Just a painful swelling of the ankles?BMJ 2018; 360 doi: https://doi.org/10.1136/bmj.k436 (Published 09 March 2018) Cite this as: BMJ 2018;360:k436
- Gisela Eugénio, resident in rheumatology1,
- João Tavares, consultant physician in general internal medicine2,
- Mary Marques, resident in rheumatology1,
- Cátia Duarte, consultant physician in rheumatology1,
- J A P da Silva, professor and consultant physician in rheumatology1
- 1Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal
- 2Hospital São Teotónio de Viseu, Viseu, Portugal
- Correspondence to G Eugénio
A 41 year old man presented with a three week history of acute painful swelling of both ankles accompanied by local erythema and heat, morning stiffness of short duration, and fever. During the fourth week, a tender nodular erythematous eruption developed in both legs, suggestive of erythema nodosum. The man had no personal, family, or epidemiological medical history. He reported no previous infections, trauma, or new medications. On physical examination, his temperature was 38.2°C. There was erythema, oedema, pain, and heat in both ankles, with a normal range of movement in the ankle joints, and lesions compatible with erythema nodosum on the anterior aspect of both legs.
Laboratory results showed
Leucocytosis of 14.5×109/L (reference range 4-10) with neutrophilia
Erythrocyte sedimentation rate of 56 mm in first hour (1-20)
C reactive protein 9.53 mg/dl (<0.5)
Normal results on tests of renal, liver, and thyroid function
Normal levels of calcium (serum and urinary); 1,25-dihydroxyvitamin-D, and angiotensin converting enzyme
Negative blood and urine cultures, viral serology (Epstein-Barr, cytomegalovirus, HIV, hepatitis, parvovirus-B19), interferon-gamma-release-assay, and negative autoantibody test results
Chest radiography showed mild bilateral hilar lymphadenopathy (fig 1). A chest computed tomography scan and 18F-FDG-PET/computed tomography scan confirmed symmetrical bilateral hilar lymphadenopathy, with no other findings. Ankle ultrasound showed bilateral peri-articular soft tissue oedema, without synovitis or tenosynovitis.
Bronchoalveolar lavage fluid contained 45% lymphocytes, 11.1 CD4/CD8 cell ratio, and negative bacteriological examination. Bronchial aspiration showed polymorphonuclear cells. Pulmonary function tests were normal.
1. What is the most likely diagnosis?
2. Are …