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Large commercial aircraft are much more easily identified by radar than are fighter aircraft, because the former's two-dimensional images have sufficient details to let one recognize the aircraft's shape. The usual problem with identification based on shape is lack of knowledge of the aspect angle. As an indication of the relative ease with which commercial aircraft can be identified, this note describes a shape-based identification method that does not require knowledge of the aspect angle.

Responses in turntable radar imagery are properly focused if they behave as fixed point scatterers in the focal plane chosen for polar reformatting. Other responses, whether generated by more complicated backscattering or by fixed point scatterers outside the focal plane, have a curved image phase. This curved phase can be used to recognize responses due to reflection between separated scatterers, and to determine the locations of the contributing scatterers, whether the scatterers are located on the target, its mount, or the turntable. We demonstrate this traceback procedure on data of a ground vehicle.

COVID-19 vaccines were introduced soon after the COVID-19 pandemic emerged in 2020. Various side effects were reported worldwide, including several types of common systemic side effects such as fever and general fatigue. Reports of other rare manifestations also emerged. We report the case of an adult male with a rare systemic syndrome mimicking lymphoma after he had received the first dose of an mRNA-based COVID-19 vaccine. After nearly 6 months of investigation with suspicion for an infection or malignancy, all symptoms resolved, laboratory tests normalized, and imaging showed no sign of active disease., Learning Points: A lymphoma-like reaction is a possible side effect of COVID-19 vaccination.It is important to rule out other causes of systemic symptoms before diagnosing a reaction to a COVID-19 vaccine.A lymphoma-like reaction following administration of a COVID-19 vaccine has a good prognosis., Competing Interests: Conflicts of Interests: The Authors declare that there are no competing interests., (© EFIM 2022.)

Objectives: This study sought to use echocardiography to evaluate the prevalence of muscular ventricular septal defect in neonates., Background: Ventricular septal defect is usually asymptomatic and closes spontaneously. An increase in its prevalence has been noted recently. One reason is the improved detection of small defects, especially with the increased used of echocardiography. Therefore, one would expect a higher prevalence in neonates on the basis of echocardiographic screening., Methods: Color Doppler echocardiography was performed in 1,053 consecutive neonates 6 to 170 h old at Western Galilee Hospital, Israel. Data on the neonates, parents and family were obtained to analyze the influencing factors. The identified patients were followed up for 1 to 10 months or until ventricular septal defect closure., Results: Muscular ventricular septal defect was found in 56 (25 male, 31 female) of the 1,053 neonates, a prevalence of 53.2/1,000 live births. All neonates were asymptomatic. Six had a systolic murmur. Electrocardiographic findings were normal in 44 (97.8%) of 45 neonates followed up, and left ventricular hypertrophy occurred in 1 (2.2%). By echocardiography, 50 ventricular septal defects (89.3%) were single and 6 (10.7%) were multiple. The defects (range 1 to 5 mm in diameter, mean [+/- SD] 2.3 +/- 0.8) occurred anywhere along the muscular septum; 43 (76.8%) were detectable only on color Doppler imaging. The left atrium and left ventricle were mildly dilated. Of 45 neonates who were followed up for 6 to 10 months or until closure of the defects, 40 (88.9%) had defects that closed spontaneously. The risk of ventricular septal defect was not significantly associated with gestational age, birth weight, birth order, maternal age, diabetes, smoking, exposure to drugs or infection, paternal age, familial congenital heart disease, religion or consanguinity., Conclusions: There is a prevalence of muscular ventricular septal defect in neonates of 53.2/1,000 live births. The patients were asymptomatic, and 88.9% had defects that closed spontaneously within 1 to 10 months. These defects may be caused by environmental factors. In many cases, muscular ventricular septal defect may also result from delayed physiologic development.

The effects of electrical stimulation in conjunction with traditional physical therapy, on knee extensor lag and length of hospital stay among patients recovering from total knee arthroplasty were assessed. Forty patients who underwent total knee replacement (TKR) were randomly assigned to either an electrical stimulation group (16 females, 5 males), or a control group (15 females, 4 males). Both groups received conventional physical therapy including continuous passive motion (CPM) to the affected limb, ambulation training, range of motion exercises, and activities of daily living (ADL) training. The experimental group additionally received electrical stimulation during CPM treatment. Experimental group subjects reduced their extensor lag from 7.5 to 5.7 degrees, whereas control group extensor lag increased from 5.3 to 8.3 degrees. These trends were significantly different (p < .01). Rehabilitation discharge criteria were reached in 6.7 days in the experimental group and 7.4 days in the control group. These differences were also significant (p < .05). The results of this study indicate that the application of electrical stimulation during recovery from TKR can effectively reduce extensor lag and decrease the length of hospital stay.

Recently Maroteaux et al. [Am J Med Genet 32:371-375] described omodysplasia as a new distinct congenital bone disorder in 3 cases; autosomal dominant inheritance was suggested. In this same report, 2 other cases (patients 4 and 5) presented with the same facial and upper limb anomalies, but were also noted to have severe shortness of lower limbs. The authors considered all 5 cases to represent variable expressivity of the same disorder, namely, omodysplasia. Here we report 4 patients (3 survivors), offspring of consanguineous Arabic-Moslem couples. All presented at birth with severe short limb dwarfism and facial and radiologic appearance quite distinct from the first 3 patients of Maroteaux et al. [1989] with so-called omodysplasia. Thus, we suggest that our 4 cases and patients 4 and 5 of Maroteaux et al. [1989] represent a distinct, previously unpublished bone dysplasia.