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Ciliated HPV-related Carcinoma: A Well-differentiated Form of Head and Neck Carcinoma That Can Be Mistaken for a Benign Cyst.

HPV相关性纤毛细胞癌:一种高分化的头颈部癌,易与良性囊肿混淆

Abstract

Although human papillomavirus (HPV)-related oropharyngeal carcinomas (HPV-OPCs) are generally regarded as "poorly differentiated," they actually maintain a close resemblance to the lymphoepithelium of the tonsillar crypts from which they arise: they are basaloid, exhibit minimal keratinization, and are often permeated by lymphocytes. In rare cases, the presence of cilia in a primary HPV-OPC and their persistence in lymph node metastasis can confound the distinction between a benign and malignant process. Three cases of ciliated HPV-OPCs were identified from the archives of The Johns Hopkins Head and Neck Pathology consultation service. HPV status was determined using p16 immunohistochemistry and high-risk HPV in situ hybridization. All 3 patients presented with a cystic lymph node metastasis without a known primary carcinoma. One metastasis was originally diagnosed as a branchial cleft cyst only to regionally recur 7 years later. In 2 cases, a primary HPV-OPC was found in the tonsil. The carcinomas exhibited both nonkeratinizing squamous epithelium and cystic/microcystic spaces lined by ciliated columnar cells. Both the squamous and ciliated cells were HPV positive. This report draws attention to a novel variant of HPV-related head and neck cancer that exhibits ciliated columnar cells. This variant challenges prevailing notions that: (1) HPV-OPCs are uniformly poorly differentiated cancers; (2) cilia are an infallible feature of benignancy; and (3) presence of cilia is a reliable criterion for establishing branchial cleft origin when dealing with cystic lesions of the lateral neck.

摘要

虽然人类乳头状瘤病毒(HPV)相关性口咽癌(HPV-OPCs)通常被认为是低分化的,实际上它仍保持与其起源处扁桃体隐窝的淋巴上皮高度相似:基底样、显示轻度角化、淋巴细胞常弥漫浸润。少见情况下,原发HPV-OPC中存在纤毛细胞、淋巴结转移中仍可见纤毛细胞,从而混淆良恶性病变的区别。从约翰霍普金斯大学头颈部病理咨询服务部档案中确认3例纤毛HPV-OPCs,用p16免疫组化和高危HPV原位杂交分析来判断HPV状态。所有3例均表现为囊性淋巴结转移,原发癌灶不明。1例淋巴结转移被初诊为鳃裂囊肿,仅在7年后局部复发。有2例于扁桃体中发现原发性HPV-OPC。癌成分表现为非角化鳞状上皮和衬覆纤毛柱状细胞的囊性/微囊样腔隙。鳞状细胞和纤毛细胞的HPV都呈阳性。该报道引起了人们对表现为纤毛柱状细胞的HPV相关性头颈癌新亚型的注意。该亚型挑战了普遍观点:(1) HPV-OPCs是均匀一致的低分化癌;(2)纤毛是良性病变绝对可靠的特征;(3)对于颈侧部囊性病变,纤毛的存在是确定鳃裂囊肿来源的一项可靠标准。

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