[A case of aggressive systemic mastocytosis].

The study presents a case of systemic mastocytosis, discovered in 64 years old male, after two years of persistent fever and chest pain with dyspnea. The authors describe differential diagnostics including imaging and laboratory procedures. Presented material contains pictures of histopathological sections and biopsies. Attention was drawn to the importance of histopathology and immunohistochemical assays in differential diagnostics of uncertain cases.