Though the vasculature, architecture and cytology mimic that of a hemangiopericytoma and a glomangioma, the formation of scattere round glandular spaces and the anatomic location of the lesion are much more consistent with a myoepithelial neoplasm of salivary gland origin. Immunohistochemical stains (smooth muscle-specific actin, calponin, S100, CD34, GFAP) and reticulin silver stain may help its confirmation. The tumor is quite cellular, but no apparent mititic figures, necrosis or anaplastic features are apparent on the available photos. This may be a cellular pleomorphic adenoma or monomorphic adenoma depending on the amount of characteristic myxoid stroma. The possibility of myoepithelial carcinoma is relatively low. Since the tissue received is disrupted without apparent capsule, re-excision is needed. 

 我再提供一个诊断:胸腺瘤A型。不知到底耳后哪里？高低情况？

 这是个涎腺来源的肿瘤，细胞并不恶，如果确无包膜，那是个低度恶性的；如果有包膜，象这种形态的肿瘤考虑多形性腺瘤也许是可以的。不是血管外皮瘤，也不是胸腺瘤。

 血管外皮瘤？良恶？？

（全片几乎无核分核象）

 

 

 

 

 耳后肿物，一般会联想到附近涎腺肿瘤。有腺样结构，梭形细胞为主。我看象肌上皮瘤，虽然未见明确核分裂倾向低恶。仅供参考。欢迎大家拍砖讨论。