### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My son, Kanishk age : 15 Yrs,  is suffering from mild fever between 97.5 ~ 100 degree F varies day to day.1. A lot of tests of Blood has been conducted.2. Chest X-ray clear.. normal3. In ultra sound, the report is as under.............Liver is mildly enlarged in size, measures 16.2.cm and shows mildly coarse echotexture. No focal tension seen. Intrahepatic biliary radicals are normal.Portal vein is normal, measures 8mm.Minimal fluid is seen in subhepatic space..Gall Bladder is distended and shows smooth walls. Lumen is echo free.CBD is not dilated.Pancreas is normal in size, shape and echotexture.Spleen is mildly enlarged in size and measures 13.5cm.The Kidneys are normal in size, shape and echopattern. No calculus or hydronephrosis seen. Corticomedullary differentiation and parenchymal thickness is preserved.Right Kidney measures 9.8cmLeft Kidney measures 9.9.cmNo enlarged retroperitoneal mesenteric nodes noted.Impression : Mild hepatosplenomegaly with coarse liver echotexture and minimal asites.==================================================We are in touch with Dr, he says no problem, wait and stopped all medicines.No weight loss in last 3-4 months.Please, help.

### output:

Hello and welcome to Chat Doctor, The presence of low grade fever, mild hepatosplenomegaly at 15 years of age is highly suggestive of infectious mononucleosis. However, there are many other conditions which cause similar symptoms and signs. Infectious mononucleosis is caused by Epstein Barr virus. There are many other viral infections causing fever with hepatosplenomegaly. These viruses are - CMV, rubella, etc. Other infections are - leishmaniasis, malaria, schistosomiasis, etc. Malignant conditions can also lead to similar picture e.g. lymphoma, myeloproliferative disorders, etc. Infections are more common than malignancies. Monospot test is a test done for confirming infectious mononucleosis. Consult your doctor for further investigations and thus management. Thanks and take care Chat Doctor. 