abnormal Langerhans cell morphology abnormal Langerhans cell number MP:0013411 MPheno.ontology anomaly in the number of stellate dendritic cells of myeloid origin, that appear clear on light microscopy and has a dark-staining, indented nucleus and characteristic inclusions (Birbeck granules) in the cytoplasm; Langerhans cells are found principally in the stratum spinosum of the epidermis, but they also occur in other stratified epithelia and have been identified in the lung, lymph nodes, spleen, and thymus