Modified U Slot Patch Antenna with Large Frequency Ratio for Vehicle-to-Vehicle Communication.

This paper presents a single-fed, single-layer, dual-band antenna with a large frequency ratio of 4.74:1 for vehicle-to-vehicle communication. The antenna consists of a 28 GHz inset-fed rectangular patch embedded into a 5.9 GHz patch antenna for dual-band operation. The designed dual-band antenna operates from 5.81 to 5.99 GHz (Dedicated Short Range Communications, DSRC) and 27.9 to 30.1 GHz (5G millimeter-wave (mm-wave) band). Furthermore, the upper band patch was modified by inserting slots near the inset feed line to achieve an instantaneous bandwidth of 4.5 GHz. The antenna was fabricated and measured. The manufactured prototype operates simultaneously from 5.8 to 6.05 GHz and from 26.8 to 31.3 GHz. Notably, the designed dual-band antenna offers a high peak gain of 7.7 dBi in the DSRC band and 6.38 dBi in the 5G mm-wave band.

Leprosy in a Patient With Lymphoma: A Challenge in the Twenty-First Century.

Leprosy, or Hansen's disease, mistakenly considered a disease from the past by some, is still common nowadays, especially in tropical and subtropical regions. In the absence of appropriate medical treatment, it may progress and cause permanent damage to multiple organs. This case report illustrates the diagnostic challenge of a south-american adult man who had been living in Europe for over 14 years. He was referred to the Hematology department due to persistent lymphocytosis and a CD5+ B-cell lymphoproliferative disorder was identified. During clinical surveillance, the patient developed skin lesions in his limbs with associated hypoesthesia. A histological diagnosis of lepromatous leprosy was made, and he underwent a long-term three-drug therapeutic regimen (dapsone, rifampicin, and clofazimine). Adding to the complexity of the case, the patient progressed with splenomegaly and constitutional symptoms, more than 7 years after development of lymphocytosis. Through a comprehensive evaluation, a definitive diagnosis of mantle cell lymphoma was established and received 6-cycle R-CHOP induction, followed by maintenance rituximab. Importantly, prophylaxis for leprosy reactivation was not administered as there were no recommendations in available guidelines. Eventually, the patient experienced a leprosy relapse while on maintenance therapy, 58 months after completing the initial anti-leprous treatment. Clinical response was attained with a new treatment regimen consisting of rifampicin, clofazimine, and minocycline.  Although leprosy is primarily observed in tropical and subtropical regions, the long incubation period of this disease combined with the global flow of migrants, made us consider it. Despite being rare, leprosy relapses can occur even after a few decades. The contribution of rituximab or previously administered chemotherapeutic agents is still unknown. The question remains whether antibiotic prophylaxis should be performed in patients undergoing immunochemotherapy for malignant diseases.

Pancitopenia en el contexto de una cistinosis nefropática / No disponible

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Persistent varicella as the initial manifestation of systemic lymphoma.

Varicella is a common benign childhood disease that often presents in adolescents and adults in a more severe form. We report a previously healthy 50-year-old man who developed multiple necrotic cutaneous ulcers associated with fever, asthenia and anorexia. Physical examination revealed few tense hemorrhagic vesicles on the trunk and necrotic cutaneous ulcers scattered over the entire cutaneous surface. After the diagnosis of varicella with varicella pneumonia was established, treatment with acyclovir was instituted. His poor response to treatment was indicative of immune compromise; an underlying peripheral T-cell lymphoma was discovered.