This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'True about epidermoid cysta) Punctum is presentb) Keratin is presentc) Sebaceous material presentd) Autosomal inheritancee) May turn malignant \nSelect and explain. \nA. abc, B. bcd, C. abe, D. acd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Epidermoid cyst (also k/a sebaceous cyst, epidermal cyst) Epidermoid cysts are most common cutaneous cysts.\n\nEpidermoid cyst results from proliferation of epidermal cells within a circumscribed space of dennis (which had got implanted within the dermis due to a variety of reasons)\nSebaceous cyst is a misnomer as the cysts are not of sebaceous origin and the white, creamy material filled within them is not sebum but is keratin (desquamated epithelial cells)\nThe walls of these cysts consist of a layer of epidermis oriented with the basal layer superficial and the more mature layers deep (i.e. the epidermis grows into the centre of the cyst). The desquamated cells (keratin) collect in the centre and form the creamy substance of the cyst.\nEpidermoid cysts usually are asymptomatic unless they get infected or inflamed and become painful\nThey appear as firm, round, flesh coloured to yellow or white subcutaneous nodules of variable size. A central pore or punctum is an inconsistent finding that may tether the cyst to the overlying epidermis and from which the white creamy material can be expressed.\nRarely malignancies (basal cell carcinoma, squamous cell ca) can develop in epidermoid cysts.\n\n\nTreatment\n\nincision and drainage is recommended for an acutely infected cyst.\nafter resolution of the abscess the cyst wall must be excised to prevent recurrence.', 'role': 'assistant'}]