en Gastroentrology Gastroentrology case report case report <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="color:#0000ff;"><strong><em>Background</em></strong><em>:</em></span> Focal nodular hyperplasia (FNH) is a benign rare liver neoplasm in children and includes only 2% of all pediatric liver tumors. Here we reported the case of a 14-year-old girl with vague flank pain who was managed conservatively.<br> <span style="color:#0000ff;"><strong><em>Case Presentation</em></strong><em>:</em></span> Our case is a 14-year-old child (female), with a 5 cm diameter lesion in the right lobe of the liver in CT scan, and histologic findings compatible with FNH. A solid mass lobulated contour, intense enhancement with a hypodense central area, possibly indicative of central scar, was seen. Despite her mild flank pain we did not insist on surgical resection and managed her conservatively. Her pain resolved 2 weeks later and an imaging follow-up with ultrasound 6 months later showed no increase in size or numbers.<br> <span style="color:#0000ff;"><strong><em>Conclusion</em></strong><em>:</em></span> FNH is an uncommon mass lesion in children. Our patient had mild symptomatic severity, and several guidelines recommend surgical treatment in this condition, but our team performed conservative and medical treatment for her and got the desired result. Therefore, the combination of these factors raises the importance of introducing the case. According to FNH&rsquo;s nature, stability, complications, and evaluation of pain are essential to avoid unnecessary surgeries.</span></span> Focal nodular hyperplasia, Child, Benign liver tumors, conservative management 460 463 http://caspjim.com/browse.php?a_code=A-10-1898-1&slc_lang=en&sid=1 Farzan Vahedifard farzanvahedi@yahoo.com 100319475328460031239 100319475328460031239 No Iran University of Medical Sciences, Tehran, Iran Masoud Mortezazadeh masoudmm1990@yahoo.com 100319475328460031240 100319475328460031240 Yes MD, Internal Medicine Resident, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran Abbas Mofidi mofidi_abbas@yahoo.com 100319475328460031241 100319475328460031241 No Faculty of Medicine, Iran university of Medical Sciences, Tehran, Iran Mehdi Kashani Dr.mehdikashani@gmail.com 100319475328460031242 100319475328460031242 No Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran Alireza Sharifi Rayeni rayeni13@yahoo.com 100319475328460031243 100319475328460031243 No Department of Gastroenterology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran