Stevens–Johnson syndrome (SJS) is a type of severe skin reaction. The most common cause is certain medications such as lamotrigine, carbamazepine, allopurinol, sulphonamide antibiotics, and nevirapine.

Answer: Cystine stoneCystinuria is a genetic cause of kidney stones with an average prevalence of 1 in 7000 births. Cystine stones are found in 1 to 2 percent of stone formers, although they represent a higher percentage of stones in children (approximately 5 percent). Cystinuria is an inherited disorder. Inherited means it is passed down from parents to children through a defect in a specific gene. In order to have cystinuria, a person must inherit the gene from both parents. Cystine is a homodimer of the amino acid cysteine. Patients with cystinuria have impairment of renal cystine transport, with decreased proximal tubular reabsorption of filtered cystine resulting in increased urinary cystine excretion and cystine nephrolithiasis. The cystine transporter also promotes the reabsorption of dibasic amino acids, including ornithine, arginine, and lysine, but these compounds are soluble so that an increase in their urinary excretion does not lead to stones. Intestinal cystine transport is also diminished, but the result is of uncertain clinical significance.Cystinuria only causes symptoms if you have a stone. Kidney stones can be as small as a grain of sand. Others can become as large as a pebble or even a golf ball. Symptoms may include:Pain while urinatingBlood in the urineSharp pain in the side or the back (almost always on one side)Pain near the groin, pelvis, or abdomenNausea and vomitingStruvite stones are a type of hard mineral deposit that can form in your kidneys. Stones form when minerals like calcium and phosphate crystallize inside your kidneys and stick together. Struvite is a mineral that’s produced by bacteria in your urinary tract. Bacteria in your urinary tract produce struvite when they break down the waste product urea into ammonia. For struvite to be produced, your urine needs to be alkaline. Having a urinary tract infection can make your urine alkaline. Struvite stones often form in women who have a urinary tract infection.Calcium oxalate stones are the most common type of kidney stone. Kidney stones are solid masses that form in the kidney when there are high levels of calcium, oxalate, cystine, or phosphate and too little liquid. There are different types of kidney stones. Your healthcare provider can test your stones to find what type you have. Calcium oxalate stones are caused by too much oxalate in the urine.What is oxalate and how does it form stones?Oxalate is a natural substance found in many foods. Your body uses food for energy. After your body uses what it needs, waste products travel through the bloodstream to the kidneys and are removed through urine. Urine has various wastes in it. If there is too much waste in too little liquid, crystals can begin to form. These crystals may stick together and form a solid mass (a kidney stone). Oxalate is one type of substance that can form crystals in the urine. This can happen if there is too much oxalate, too little liquid, and the oxalate “sticks” to calcium while urine is being made by the kidneys.Uric acid stones are the most common cause of radiolucent kidney stones in children. Several products of purine metabolism are relatively insoluble and can precipitate when urinary pH is low. These include 2- or 8-dihydroxyadenine, adenine, xanthine, and uric acid. The crystals of uric acid may initiate calcium oxalate precipitation in metastable urine concentrates.Uric acid stones form when the levels of uric acid in the urine is too high, and/or the urine is too acidic (pH level below 5.5) on a regular basis. High acidity in urine is linked to the following causes:Uric acid can result from a diet high in purines, which are found especially in animal proteins such as beef, poultry, pork, eggs, and fish. The highest levels of purines are found in organ meats, such as liver and fish. Eating large amounts of animal proteins can cause uric acid to build up in the urine. The uric acid can settle and form a stone by itself or in combination with calcium. It is important to note that a person’s diet alone is not the cause of uric acid stones. Other people might eat the same diet and not have any problems because they are not prone to developing uric acid stones.There is an increased risk of uric acid stones in those who are obese or diabetic.Patients on chemotherapy are prone to developing uric acid stones.Only cystine stone is inherited.

Answer: LaparoscopyThe diagnostic accuracy of laparoscopy for impalpable testis is well recognized. Approximately 20% of undescended testes are truly impalpable, and laparoscopy is actually regarded as the gold standard for their localization| none of the currently available imaging techniques (ultrasound, computerized tomography, or magnetic resonance imaging) has proven to be 100% reliable in predicting the presence or absence of a testis.In this respect, not only can laparoscopy be considered the most reliable tool to provide information on the location of the testis but also to confirm its absence.Undescended testes in boys is a very common congenital abnormality in which one or both testes does not reach the bottom of the scrotum prior to birth. The incidence of the condition is 3–5% among all boys at birth, and decreases to 0.8–1% after 6 months of age.Males with undescended testes have a lower sperm count, poorer quality sperm, and lower fertility rate, compared to males whose testicles descend normally| the rate of subfertility increases with bilateral involvement and increasing age at the time of orchidopexy.

As this boy has experienced significant dry spells in the past, it is unlikely that a structural abnormality is causing the enuresis. The only therapies that have been shown to be effective in randomized trials are alarm therapy and treatment with desmopressin acetate or imipramine. Bladder training exercises are not recommended. Desmopressin acetate is the preferred medication for treating children with enuresis.

A local exam might not help in locating the cause of the bleeding because it might be underneath the superficial structures. A thorough examination should be done under GA to accurately locate the source of bleeding.

Embryologically the testes are retroperitoneal structures in the posterior abdominal wall, attached to the anterolateral abdominal wall by the gubernaculum. The gubernaculum ‘pulls’ the testes through the deep inguinal ring, inguinal canal and superficial inguinal ring and over the pelvic brim. The gubernaculum is preceded by the processus vaginalis that is derived from the peritoneum anterior to the testes. The processus vaginalis pushes the muscle and fascial layers. These eventually make up the canal and the spermatic cord, into the scrotum. The gubernaculum persists as the scrotal ligament while part of the processus vaginalis remains as a bursa-like sac i.e. the tunica vaginalis testes. The testes therefore could be caught in any one of these places along its path of descending. The testes are never in the perineum.

Rhabdomyosarcoma originates from skeletal muscle cells. A biopsy is needed for grading according to microscopy. Most patients are adult females.

Answer: Torsion of a testicular hydatidThe appendix testis (or hydatid of Morgagni) is a vestigial remnant of the Müllerian duct, present on the upper pole of the testis and attached to the tunica vaginalis. It is present about 90% of the time. The appendix of testis can, occasionally, undergo torsion (i.e. become twisted), causing acute one-sided testicular pain and may require surgical excision to achieve relief. One third of patients present with a palpable blue dot discoloration on the scrotum. This is nearly diagnostic of this condition. If clinical suspicion is high for the serious differential diagnosis of testicular torsion, a surgical exploration of the scrotum is warranted. Torsion of the appendix of testis occurs at ages 0-15 years, with a mean at 10 years, which is similar to that of testicular torsion.Occasionally a torsion of the hydatid of Morgagni can produce symptoms mimicking those created by a testicular torsion| a torsion of the hydatid, however, does not lead to any impairment of testicular function.Absence of the cremasteric reflex is a sign of testicular torsion. This therefore confirms that the diagnosis is Torsion of a testicular hydatid.

A teratoma is a tumour containing tissue elements that are similar to normal derivatives of more than one germ layer. They usually contain skin, hair, teeth and bone tissue and are more common in children, behaving as a benign tumour. After puberty, they are regarded as malignant and can metastasise.

Prophylactic antibiotics should be given to the child to avoid infections and renal injury.