solar elastosis

Solar elastotic material in dermal lymphatics and lymph nodes

The movement of material via passive mechanical transport through lymphatic channels (also known as "benign mechanical transport") is a physiologic mechanism invoked to explain the occasional presence of benign heterotopic tissues within lymph nodes.

However, historically, the concept of benign mechanical transport has provoked controversy. The proof of this concept is of fundamental importance to the claim that foreign cells or cellular aggregates found within a sentinel lymph node do not necessarily represent clinically relevant metastatic disease.

Solar elastotic material can be found in lymph nodes in association with metastatic melanoma, nodal melanocytic nevi, and in otherwise unremarkable lymph nodes lacking extrinsic cells.

These findings support the concept of the mechanical transport of both benign and malignant tissues through lymphatics and document that passively transported material can appear in any compartment of the lymph node.

An important concept to give evidence for, as it offers a sound explanation for the presence of some cellular deposits within lymphoid tissue and supports the assertion that some of these deposits are benign.

References

 Solar elastotic material in dermal lymphatics and lymph nodes. Pulitzer MP, Gerami P, Busam K. Am J Surg Pathol. 2010 Oct;34(10):1492-7. PMID: 20829679