Question
A patient presents with poor vision in one eye. Macular edema and a peripheral retinal vascular lesion that contains feeder vessels are found in the periphery. Tests show an abnormality in the 3p25-26 gene. Which of the following would you not expect to find?
| A. |
retinal capillary hemangioma.
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| B. |
central nervous system hemangioblastoma.
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| C. |
cardiac rhabdomyoma.
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| D. |
pheochromocytoma
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Show Answer
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Correct Answer � C
Explanation
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Answer: C Cardiac Rhabdomyoma
Explanation:Cardiac rhabdomyoma is not associated with von Hippel-Lindau.
Von Hippel-Lindau syndrome is an inherited disorder characterized by the formation of tumors and fluid-filled sacs (cysts) in many different parts of the body. Tumors may be either noncancerous or cancerous and most frequently appear during young adulthood.
Tumors called hemangioblastomas are characteristic of von Hippel-Lindau syndrome. These growths are made of newly formed blood vessels. Although they are typically noncancerous, they can cause serious or life-threatening complications. Hemangioblastomas that develop in the brain and spinal cord can cause headaches, vomiting, weakness, and a loss of muscle coordination (ataxia). Hemangioblastomas can also occur in the light-sensitive tissue that lines the back of the eye (the retina). These tumors, which are also called retinal angiomas, may cause vision loss.
People with von Hippel-Lindau syndrome commonly develop cysts in the kidneys, pancreas, and genital tract. They are also at an increased risk of developing a type of kidney cancer called clear cell renal cell carcinoma and a type of pancreatic cancer called a pancreatic neuroendocrine tumor.
Von Hippel-Lindau syndrome is associated with a type of tumor called a pheochromocytoma, which most commonly occurs in the adrenal glands (small hormone-producing glands located on top of each kidney). Pheochromocytomas are usually noncancerous. They may cause no symptoms, but in some cases they are associated with headaches, panic attacks, excess sweating, or dangerously high blood pressure that may not respond to medication. Pheochromocytomas are particularly dangerous in times of stress or trauma, such as when undergoing surgery or in an accident, or during pregnancy.
About 10 percent of people with von Hippel-Lindau syndrome develop endolymphatic sac tumors, which are noncancerous tumors in the inner ear. These growths can cause hearing loss in one or both ears, as well as ringing in the ears (tinnitus) and problems with balance. Without treatment, these tumors can cause sudden profound deafness.
Noncancerous tumors may also develop in the liver and lungs in people with von Hippel-Lindau syndrome. These tumors do not appear to cause any signs or symptoms.
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