Intestinal intussusception in a newborn is a casuistic rarity, the clinical symptoms of which are nonspecific, and patients are regarded for a relatively long time as patients with necrotic enterocolitis. There are no unambiguous radiological signs of this  pathology,  especially with  atypical  variants of intussusception, when even pneumoirrigography is uninformative. In the vast majority of cases, the diagnosis is made only intra-operatively, when the development of intestinal obstruction or perforated peritonitis determines the need for surgical intervention. The publication presents a unique observation of preoperative echographic diagnosis and successful cure of prolonged small-intestinal invagination in a premature newborn 2 days of life, the cause of which was Meckel’s diverticulum.

Massive splenic infarction (SI) is an extremely rare disease in childhood, the genesis of which is not always clear. Most often in children, SI develops against the background of oncohematological (in particular, myeloid leukemia), hematological (sickle cell anemia) and infectious (malaria, mononucleosis, cytomegalovirus infection) diseases and is small in size. Two own observations are presented, unique in the absence of a clear cause of SI and the massiveness of the lesion. In the first case, a 10­year­old girl was admitted to the hospital on about the 10th day of illness with complaints of undefined abdominal pain, about which she had already twice applied to other hospitals in Moscow. SI was suspected on ultrasound and confirmed on CT, and then the echographic dynamics of SI was followed for more than 2 months. Against the background of anticoagulant, antibacterial and symptomatic therapy, recovery was achieved. In the second case, total SI was observed in a premature infant with severe multiple organ failure. The publication is extensively illustrated and contains a brief review of the literature.

Aim: to determine the diagnostic value of individual  echographic symptoms in abdominal cysts in newborns.Мaterials and Methods. The results of ultrasound  examination of 65 newborns (the average age 15.93 ± 1.15 days) with intraabdominal cysts (IACs) diagnosed with echography from 2004 to 2016 are analyzed. Girls were 80% (52/65), boys – 20% (13/65).  Results. 23 (35%) neonates had complicated ovarian cysts (OC) (antenatal torsion, necrosis of the cystic formation and ipsilateral ovary), in 16 (25%) cases uncomplicated OC were detected. In 14 (22%) cases enterocysts (8 girls, 6 boys) were detected, and mesenteric lymphangiomas (LAB) were diagnosed in 12 (18%) newborns (5 girls, 7 boys). The main echographic signs of various IACs were picked out.Conclusion. Ultrasonography is an informative method of diagnostics the IACs in newborns. The presence of parietal intraluminal cysts was typical for OC. In the case of uncomplicated OC anechogenous contents were noted. In the case of complicated OC heterogeneous content of various echostructure (debris, clots, septa and a networked structure of the content) took place. For the enterocysts a thick wall was typical and it’s variants of echographic representation were the gut-signature (double wall sign), layered  structure of the wall and Y-configuration of the cyst wall. LAB were characterized by irregular shape, thin wall and anechogenous content, less often the disperse component and thin septa in the lumen were determined. The networked structure of the contents was detected at various nosological forms (complicated OC, LAB and delimited peritonitis typical for severe enterocolitis) and required careful diagnostics of the totality of all detected echographic symptoms.

The diagnostic significance of the color Doppler study of testicular blood flow in testicular torsion has been studied for about 40 years, however, the prognostic value of the results obtained is ambiguous, as are the actual imaging capabilities of the technique. Our own experience of 110 observations of testicular torsion in children older than the neonatal period allows us to draw statistically reliable conclusions. Made on equipment premium-class research made it possible to evaluate how visualization intratesticular vascular pattern, and whirpool-sign and submit the primitive model of the actual inversion, explaining the impossibility of rendering whirpool-sign with the greatest tight inversion. The dynamics of testicular blood flow was studied immediately after successful and unsuccessful manual detorsion and in the long term after operative detorsion and orchopexy. The publication contains a brief analysis of the literature and is extensively illustrated.

Lemierre syndrome is extremely rare and poorly known to medical practitioners. In  childhood, this is completely casuistry, described almost exclusively in adolescents. The  key component of the syndrome is jugular vein thrombosis and sinus thrombosis, which develop against the background of polysinusitis and  purulent  otitis  and  are also  accompanied by  the  addition  of  pneumonia, meningitis  and  sepsis. Typically,  Lemierre’s syndrome is considered otogenic or sinusogenic sepsis. The nonspecificity of clinical manifestations against the background of the patient’s severe general condition determines the need for quick and accurate diagnosis, and ultrasound takes the first place in a series of radiation research methods, which allows differentiating jugular vein thrombosis. When the latter is found, MRI and CT are usually performed, in which  the presence of sinus thrombosis, inflammatory changes in the paranasal sinuses, pneumonia, etc. are usually confirmed. Further clinical and laboratory examination is designed to assess the presence of meningitis and a violation of the blood coagulation system. This publication provides 3 atypical observations of Lemierre’s syndrome in children: in the first case, it was thrombosis of the jugular vein that was first detected in an adolescent, and only then all other components of the syndrome; in the second case, the child was only 3 years old, which is completely atypical for this pathology, the third patient was 1 month old, and the diagnosis of Lemierre syndrome was made retrospectively. All children underwent a complex radiation examination, operated on, received massive syndrome therapy and were discharged home with recovery. The publication is extensively illustrated and contains a brief overview of the literature.