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Giant and ‘invasive’ pituitary tumors are among the more complex challenges facing neurosurgeons today [11, 13, 14, 24]. Although histologically benign, some achieve massive size and invade diverse anatomical structures [25, 44]. Their invasiveness and size make surgery difficult, sometimes dangerous [1, 5, 13, 18, 23, 44, 47], and the results of radiation therapy are inconsistent [13, 27, 34, 46].
Summary Haemangiopericytomas of central nervous system (CNS) were first defined as a separate entity in 1942. Previously they were either considered to be a histological variant of an angioblastic meningioma or a distinctive mesenchymal neoplasm. Most commonly they are located in parasagittal and falcine region. Tumours in the sellar/parasellar location are very rare and commonly escape diagnosis...
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