Langerhans cell sarcoma is a form of malignant histiocytosis. It should not be confused with Langerhans cell histiocytosis which is cytologically benign. Langerhans cell sarcoma is known to transform into leukemia. It can present in the lung but such cases are rare.
This page contains content from the copyrighted Wikipedia article "Langerhans cell sarcoma"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.