{Reference Type}: Journal Article
{Title}: Aggressive unifocal bone Langerhans cell histiocytosis with soft tissue extension both responsive to radiotherapy: a case report.
{Author}: Ghuijs W;Kemps PG;Capala ME;Verdijk RM;van Halteren AGS;van der Wal RJP;van Laar JAM;Ghuijs W;Kemps PG;Capala ME;Verdijk RM;van Halteren AGS;van der Wal RJP;van Laar JAM;Ghuijs W;Kemps PG;Capala ME;Verdijk RM;van Halteren AGS;van der Wal RJP;van Laar JAM;
{Journal}: Radiat Oncol
{Volume}: 17
{Issue}: 1
{Year}: Aug 2022 1
{Factor}: 4.309
{DOI}: 10.1186/s13014-022-02108-0
{Abstract}: <B>BACKGROUND: </B>Langerhans cell histiocytosis (LCH) is a rare haematological neoplasm characterized by the accumulation of CD1a+, CD207/Langerin+ histiocytes within inflammatory lesions. LCH can involve any organ, but osteolytic bone lesions are most often encountered. Unifocal bone lesions may regress spontaneously after a thick needle biopsy has been taken.<BR><B>METHODS: </B>In this case report, we describe the initial presentation of a single BRAFV600E mutated osteolytic LCH lesion in the left proximal humerus of a 46-year-old previously healthy woman. Despite multiple surgical interventions, she unexpectedly experienced progressive disease manifestation with significant soft tissue extension to the surrounding musculature, subcutis and epidermis. Because the disease manifestation remained loco-regional, radiotherapy (RT) (total dose of 20 Gy in 10 fractions) was initiated.<BR><B>CONCLUSIONS: </B>The patient achieved a complete remission without any side effects. This case highlights that RT is a rational and relative mild local treatment option for patients with aggressive LCH affecting the bone and surrounding soft tissue.