Skin biopsy from a patient with mycosis fungoides, showing a large cluster of atypical lymphocytes in the epidermis (Pautrier microabscess, arrow).
From Warnke, RA, Weiss, LM, Chan, JK, Cleary, ML, Dorfman, RF. Tumors of the lymph nodes and spleen. Atlas of tumor pathology (electronic fascicle), Third series, fascicle 14, 1995, Washington, DC. Armed Forces Institute of Pathology.