HEMANGIOPERICYTOMAS
\hˌɛmɐŋɡɪˌə͡ʊpɹɪsɪtˈə͡ʊməz], \hˌɛmɐŋɡɪˌəʊpɹɪsɪtˈəʊməz], \h_ˌɛ_m_ɐ_ŋ_ɡ_ɪ__ˌəʊ_p_ɹ_ɪ_s_ɪ_t_ˈəʊ_m_ə_z]\
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A tumor composed of spindle cells with a rich vascular network, which apparently arises from pericytes, cells of smooth muscle origin that lie around small vessels. Benign and malignant hemangiopericytomas exist, and the rarity of these lesions has led to considerable confusion in distinguishing between benign and malignant variants. (From Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1364)
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Word of the day
Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.