Calcifying epithelioma of malherbe (Pilomatrixoma): Clinical and sonographic features

Abstract

PurposeThe purpose of this study was to describe the clinical and sonographic features of calcifying epitheliomas (pilomatrixomas).MethodsWe retrospectively reviewed the clinical data and sonographic appearances of 59 cases of calcifying epitheliomas in 58 patients that were confirmed pathologically.ResultsThe mean age of the patients was 26 years (range, 5–69 years) and the female‐to‐male ratio was 1.2. All masses were located in subcutaneous soft tissues. Overall, 76.3% of the cases were located in the head and neck; the mean tumor size was 13 mm, and 72.9% of the cases were between 10 and 20 mm in size. Of the lesions, 62.7% were hypoechoic masses with internal calcifications, and 74.6% of them showed low or moderate internal vascularity on Doppler imaging.ConclusionsThe diagnosis of calcifying epithelioma should be considered in a patient with a painless, circumscribed, oval‐shaped hypoechoic mass with internal calcifications and internal vascularity in the subcutaneous soft tissues of the head or neck. The mass may be small and have well‐defined margins, with hypoechogenicity. © 2017 Wiley Periodicals, Inc. J Clin Ultrasound 46:3–7, 2018;

Trichilemmal Cyst: Clinical and Sonographic Features

“…Moreover, they are characteristically situated entirely in the subcutaneous fat layer, whereas TCs are located in subcutaneous soft tissues close to the dermis. The characteristic sonographic features of pilomatricoma also differ from TCs in that they are typically well‐defined solid calcified masses with moderate intrinsic vascularity and a peripheral hypoechoic rim corresponding to the connective tissue capsule . Most TCs are hypoechoic masses containing calcifications with posterior sound enhancement but no color Doppler signals …”

Pilomatrixoma of the Neck/Shoulder Region Mimicking a Rapidly Growing Neoplasm of Peripheral Nerve Sheath Origin in Neurofibromatosis Type 1

“…Lin et al revealed predominant hypoechoic lesions on ultrasound images of pilomatrixoma. The tumor may show ossifications that can be detected in ultrasound (19). In the present case, the tumor was of dense internal hyperechoic signals and showed a distinct border.…”

“…Ultrasound examination is very suitable for the initial examination of this skin tumor (19). Lin et al revealed predominant hypoechoic lesions on ultrasound images of pilomatrixoma.…”

Ultrasound Morphologic Features of Steatocystoma Multiplex With Clinical Correlation

“…On color Doppler imaging, pilomatrixomas can show a variable degree of vascularity both in the periphery and internally. 15 In our SCM series, the hypervascularity only showed a perilesional pattern. 17 Interestingly, HS was identified as an associated lesion in 33% of cases (3 of 9).…”

“…This benign tumor appears on US imaging as a well-defined dermal and subcutaneous nodule. 15 Its most common form of presentation is the target type, with a hypoechoic rim and a hyperechoic center that contains a variable amount of hyperechoic spots that correspond to calcium deposits, which may show different intensities of a posterior acoustic shadowing artifact. 16 In SCM, no internal calcium deposits were observed in our cases or reported in the literature.…”