Hahn Elina, Khalili Iman, Krenn Veit, Rüther Wolfgang, Niemeier Andreas
Klinik für Orthopädie und Unfallchirurgie, Zentrum für Operative Rheumatologie, Krankenhaus Reinbek St. Adolfstift, Hamburger Str. 41, 21465, Reinbek, Deutschland.
MVZ für Histologie, Zytologie und molekulare Diagnostik Trier, Trier, Deutschland.
Z Rheumatol. 2025 Sep;84(7):557-560. doi: 10.1007/s00393-025-01659-3. Epub 2025 May 26.
An 81-year-old man presented with progressive tumorous swelling of the infrapatellar region of the left knee joint. X‑ray imaging was suggestive of bursosynovial chondromatosis or ectopic calcification. Histopathological examination of the resected tissue combined with laboratory findings of renal insufficiency and secondary hyperparathyroidism led to the diagnosis of tumoral calcinosis, which is a rare subentity of ectopic calcification.