<unk>  on the person's right as seen on CT imaging Diagnosis is usually based on the symptoms. Medical imaging may be done to rule out complications. Medical imaging may include CT scan, MRI, or ultrasound is also useful in diagnosis.
Peritonsillar abscess
Epiglottitis
Retropharyngeal abscess
Infectious mononucleosis
Parapharyngeal abscess
Adenoiditis
Streptococcal pharyngitis
Tonsillitis