Grand Rounds

Department of Pediatrics, Ready Children’s Hospital, San Diego, USA

Address for Correspondence: Dr Stacey Ulrich, Department of Pediatrics, Ready Children’s Hospital, San Diego 3020 Children’s Way, MC 5075, San Diego, CA 92123. Email:

Keywords: Mixed connective tissue disorder, MCTD

Clinical Problem :
What is the likely diagnosis?

What is the likely diagnosis?

Discussion :
Mixed connective tissue disorder (MCTD) given her elevated RNP and heterogeneous symptom presentation. MCTD has overlapping manifestations of systemic lupus erythematosus (SLE), systemic sclerosis, inflammatory myositis, and arthritis, in addition to high autoantibodies to RNP.1 Some rheumatologists view MCTD as an undifferentiated connective tissue disease or overlap syndrome, while others classify it as a separate disease.2 The pediatric median age of onset is 11 years (range from 2-16 years).3 About 80% of patients are female, and many will evolve into systemic sclerosis or lupus as they get older.4 There are different classifications for MCTD, and the Alarcon-Segovia criteria are one of the easiest to apply in the clinical setting.5 These classification criteria have been evaluated for adults but not pediatric MCTD and are usually used not for diagnostic purposes, rather for research and tracking. One common requirement in all criteria is high titer anti-RNP antibodies.6 Other rheumatic diseases can have high anti-RNP antibodies and in SLE it can be a marker for more severe disease. Anti-RNP is detectable in 25-47% of SLE patients usually in conjunction with anti-Smith antibodies, but high titers of isolated anti-RNP antibodies are diagnostic of MCTD.4,7

Most common findings in MCTD include Raynaud’s phenomenon, swollen hands, arthritis, sicca complaints, and esophageal disease. Raynaud’s phenomenon may present years before other findings, and any pre-pubertal child who develops this should be assessed for rheumatologic disease.4 Other manifestations are lupus-like and or scleroderma skin changes, myositis, serositis, and lung disease. Our patient had a primary facial and truncal rash, facial swelling, and back pain. She also had oral ulcers that are not included in MCTD criteria but demonstrate potential overlap features with SLE. Case reports have described patients presenting with oral ulcers at the time of MCTD diagnosis.8,9 Prior treatment with corticosteroids may have also altered her symptoms and presentation.

MCTD can be one of the milder rheumatic diseases but the prognosis is primarily dependent on the predominating disease entity it may follow. Of those with more systemic sclerosis or SLE pattern, one third can develop serious lung disease. Pulmonary dysfunction may be underestimated in pediatric patients due to insidious onset.10 Treatment for MCTD is targeted for organ involvement. Vasodilators can be used for Raynaud’s phenomenon, proton pump inhibitors for gastroesophageal reflux, and topical steroids for inflammatory rashes. NSAIDs or antimalarials are recommended for mild disease while corticosteroids and other Immunosuppressants may be required for moderate to severe disease.4

While rheumatologic disorders are not very common in the pediatric population, they should be considered when the presenting symptoms are prolonged for typical viral illnesses or laboratory studies are concerning for an inflammatory process. The persistently elevated anti-RNP antibodies and her improvement with steroids ultimately led to her diagnosis of MCTD.

References :
  1. Sharp GC, Irvin WS, Tan EM, Gould RG, Holman HR. Mixed connective tissue disease: an apparently distinct rheumatic disease syndrome associated with a specific antibody to an extractable nuclear antigen (ENA). Am J Med. 1972; 52:148-159.
  2. Cappelli S, Bellando Randone S, Martinovic D, Tamas MM, Pasalic K, Allanore Y, et al. "To be or not to be." ten years after: evidence for mixed connective tissue disease as distinct entities. Semin Arthritis Rheum. 2012;41:589-598.
  3. Burdt MA, Hoffman RW, Deutscher SL, Wang GS, Johnson JC, Sharp GC. Long-term outcome in mixed connective tissue disease: longitudinal clinical and serologic findings. Arthritis Rheum 1999;42:899-909.
  4. Nevares A. Mixed Connective Tissue Disease. In: Porter R, et al. The Merck Manual of Diagnosis and Therapy. Whitehouse, NJ: Merck Sharp & Dohme Corp. Available at URL: Accessed February 28, 2019.
  5. Amigues JM, Cantagrel A, Abbal M, Mazieres B. Comparative study of 4 diagnosis criteria sets for mixed connective tissue disease in patients with anti-RNP antibodies. Autoimmunity Group of the Hospitals of Toulouse. J Rheumatol. 1996;23:2055-62.
  6. Berard R, Laxer M. Pediatric Mixed Connective Tissue Disease. Rheumatol Rep. 2016;18:28.
  7. Migliorini P, Baldini C, Rocchi V, Bombardieri S. Anti-Sm and anti-RNP antibodies. Autoimmunity 2005;38:47-54.
  8. Faden A, Aljamili A, Aljamili A, Alahmari S, Asiri A. Mixed connective tissue disease in young Saudi patient with recurrent dental abscess: A case report Int J Health Sci (Qassim). 2018;12:65-68.
  9. S L, Tony K, Raghupathy, V S, Malepati B. A Rare Case of Mixed Connective Tissue Disease (MCTD) with Intricate Features of Lupus, Polymyositis and Rheumatoid Arthritis Presenting with Severe Myositis. J Clin Diagn Res. 2015;9:OD05-7.
  10. Pepmueller P, Lindsley C. Mixed Connective Tissue Disease and Undifferentiated Connective Tissue Disease. In: Petty R, Laxter R, Lindsey C, Wedderburn L. Textbook of pediatric rheumatology. Philadelphia: Elsevier, 2016;29:418-426.

Correct Answers :  yes 100%
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