The wide application of immunohistochemistry to the study of tumors has led to the
recognition that epithelial neoplasms composed of both a neuroendocrine and …

The growth in knowledge of the pathogenesis, molecular background, and
immunohistochemical profile of neuroendocrine neoplasms (NENs) has led not only to an …

Background The incidence of 2 distinct tumor types occupying the same anatomic location is
rarely observed and may be accounted for by 2 separate mechanisms: tumor-to-tumor …

Interventions: Both cases underwent transsphenoidal microsurgical resection of pituitary
adenoma. Outcomes: The tumor was completely resected, and the pathological examination …

Detailed analysis of cytodifferentiation and hormone production has classified pituitary
neuroendocrine tumors (PitNETs) in a formal system that reflects the lineage differentiation …

Objective The collision of pituitary adenoma and craniopharyngioma is extremely rare and
thus there remains a paucity of data. Methods We described a patient from our institution …

Background Different diseases may occur within the same anatomic space and invade one
another. Lesions of this nature are described as collision tumors. Collision tumors of the …

Background Pituitary adenomas are the most common lesion of the sellar region. Very few
cases in the literature have described their association with craniopharyngiomas in the …

Collision tumors of the sellar region are relatively uncommon and consist mainly of more
than one type of pituitary adenoma or a cyst or cystic tumor. The association of a pituitary …

Sellar region lesions include a broad range of benign and malignant neoplastic as well as
non-neoplastic entities, many of which are newly described or have recently revised …