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Cystic pilomatrixoma of the wrist mimicking a ganglion cyst in a child

We describe a patient with a cystic pilomatrixoma mimicking a ganglion cyst on ultrasound. A 9‐year‐old boy had a subcutaneous mass on his left wrist. Ultrasound displayed a well‐defined, multilobulated anechoic mass containing a few internal septa between the extensor pollicis longus and the extensor carpi radialis longus tendons. Sonographic findings suggested that the mass was a ganglion cyst. After excisional biopsy, histopathologic examination confirmed the diagnosis of pilomatrixoma. © 2012 Wiley Periodicals, Inc. J Clin Ultrasound, 41:313–315, 2013