Pharyngitis differential diagnosis

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Overview

Pharyngitis should be differentiated from other infectious causes which mimic sore throat that includes oral thrush, infectious mononucleosis, epiglottitis and retropharyngeal abscess.[1]

Differentiating Pharyngitis from other Diseases

The major goal of the differentiating patients with sore throat or acute pharyngitis is to exclude potentially dangerous causes (e.g. Group A streptococcus), to identify any treatable causes, and to improve symptoms. Identifying the treatable causes is important because timely treatment with antibiotics helps prevent complications such as acute rheumatic fever, post streptococcal glomerulonephritis.[2]

Variable Pharyngitis Oral thrush Mononucleosis Epiglottitis Tonsilitis Retropharyngeal abscess
Presentation Dysphagia without odynophagia which will differentiate it from pharyngitis. Usually presents with a classic triad of Usually present with stridor and drooling; and other symptoms include difficulty breathingfever, chills, difficulty swallowinghoarseness of voice Sore throat, pain on swallowing, feverheadachecough Neck painstiff necktorticollis

fevermalaisestridor, and barking cough

Causes Group A beta-hemolytic streptococcus. candidal infection Epstein-Barr virus H. influenza type b, beta-hemolytic streptococciStaphylococcus aureus, fungi and viruses. Most common cause is viral including adenovirusrhinovirusinfluenzacoronavirus, and respiratory syncytial virus. Second most common causes are bacterial; Group A streptococcal bacteria,[5]  Polymicrobial infection. Mostly; Streptococcus pyogenesStaphylococcus aureus and respiratory anaerobes (e.g. FusobacteriaPrevotella, and Veillonella species)[3][4][5][6][7][8]
Physical exams findings Inflammed pharynx with or without exudate White plaques that reveal an erythematous base when scraped Diffuse lymphadenopathy, particularly bilateral and posterior cervical,Splenomegaly in 50% of cases, Hepatomegaly in 10% of cases, Pharyngeal petechiae, Rash in 90% of patients will develop a pruritic, maculopapular rash after the use of ampicillin or amoxicillin CyanosisCervicallymphadenopathy, Inflammed epiglottis Fever, especially 100°F or higher.Erythemaedema and Exudate of the tonsils.cervical lymphadenopathyDysphonia.[9][10][11][12] Child may be unable to open the mouth widely. May have enlarged

cervical lymph nodes and neck mass.

Age commonly affected Mostly in children and young adults,

with 50% of cases identified

between the ages of 5 to 24 years.[13]

Usually in immunocompromised patients, including those with advanced HIV/AIDS Common in adolescents between 15-25 Used to be mostly found in

pediatric age group between 3 to 5 years,

however, recent trend favors adults

as most commonly affected individuals with a mean age of 44.94 years.[14]

Primarily affects children

between 5 and 15 years old.[15]

Mostly between 2-4 years, but can occur in other age groups.[16][17]
Imaging finding Thumbprint sign on neck x-ray Intraoral or transcutaneous USG may show an abscess making CT scan unnecessary.[18][19][20] On CT scan, a mass impinging on the posterior pharyngeal wall with rim enhancement is seen.[21][22]
Treatment Antimicrobial therapy mainly penicillin-based and analgesics. oral fluconazole Supportive therapy

Glucocorticoids may be indicated in such cases of severe airway obstruction.

Airway maintenance, parenteral Cefotaxime or Ceftriaxone in combination with Vancomycin. Adjuvant therapy includes corticosteroids and racemic Epinephrine.[23][24] Antimicrobial therapy mainly penicillin-based and analgesics with tonsilectomy in selected cases. Immediate surgical drainage and antimicrobial therapy. emperic therapy involves; ampicillin-sulbactam or clindamycin.



Variable Croup Epiglottitis Pharyngitis Bacterial tracheitis Tonsilitis Retropharyngeal abscess Subglottic stenosis
Presentation Cough Sore throat, pain on swallowing, fever, headache, abdominal pain, nausea and vomiting Barking cough, stridor,

fever, chest pain,

ear pain, difficulty breathing, headache, dizziness.

Sore throat, pain on swallowing, fever, headache, cough Neck pain, stiff neck, torticollis

fever, malaise, stridor, and barking cough

Depends on severity. May have respiratory distress at birth, exercise-induced dyspnea, intermittent wheezing. Inspiratory stridor. [25]
Stridor
Drooling
Others are Hoarseness, Difficulty breathing, symptoms of the common cold, Runny nose, Fever Other symptoms include difficulty breathing, fever, chills, difficulty swallowing, hoarseness of voice
Causes Parainfluenza virus H. influenza type b, beta-hemolytic streptococci, Staphylococcus aureus, fungi and viruses. Group A beta-hemolytic streptococcus. Staphylococcus aureus Most common cause is viral including adenovirus, rhinovirus, influenza, coronavirus, and respiratory syncytial virus. Second most common causes are bacterial; Group A streptococcal bacteria,[26]  Polymicrobial infection. Mostly; Streptococcus pyogenes, Staphylococcus aureus and respiratory anaerobes (example; Fusobacteria, Prevotella, and Veillonella species)[3][4][5][6][7][8] Congenital, trauma
Physical exams findings Suprasternal and intercostal indrawing,[27] Inspiratory stridor[28], expiratory wheezing,[28] Sternal wall retractions[29] Cyanosis, Cervical lymphadenopathy, Inflammed epiglottis Inflammed pharynx with or without exudate Subglottic narrowing with purulent secretions in the trachea[30][31] Fever, especially 100°F or higher.[9][10]Erythema, edema and Exudate of the tonsils.[11] cervical lymphadenopathy, Dysphonia.[12] Child may be unable to open the mouth widely. May have enlarged

cervical lymph nodes and neck mass.

Signs of respiratory distress, intermittent wheezing. Inspiratory stridor. [25]
Age commonly affected Mainly 6 months and 3 years old

rarely, adolescents and adults[32]

Used to be mostly found in

pediatric age group between 3 to 5 years,

however, recent trend favors adults

as most commonly affected individuals[14]

with a mean age of 44.94 years.

Mostly in children and young adults,

with 50% of cases identified

between the ages of 5 to 24 years.[33]

Mostly during the first six years of life Primarily affects children

between 5 and 15 years old.[15]

Mostly between 2-4 years, but can occur in other age groups.[16][17] May be congenital congenital or acquired. Mean age in acquired is 54.1 years[34]
Imaging finding Steeple sign on neck X-ray Thumbprint sign on neck x-ray Lateral neck xray shows intraluminal membranes and tracheal wall irregularity. Intraoral or transcutaneous USG may show an abscess making CT scan unnecessary.[18][19][20] On CT scan, a mass impinging on the posterior pharyngeal wall with rim enhancement is seen[21][22] Bronchoscopy reveals subglottic stenosis. Computed tomography may reveal a concentric stenotic tracheal segment.[35]
Treatment Dexamethasone and nebulised epinephrine Airway maintenance, parenteral Cefotaxime or Ceftriaxone in combination with Vancomycin. Adjuvant therapy includes corticosteroids and racemic Epinephrine.[23][24] Antimicrobial therapy mainly penicillin-based and analgesics. Airway maintenance and antibiotics Antimicrobial therapy mainly penicillin-based and analgesics with tonsilectomy in selected cases. Immediate surgical drainage and antimicrobial therapy. emperic therapy involves; ampicillin-sulbactam or clindamycin. Endoscopic balloon dilation for patients with low-grade subglottic stenosis,[36] glucocorticoid injections, and resection.[37]

References

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