**Question 48: Neoplasm Affecting Vision**A 56-year-old woman gradually loses vision in the temporal parts of the visual fields of both eyes, beginning with the upper quadrants. An MRI of the head is most likely to show a neoplasm in which of the following?- A) Anterior perforated substance- B) Hypothalamus- C) Lateral geniculate body- D) Pituitary gland- E) Splenium of the corpus callosum**Correct Answer: D) Pituitary gland****Explanation:**This question requires knowledge of visual field defects and their neurological causes. The gradual loss of vision in the temporal fields of both eyes, starting with the upper quadrants, is indicative of a pattern known as bitemporal hemianopia. This type of visual field defect is often caused by a lesion affecting the optic chiasm, where the nasal fibers of the retina cross.A common cause of this pattern is a pituitary adenoma, which can compress the optic chiasm as it enlarges. An MRI scan would typically reveal a neoplasm in the region of the pituitary gland, confirming the diagnosis.Understanding these neuroanatomical relationships is crucial for proper diagnosis and treatment planning.

A neoplasm is an abnormal mass of actively dividing cells in the body. It may be classified as…

Answered: 48 A 56-year-old woman gradually loses…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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