Calcifications in pituitary neuroendocrine tumors are reported in 0.2–8% of cases.
Therefore pituitary neuroendocrine tumors may be mimicked by other tumors located in the sellar region
Although MRI is the imaging study of choice for evaluation of sellar lesion or in the context of known or highly suspected pathology, the MR appearance of different sellar/parasellar lesions may be very similar, which often leads to misdiagnosis.
While the most common cause of a pituitary mass is an adenoma, the differential diagnosis is broad and includes
Abscess, as well as uncommon types of sellar/parasellar tumors like hemangioblastoma.
pituitary neuroendocrine tumor.
Neurohypophyseal tumors are rare.
The term atypical adenoma (APA) was revised in the old 2004 World Health Organization (WHO) classification of pituitary tumors.