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Emergency And Acute Medicine – Retropharyngeal Abscess
Retropharyngeal abscess is a deep neck space infection involving the retropharyngeal space, a potential space located between the buccopharyngeal fascia anteriorly and the alar fascia posteriorly, extending from the skull base to approximately the level of T2. Infection may spread through the poorly resistant alar fascia into the “danger space” and descend into the posterior mediastinum, leading to life-threatening complications. It is primarily a pediatric disease, with peak incidence between ages 3 and 5 years when retropharyngeal lymph nodes are most prominent, but cases in adults are increasing. Prognosis is favorable with early recognition, intravenous antibiotics, and surgical drainage when indicated. Airway compromise is the most common and serious complication. Other complications include aspiration pneumonia from rupture, mediastinitis, sepsis, necrotizing fasciitis, internal jugular vein thrombosis (including Lemierre syndrome), carotid artery erosion, epidural abscess, cranial nerve palsies, and recurrent abscess formation.
Most cases arise from spread of infection from the nasopharynx, paranasal sinuses, or middle ear to retropharyngeal lymph nodes. Trauma, foreign bodies, and iatrogenic instrumentation are more common causes in adults. Diabetes and immunosuppression increase risk. The infection is typically polymicrobial, involving aerobic and anaerobic organisms. Common pathogens include Streptococcus pyogenes, viridans streptococci, Staphylococcus aureus (including MRSA), and anaerobes such as Prevotella and Fusobacterium. Less common organisms include Haemophilus species, Klebsiella, Escherichia coli, Mycobacterium tuberculosis, and fungal pathogens.
Presentation may differ between children and adults. Common symptoms include sore throat, neck pain or stiffness, dysphagia, odynophagia, and fever. Patients may also develop stridor, dyspnea, muffled voice, trismus, or drooling. Young children may present only with irritability, poor oral intake, lethargy, or cough. Physical examination in adults may reveal posterior pharyngeal edema, cervical adenopathy, drooling, dysphonia, and tenderness with lateral movement of the larynx (tracheal rock sign). Children often have limited neck extension, torticollis, retropharyngeal bulge, agitation, and signs of respiratory distress.
Airway assessment is the priority. A normal examination does not exclude the diagnosis. Laboratory tests are nonspecific, though leukocytosis is common. Blood cultures should be obtained. Imaging is essential when suspicion is high. Lateral neck radiographs may show widening of the prevertebral soft tissue space, especially if the retropharyngeal space anterior to C2 exceeds 7 mm or is more than twice the vertebral body diameter, or if the space anterior to C6 exceeds 14 mm in preschool children or 22 mm in adults. CT of the neck with intravenous contrast is the preferred imaging modality, showing a hypodense lesion with peripheral ring enhancement. CT assists in determining abscess size and extent but may not reliably distinguish abscess from cellulitis. MRI is more sensitive and useful for evaluating vascular complications such as jugular thrombosis. Imaging should not delay airway management.
The differential diagnosis includes epiglottitis, peritonsillar abscess, croup, tracheitis, meningitis, cervical osteomyelitis, dental infection, mononucleosis, epidural abscess, and other deep neck infections.
Management begins with airway stabilization. The child should be kept in a position of comfort, as forced positioning may worsen obstruction. Supplemental oxygen and close monitoring are required. Early endotracheal intubation or tracheostomy may be necessary in cases of respiratory distress or impending airway obstruction. Induction must be performed cautiously, as sedation may precipitate complete obstruction. Rescue airway equipment must be readily available.
Empiric intravenous antibiotic therapy should begin promptly and cover group A streptococci, Staphylococcus aureus (including MRSA when indicated), and anaerobes. Regimens may include clindamycin, ampicillin-sulbactam, piperacillin-tazobactam, or penicillin plus metronidazole. Vancomycin or linezolid should be added if MRSA is suspected or if there is poor clinical response. Antibiotics should be tailored once culture results are available. The role of corticosteroids remains controversial and should be considered only in consultation with specialists.
All patients require hospital admission for intravenous antibiotics and monitoring. Surgical drainage in the operating room is indicated for airway compromise, large abscesses (typically greater than 2 cm on imaging), failure to improve with antibiotics, or development of complications. Intensive care admission is required for airway compromise, sepsis, hemodynamic instability, altered mental status, or significant comorbidities.
A high index of suspicion is essential, particularly in children presenting with fever, stiff neck, or dysphagia. Early imaging, prompt antibiotic therapy, and early surgical consultation are critical to prevent airway compromise and extension into mediastinal structures.
