title: [A man with an abnormality of the upper arm on an X-ray of the chest].
abstract: A 82-year-old man was referred to our hospital because of a history of falling. Routine radiography of the chest accidentally showed an abnormality of the left upper arm. The x-ray showed calcifications - rings and arcs - also known as popcorn calcifications. This is a typical radiological sign which may indicate a tumour of the condroid matrix.
authors.affiliation: Slotervaartziekenhuis, Amsterdam.
authors.forename: Floor J A
authors.initials: FJ
authors.lastname: van Deudekom
authors.forename: Ingeborg M J A
authors.initials: IM
authors.lastname: Kuper
authors.forename: Maureen  E
authors.initials: M
authors.lastname: Groote
mesh_terms: D000058:Accidental Falls; D000369:Aged, 80 and over; D001132:Arm / Q000000981:diagnostic imaging*; D002114:Calcinosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D013902:Radiography, Thoracic