Tumoral calcinosis of the foot: An unusual differential diagnosis of calcaneal mass

•We describe an unusual case of primary tumoral calcinosis of the foot in a 76-year-old female.•We discuss the pathophysiology, diagnosis and therapeutic interventions of tumoral calcinosis.•Tumoral calcinosis should be considered in the differential diagnosis of any soft tissue calcification.

IntroductionTumoral calcinosis (TC) is a rare disorder characterized by the development of calcified masses within the periarticular soft tissues of large joints. It commonly involves the hip, shoulders, and elbows. TC rarely involves the feet.Case presentationIn this report, we describe an unusual case of primary TC of the foot in a 76-year-old female and discuss the pathophysiology, diagnosis, and therapeutic interventions of the condition.DiscussionDue to the wide range of conditions mimicking TC, its diagnosis could be challenging. Diagnosis of TC is mainly based on the radiographic findings, the patient’s biochemical profile, and the medical history plus differentiating the condition from its mimics.ConclusionTC should be considered in the differential diagnosis of any soft tissue calcification.