Painless mass in the right upper posterior chest wall for two months.
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There is a small well-defined heterogeneous echogenicity lesion measuring 8 x 13 mm in the superficial subcutaneous soft tissues of right upper posterior chest wall. It has a well-defined hypoechoic rim / capsule. Multiple tiny hyperechoic foci, likely calcifications, are seen in it. There is internal vascularity in the lesion on Doppler ultrasound examination. These ultrasound features are overall suggestive of a benign pathology and possible differential diagnosis includes sebaceous cyst, dermoid cyst, or epidermal inclusion cyst.
This lesion was completely excised and diagnosed as pilomatricoma or calcifying epithelioma of Malherbe on histopathology. No evidence of malignancy was seen.
Pilomatricoma (formerly known as pilomatrixoma or calcifying epithelioma of Malherbe), is a slow growing well-defined benign skin tumor arising from the cortex of a hair follicle. It is commonly seen in patients younger than 20 years 1.
After epidermoid cyst, it is the second most commonly excised pediatric skin mass, accounting for nearly 10% of all superficial masses evaluated by the pathologists 1. Head and neck region (~50% cases), followed by the upper limbs, trunk and the lower limbs are the common sites.
They are usually diagnosed on the basis of clinical history and physical examination findings with imaging being infrequently used in their diagnosis 1. Ultrasound is usually the initial and only imaging modality used in preoperative evaluation of these tumors 1.
These tumors are primarily treated with complete surgical excision 1.