Lethargy, 117 Leukemia, 318 , 901 –906 clinical assessment, 902 , 905 clinical recognition, 902 evidences, 902 goals of treatment, 901 management, 905 –906 Leukopenia, 997 Levetiracetam, 497 Leydig cell atrophy, 257 Lichen nitidus, 469 t, 473 , 473 f Lichen planus, 469 t, 473 , 473 f, 649 –650 Lichen sclerosis, 384 t, 534 , 544 , 763 –764 Lichen simplex chronicus, 433 Lichen striatus, 469 t, 473 –474 , 473 f Lidocaine, 40 , 56 t, 1316 increased intracranial pressure, 1256 Life after Pediatric Sepsis Evaluation (LAPSE) study, 85 Life-threatening lymphadenopathy, 314 –315 Ligamentous injuries, 1201 –1202 Limb lymphatic malformations, 1352 Limp algorithmic approach to, 304 f with bilateral leg pain, 304 causes, 301 definition, 301 differential diagnosis, 301 –305 by age and location of pathology, 303 t by disease category, 302 t evaluation and decision history, 305 laboratory and imaging studies, 305 –306 physical examination, 305 localized findings without pain, 302 with migratory bone pain, 304 rheumatic conditions and, 302 with testicular pain, 305