This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CSOM and its Complications, Subject name: ENT
[{'content': "One of the following abscesses occur in sternocleidomastoid sheath in relation to mastoid infections: \nSelect and explain. \nA. Bezold's abscess, B. Meatal abscess, C. Luc's abscess, D. Citelli's abscess", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans: A (Bezold's abscess) Ref: Diseases of the Ear Nose and Throat by PL Dhingra 5th edn ,2010.pg 87Explanation:Bezold's abscessIt is an extra cranial complication of CSOM - attico antral typePus breaks through the mastoid tip and extends along the sternocleidomastoid to present as a neck abscessOther abscess arePost aural abscess:Most commonDisplaces the pinna forwards, outwards and downwardsMeatal abscess:Luc's abscessPus breaks into the bony osseous external auditory meatus.Citelle's abscess:Pus tracks along the digastric muscle and presents in the digastric triangle.Zygomatic abscess:Presents at the root of zygoma.Swelling seen in front and above the pinna.", 'role': 'assistant'}]