Author: Adjunct A/Prof Patrick Emanuel, Dermatopathologist, Clinica Ricardo Palma, Lima, Peru. DermNet NZ Editor-in-chief: Adjunct A/Prof Amanda Oakley. August 2018. 


Intralymphatic histiocytosis pathology — codes and concepts
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Introduction

Intralymphatic histiocytosis manifests as quite non-descript erythematous patches or plaquesAutoimmune disease (eg, rheumatoid arthritis), joint replacements, and malignancyrosacea appear to be aetiologic factors.

Histology of intralymphatic histiocytosis

In intralymphatic histiocytosis, the histopathology shows dilated lymphatic spaces stuffed with histiocytes and associated lymphocytes (figures 1,2,3). There is often oedema of the surrounding dermis. The overlying epidermis is uninvolved. In cases occurring around the eyes, it is common to find Demodex species in follicular structures (figure 4).

Intralymphatic histiocytosis pathology

Special studies for intralymphatic histiocytosis

Immunohistochemical studies for lymphatics (eg, D2–40) highlight the lymphatic structures. Histiocyte markers (eg, CD68, CD143) highlight the histiocytes.

The differential diagnosis for intralymphatic histiocytosis 

  • Malignancy — intravascular carcinoma or melanoma needs to be excluded. Carcinoma or melanoma will generally stain positively with cytokeratins and melanocytic markers (eg, Sox-10) respectively  
  • Melkersson–Rosenthal syndrome — this disease often shows intralymphatic histiocytes but also shows extravascular granulomas.

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Related information

 

References

  • Emanuel PO, Lewis I, Gaskin B, Rosser P, Angelo N. Periocular intralymphatic histiocytosis or localized Melkersson-Rosenthal syndrome? J Cutan Pathol. 2015 Apr;42(4):289-94. doi: 10.1111/cup.12419. Epub 2015 Feb 3. PubMed PMID: 25370527. Journal.

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