[Tumors of unknown origin: Case report].

IgG4 related disease is a recently recognized chronic fibrotic, inflammatory condition, caused by infiltrating IgG4 positive plasma cells that can cause tumor like disease in almost any organ in the body. Typical histopathology is lymphoplasmocytic infiltration of IgG4 positive cells, storiform fibrosis and obliterative phlebitis. Glucocorticoids alone or in combination with B-cell depletion with rituximab causes often good, lasting response.

[A 78 year-old man with hyponatremia, malaise and weight loss caused by a pituitary mass].

A 78 year-old male was admitted for rehabilitation after a trans-tibial amputation three months earlier. Scheduled training with a prosthetic leg was postponed due to muscle atrophy and weakness. As the patient's status deteriorated, blood results showed worsening hyponatremia.