Felty's syndrome 4/5 (3)

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Felty's syndrome

Felty's syndrome. MRI images show large spleen (splenomegaly). Radiol Res Pract. 2013; Palas J1, Matos AP1, Ramalho M1. Open

Feltys Syndrome ICD-10: M05.0


Felty's syndrome is a complication of arthritis (rheumatoid arthritis, RA) where extra-articular organs are attacked. The disease was first described by Felty in 1924 and has many common features LGL leukemia.

  • The syndrome is characterized by low white blood cell count (leukopenia og neutropenia) and enlarged spleen (splenomegaly).


Felty's syndrome occurs in 1-2% of those with rheumatoid arthritis (RA).


Severe, «seropositive» RA

Medical investigations

  • Spleen: Moderately enlarged (over 12 cm by ultrasound examination / CT / MR)
  • Blood: Low white blood cell count (leukopenia og neutropenia)
    • neutropenia; Moderate (0,5-1,0) - severe (below 0,5)
  • Splenomegaly enlarged spleen
  • Almost everyone is RF and CCP (ACPA) positive in blood tests


Infections occur due to low numbers neutrophil white blood cells (neutropenia)


Disease-reducing drugs for active rheumatoid arthritis (RA).

  • Neupogen (filgrastim) is used to increase the number of neutrophils (reference: Lazaro E 2015)
  • Splenectomy (surgical removal of the spleen) was previously standard treatment, but is rarely done now

Medical Prognosis / Life expectancy

Previously, the disease has had high mortality (25% over 5 years), but the prognosis has improved with newer treatment methods.

Incorrect diagnosis? (Similar diseases / differential diagnoses)


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