Talk:Cock's peculiar tumour

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Cock's tumor is a giant proliferative/proliferating pilar / trichilemmal cyst. It is not sebaceous, this is a misnomer. It is a tumor, so tumour is not a misnomer. The suggestion that it looks like a granuloma is misleading and basically nonsense as granulomatous disease is really a histologic diagnosis. It is true that it might mimic carcinoma. Very rarely it can in fact develop malignant change with development of a squamous cell carcinoma. It is commonest in the scalp, especially of the elderly, women more often than men. The proliferating pilar cyst/tumor is usually solitary, but it often arises from a simple pilar cyst and these are multiple in 70% of cases.

For details on this tumor and its relationship to simple pilar / trichilemmal cyst see http://emedicine.medscape.com/article/1058907-overview http://emedicine.medscape.com/article/1060682-overview#a0104 ^[1] ^[2]

The term Cock's peculiar tumor is basically outadated, at least as regards the UK and US medical literature, and should be avoided except in the historic sense. References: ^[3]

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203.18.34.190 (talk) 04:32, 29 July 2011 (UTC)[reply]

^ Janitz J, Wiedersberg H. Trichilemmal pilar tumors. Cancer. Apr 1 1980;45(7):1594-7. [Medline].
^ Ye J, Nappi O, Swanson PE, Patterson JW, Wick MR. Proliferating pilar tumors: a clinicopathologic study of 76 cases with a proposal for definition of benign and malignant variants. Am J Clin Pathol. Oct 2004;122(4):566-74. [Medline].
^ Cock's Peculiar Tumor Andrew Affleck, MB, ChB, Bsc(Hons), MRCP(UK); Sandeep Varma, MB, ChB, MRCP(UK) Arch Dermatol. 2010;146(1):68.
^ Pathology of the skin Farmer ER and Hood AF eds 1990 Prentice Hall

[1] Janitz J, Wiedersberg H. Trichilemmal pilar tumors. Cancer. Apr 1 1980;45(7):1594-7. [Medline].

[2] Ye J, Nappi O, Swanson PE, Patterson JW, Wick MR. Proliferating pilar tumors: a clinicopathologic study of 76 cases with a proposal for definition of benign and malignant variants. Am J Clin Pathol. Oct 2004;122(4):566-74. [Medline].

[3] Cock's Peculiar Tumor Andrew Affleck, MB, ChB, Bsc(Hons), MRCP(UK); Sandeep Varma, MB, ChB, MRCP(UK) Arch Dermatol. 2010;146(1):68.

[4] Pathology of the skin Farmer ER and Hood AF eds 1990 Prentice Hall

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