilomatricomas of the scrotal: A rare case report from Syria

Pilomatrixoma, also known as calcifying epithelioma of Malherbe, is a cutaneous tumor originating from the hair matrix that commonly affects children. Pilomatrixoma is usually solitary and most commonly found on the face, neck, and upper torso, while the scrotum is considered a very rare site. We report a rare location and manifestation of pilomatrixoma as multiple, large, firm, calcified scrotal masses in a 32-years old man. An excisional biopsy was performed, and the diagnosis was confirmed.

A rapidly growing pedunculated pilomatrixoma of the eyelid

A pilomatrixoma is a benign tumor originating from a hair follicle that most frequently occurs in the head-and-neck region. It usually presents as a subcutaneous, slow-growing, nodular, painless firm mass. There are few reported cases on eyelid pilomatrixoma. We reporting an unusual presentation of a rapidly growing pedunculated eyelid pilomatrixoma in a 29-year-old female patient. Surgical excision was performed, and histological examination showed a cavity containing proliferating cords of basaloid cells differentiated into eosinophilic keratinized shadow cells confirming the pilomatrixoma diagnosis. Only a few cases with pedunculated eyelid masses have been reported in the literature; pedunculated lesions can be misdiagnosed as vascular tumors or malignancies. Therefore, pilomatrixoma should be considered in the differential diagnosis of such a presentation. A complete excisional biopsy of the mass is diagnostic and therapeutic.

Malignant Pilomatricoma of the Lower Extremity: A Difficult and Rare Diagnosis

Malignant pilomatricoma is a rare cutaneous malignancy that is commonly found on the head and neck. We present a patient with malignant pilomatricoma of the lower extremity with intralesional calcification and giant cells, confirmed by histopathology. This patient’s case represents a clinically important variation of malignant pilomatricoma in an uncommon anatomical location.