Hydroxyapatite deposition disease – Think beyond the shoulder!! A case series with unusual sites of involvement

Abstract

Hydroxyapatite deposition disease (HADD) can affect any location of the body and present with a variety of clinical symptoms. Here, we describe three unusual sites of involvement of HADD around the hip as well as the wrist joint. Magnetic resonance imaging along with computed tomography correlation was performed in these cases, which demonstrated the calcific deposits as well as their associated soft-tissue inflammatory changes. Its imaging findings can look very aggressive and empowering, similar to infection or even malignancy. This makes this entity a great mimicker. Through these cases, we emphasize the need to think about HADD in places other than the classical shoulder girdle and always keep it on the differential list.