Tophaceous Pseudogout in the Index Finger

Abstract

A 53-year-old man presented to our hospital reporting having detected a mass in the right index finger. We excised the mass, which appeared to be derived from the volar plate and had chalky white depositions at the cutting surface. Histological observations revealed chondrometaplasia and calcium pyrophosphate dihydrate crystal traces, although crystals were not evident owing to decalcification. It was diagnosed as tophaceous pseudogout, which predominantly occurs in the temporomandibular joint. Occurrence in the fingers is rare. Although some studies reported postexcision recurrence, no obvious signs of recurrence were observed at 2.5 years’ follow-up in the patient in this report. Key words: finger, tophaceous pseudogout