Hydroxyapatite deposition disease beyond the shoulder: A case series on unusual musculoskeletal locations

Hydroxyapatite deposition disease (HADD) is a condition where calcium hydroxyapatite crystals build up in soft tissues such as tendons and joints, most frequently observed in the shoulder. This specific case series highlights HADD occurrences in atypical locations. This is particularly important because HADD in these unusual areas can easily be mistaken for an infection or a tumor. By improving our awareness that HADD can present in these uncommon sites, clinicians can make a confident diagnosis, leading to better patient care.