"Modern Family" actress Sarah Hyland has kidney dysplasia and underwent a kidney transplant this year, Seventeen magazine reported.

Hyland, 21, told the magazine that her father donated one of his kidneys to her.

"You know that family is going to be there for you no matter what. My dad gave me a freakin' kidney!" Hyland told Seventeen. "But it's also the families that you create outside of your family. And you really find out what kind of people you're friends with."

Kidney dysplasia, also known as multicystic dysplastic kidney, occurs when there are problems with the kidneys as they develop, and cysts -- which are filled with fluid -- grow where normal kidney tissue is supposed to be, according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).

Usually, just one kidney is affected by kidney dysplasia; if this is the case, someone with kidney dysplasia may experience few, if any, problems from the condition. But if kidney dysplasia affects both kidneys, then the person may need to undergo dialysis -- where a machine filters waste from the body in place of the kidneys -- or have a kidney transplant.

Today, kidney dysplasia can be diagnosed while the baby is still in the womb. After birth, a renal and bladder ultrasound is then conducted to confirm the condition; on the ultrasound, a kidney affected by kidney dysplasia will just appear as cysts, according to the Children's Hospital of Philadelphia.

The condition occurs about once out of every 4,300 live births, according to Children's Hospital Boston. It's more common in white people, but is about equally common in males and females.

There is no "one way" to treat kidney dysplasia, according to Children's Hospital Boston. Most doctors recommend monitoring the affected kidney, because -- while rare -- high blood pressure or tumors can develop. Some parents may opt for their child to undergo surgery, called a nephrectomy, to remove the kidney.

Children's Hospital Boston reports:

The long-term outlook for a child with a complete or partial nephrectomy is very good, since most people have a second, normally functioning kidney that can adequately meet the body's needs.

To see what other celebrities have undergone organ transplants in the past, click through the slideshow:

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  • Gregg Allman

    Musician Gregg Allman, of the Allman Brothers Band, had a liver transplant in 2010 after his liver was damaged from Hepatitis C. MSNBC reported that he had the <a href="http://today.msnbc.msn.com/id/37881181/ns/today-entertainment/t/gregg-allman-has-successful-liver-transplant/#.T7E0FJ9Ytvc" target="_hplink">transplant at the Mayo Clinic</a> in Florida. <br> <br> The <em>New York Times</em> reported that Allman said he may have <a href="http://artsbeat.blogs.nytimes.com/2010/06/23/gregg-allman-recovering-after-liver-transplant/" target="_hplink">developed Hepatitis C</a> by coming in contact with a contaminated tattoo needle.

  • Natalie Cole

    The Grammy-winning singer underwent kidney transplant surgery in 2009. <br> <br> Cole's <a href="http://articles.nydailynews.com/2009-05-21/gossip/17922645_1_new-kidney-natalie-cole-tour-dates" target="_hplink">kidney problems</a>, which began as a result of hepatitis C treatment, meant she had to have dialysis thrice weekly prior to the transplant, the <em>New York Daily News</em> reported.

  • Shelley Fabares

    Shelley Fabares, an actress on the TV show "Coach," had a <a href="http://abcnews.go.com/Entertainment/story?id=114015&page=1#.T7E9ip9Ytvc" target="_hplink">liver transplant</a> in 2000 after an autoimmune disease deteriorated her liver, ABC News reported.

  • Gary Coleman

    The "Diff'rent Strokes" actor, who passed away at age 42 in 2010 of a brain hemorrhage, had multiple health problems, including the kidney condition <a href="http://articles.cnn.com/2010-05-28/health/coleman.kidney.troubles_1_intracranial-hemorrhage-kidney-transplant-clot/2?_s=PM:HEALTH" target="_hplink">nephritis</a> that prompted two transplants during his childhood, CNN reported. <br> <br> The first transplant occurred when Coleman was 5, but he had to undergo a second <a href="http://articles.cnn.com/2010-05-28/health/coleman.kidney.troubles_1_intracranial-hemorrhage-kidney-transplant-clot/2?_s=PM:HEALTH" target="_hplink">kidney transplant</a> when he was 14, according to CNN. <br> <br> <em>People</em> magazine reported that at one point in Coleman's life, he had to <a href="http://www.people.com/people/article/0,,20389492,00.html" target="_hplink">undergo dialysis</a> -- where a machine works to filter waste because the kidneys aren't working properly -- four times in one day.

  • Dick Cheney

    The former vice president underwent a <a href="http://www.huffingtonpost.com/2012/03/24/dick-cheney-heart-transplant_n_1377487.html" target="_hplink">heart transplant</a> earlier this year, after enduring years of heart problems (including heart attacks). The Associated Press reported that Cheney, 71, had five heart attacks in the last 25 years. <br> <br> Cheney had previously had a "left ventricular assist device," or LVAD, installed to help his heart to pump blood. Had had also undergone quadruple bypass surgery, a pacemaker operation and two angioplasties, the <a href="http://www.huffingtonpost.com/2012/03/24/dick-cheney-heart-transplant_n_1377487.html" target="_hplink">Associated Press reported</a>.

  • Tracy Morgan

    The "30 Rock" actor had a <a href="http://www.huffingtonpost.com/2010/12/20/tracy-morgan-kidney-transplant_n_799489.html" target="_hplink">kidney transplant</a> in 2010 after spending <a href="http://today.msnbc.msn.com/id/40757166/ns/today-entertainment/t/tracy-morgan-resting-after-kidney-transplant/#.T7FFJJ9Ytvc" target="_hplink">15 years with diabetes</a>, MSNBC reported. <br> <br> Back in 2009, before the transplant, <em>TIME</em> reported that Morgan didn't always <a href="http://www.time.com/time/magazine/article/0,9171,1930509,00.html" target="_hplink">take his diabetes seriously</a>: <br> <br> <blockquote>My first season on 30 Rock, I wasn't taking the disease seriously. Then one day I got really sick. The doctor was like, "Hey, listen, we may have to take your foot." That was it for me. Now I take my insulin every day. My blood sugar doesn't get over 120.</blockquote>

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