Granuloma annulare on ultrasound: a diagnosis to consider in pediatric skin lesions.

Background: Granuloma annulare (GA) is a rare, benign, inflammatory, self-limited, granulomatous dermatosis that affects children and young adults. The most frequent clinical form is localized GA. Deep GA generally presents as painless palpable subcutaneous nodules in the lower extremities, buttocks, hands and scalp.

"Truffle sign". A suspicious malignant pattern of lymphadenopathies in children observed on ultrasound. Preliminary study.

Background: The differential diagnosis of lymphadenopathies in children including benign and malignant conditions is often difficult to identify by ultrasound (US). The lymphadenopathies in children are frequent and mostly benign, therefore it is essential to decide what patients should undergo further studies.

Objective: To describe the potential usefulness of a new suspicious ultrasound sign on pediatric lymphadenopathies that can orient the diagnosis of malignancy.

Pulmonary imaging in coronavirus disease 2019 (COVID-19): a series of 140 Latin American children.

Background: The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which resulted in the worldwide coronavirus disease 2019 (COVID-19) pandemic of 2020, has particularly affected Latin America.

Objective: The purpose of the study was to analyze the imaging findings of pulmonary COVID-19 in a large pediatric series.

Materials And Methods: Children with SARS-CoV-2 infection confirmed by either quantitative reverse transcription-polymerase chain reaction from nasopharyngeal swabs or presence of circulating immunoglobulin M (IgM) antibodies and who underwent chest radiograph or CT or both were included in this retrospective multicenter study.