Retropharyngeal abscess is a deep neck space infection involving the retropharyngeal space, a potential space located between the buccopharyngeal fascia anteriorly and the alar fascia posteriorly, extending from the skull base to approximately the level of T2. Infection may spread through the poorly resistant alar fascia into the “danger space” and descend into the posterior mediastinum, leading to life-threatening complications. It is primarily a pediatric disease, with peak incidence between ages 3 and 5 years when retropharyngeal lymph nodes are most prominent, but cases in adults are increasing. Prognosis is favorable with early recognition, intravenous antibiotics, and surgical drainage when indicated. Airway compromise is the most common and serious complication. Other complications include aspiration pneumonia from rupture, mediastinitis, sepsis, necrotizing fasciitis, internal jugular vein thrombosis (including Lemierre syndrome), carotid artery erosion, epidural abscess, cranial nerve palsies, and recurrent abscess formation.
Most cases arise from spread of infection from the nasopharynx, paranasal sinuses, or middle ear to retropharyngeal lymph nodes. Trauma, foreign bodies, and iatrogenic instrumentation are more common causes in adults. Diabetes and immunosuppression increase risk. The infection is typically polymicrobial, involving aerobic and anaerobic organisms. Common pathogens include Streptococcus pyogenes, viridans streptococci, Staphylococcus aureus (including MRSA), and anaerobes such as Prevotella and Fusobacterium. Less common organisms include Haemophilus species, Klebsiella, Escherichia coli, Mycobacterium tuberculosis, and fungal pathogens.
Presentation may differ between children and adults. Common symptoms include sore throat, neck pain or stiffness, dysphagia, odynophagia, and fever. Patients may also develop stridor, dyspnea, muffled voice, trismus, or drooling. Young children may present only with irritability, poor oral intake, lethargy, or cough. Physical examination in adults may reveal posterior pharyngeal edema, cervical adenopathy, drooling, dysphonia, and tenderness with lateral movement of the larynx (tracheal rock sign). Children often have limited neck extension, torticollis, retropharyngeal bulge, agitation, and signs of respiratory distress.
Airway assessment is the priority. A normal examination does not exclude the diagnosis. Laboratory tests are nonspecific, though leukocytosis is common. Blood cultures should be obtained. Imaging is essential when suspicion is high. Lateral neck radiographs may show widening of the prevertebral soft tissue space, especially if the retropharyngeal space anterior to C2 exceeds 7 mm or is more than twice the vertebral body diameter, or if the space anterior to C6 exceeds 14 mm in preschool children or 22 mm in adults. CT of the neck with intravenous contrast is the preferred imaging modality, showing a hypodense lesion with peripheral ring enhancement. CT assists in determining abscess size and extent but may not reliably distinguish abscess from cellulitis. MRI is more sensitive and useful for evaluating vascular complications such as jugular thrombosis. Imaging should not delay airway management.
The differential diagnosis includes epiglottitis, peritonsillar abscess, croup, tracheitis, meningitis, cervical osteomyelitis, dental infection, mononucleosis, epidural abscess, and other deep neck infections.
Management begins with airway stabilization. The child should be kept in a position of comfort, as forced positioning may worsen obstruction. Supplemental oxygen and close monitoring are required. Early endotracheal intubation or tracheostomy may be necessary in cases of respiratory distress or impending airway obstruction. Induction must be performed cautiously, as sedation may precipitate complete obstruction. Rescue airway equipment must be readily available.
Empiric intravenous antibiotic therapy should begin promptly and cover group A streptococci, Staphylococcus aureus (including MRSA when indicated), and anaerobes. Regimens may include clindamycin, ampicillin-sulbactam, piperacillin-tazobactam, or penicillin plus metronidazole. Vancomycin or linezolid should be added if MRSA is suspected or if there is poor clinical response. Antibiotics should be tailored once culture results are available. The role of corticosteroids remains controversial and should be considered only in consultation with specialists.
All patients require hospital admission for intravenous antibiotics and monitoring. Surgical drainage in the operating room is indicated for airway compromise, large abscesses (typically greater than 2 cm on imaging), failure to improve with antibiotics, or development of complications. Intensive care admission is required for airway compromise, sepsis, hemodynamic instability, altered mental status, or significant comorbidities.
A high index of suspicion is essential, particularly in children presenting with fever, stiff neck, or dysphagia. Early imaging, prompt antibiotic therapy, and early surgical consultation are critical to prevent airway compromise and extension into mediastinal structures.
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