anatomic neck divisions, 1215 f–1219 f axial CTA of, 1218 f clinical assessment, 1220 clinical recognition, 1218 –1219 color flow Doppler (CFD), 1218 computed tomographic angiography (CTA), 1217 contents and structures, 1216 t discharge/admission, clinical indications, 1226 evaluation of, 1224 f, 1225 t evidences, 1215 –1218 history/physical examination, 1226 t management, 1220 –1226 negative predictive value (NPV), 1218 positive predictive value (PPV), 1218 sensory dermatomes, 1222 f–1223 f signs and symptoms of, 1221 t tracheal injury, 1225 f treatment goals, 1214 –1215 triage considerations, 1220 Penetrating thoracic trauma, 1284 Penicillin, 350 , 442 , 512 allergy, 1323 Penile care, in uncircumcised male infant, 1333 –1334 Penile gunshot wounds, 1140 Penile problems, 1333 –1336 balanoposthitis, 1335 –1336 , 1336 f meatal stenosis, 1335 normal uncircumcised male, anatomy of, 1334 f paraphimosis, 1334 –1335 , 1335 f penile care in uncircumcised male infant, 1333 –1334 phimosis, 1334 –1335 post circumcision concerns, 1334 priapism, 1336 Penile trauma, 1140 Penile zipper injury, 1141 , 1141 f Perforated appendicitis clinical assessment, 1293 –1295 clinical recognition, 1293 management, 1295 treatment goals, 1293 Perianal skin tags, 1356 Pericardial disease, 368 Pericardial effusions, 527 Pericardial tamponade, 482 , 1279 –1280 , 1284 Pericardiocentesis, 1280 , 1281 f Pericarditis, 355 , 368 , 502 , 613 Perichondritis, auricular, 1329 –1330 , 1330 f Pericoronitis, 1315 Peridex, oral rinses, 1315 Perihepatitis, 756 Perilaryngeal airways, 41 Perilymphatic fistula, 159 Perineal lesions, 1356 Perineum, for burns, 1101 Perineum trauma, 1141 Periodic fever, aphthous stomatitis, pharyngitis, and cervical adenitis (PFAPA) syndrome, 203 , 312 , 1317 Periodic fever syndrome, 203 Periodic paralysis syndromes, 560 Periodontal ligament (PDL), 1107 Periodontal soft tissue pathology, 1315 –1316 acute necrotizing ulcerative gingivitis (ANUG), 1315 –1316 , 1315 f dental lamina cyst, 1318 f eruption cyst, 1317 , 1317 f eruption hematoma, 1317 f eruption schedule, for teeth, 1315 t gingivostomatitis, crusted extraoral lesions, 1316 f herpes simplex virus type 1, 1316 mucocele, associated with minor salivary gland, 1318 f pericoronitis, 1315 primary herpetic gingivostomatitis, 1316 treatment goals, 1315 trench mouth, 1315 –1316 Periorbital cellulitis See Periorbital/orbital cellulitis Periorbital ecchymosis hemotympanum, 1255 Periorbital/orbital cellulitis, 1395 –1396 clinical assessment, 1395 –1396 clinical recognition, 1395 diagnostic testing, 1396 disposition, 1396 evidences, 1395 management, 1396 treatment goals, 1395 Peripheral giant cell granuloma, 350 Peripheral nerve conduction, 692 Peripheral neuromuscular disorders, 480 –481 Peritonsillar abscess (PTA), 508 –509 , 1323 –1325 , 1325 f Peritonsillar and retropharyngeal abscess, 479 Peritonsillar cellulitis, 1324 –1325 Perthes disease, 306 Pertussis, 102 , 105 , 133 –136 , 501 Pesticides, 1065 Petechiae, 77 , 152 –153 , 198 –199 , 219 , 229 , 233 –234 Peutz–Jeghers syndrome, 219 , 352 , 466 PHACE(S) syndrome, 464 Phalanx injuries, 1146 –1148 Pharmaceutical toxicity acetaminophen, 1041 –1043 , 1043 f antihistamines, 1052 cardiac drugs, 1043 –1048 β-Adrenergic blockers (BBs), 1044 calcium channel blockers (CCBs), 1044 clonidine, 1044 –1045 digoxin, 1045 –1046 iron, 1046 –1048 drugs dangerous in small doses, 1053 , 1054 t, 1055 f isoniazid (INH), 1052 –1053 oral hypoglycemic agents, 1053 psychotropic medications, 1049 monoamine oxidase inhibitors (MAOIs), 1049 phenothiazine antipsychotics, 1049 –1050 selective serotonin reuptake inhibitors (SSRIs), 1049 tricyclic antidepressants, 1048 salicylates, 1050 –1052 Pharyngitis, in immunosuppressed host, 510 Pharyngotonsillitis, 329 Pharynx, 1104 Phencyclidine (PCP), 1069 , 1072 Phenethylamines, 1072 –1073 Phenobarbital, 456 , 497 Phenothiazine antipsychotics, 1049 –1050 Phentolamine, 245 Phenylephrine, 1336 Phenylketonuria, 333 Phenytoin, 456 , 497 , 885 Pheochromocytoma, 667 –668 Phimosis, 1334 –1335 Photophobia, 172 –173 , 188 , 190 Photosensitivity phytophotodermatitis, 436 –437 polymorphous light eruption (PMLE), 435 –436 Phototherapy, 297 –298 , 297 f Phototoxic reaction, 436 Physeal fractures, 1171 –1172 Physical abuse injuries, 620 –624 Physiologic mastalgia, 114 Phytophotodermatitis, 436 –437 , 437 f common plants associated with, 436 t hyperpigmentation due to, 437 f treatment for, 437 type IV hypersensitivity, 436 Pierre Robin syndrome, 380 Pigmentary mosaicism, 465 Pilomatricomas (calcifying epitheliomas), 1353 Pineal tumors, 907 Pinworms (Enterobius vermicularis) , 384 t, 530 Piperacillin, 81 t Pityriasis lichenoides, 472 , 472 f