With the recent U.S. Food and Drug Administration (FDA)-approval and rollout of the Pfizer-BioNTech and Moderna COVID-19 vaccines, it is important for radiologists to consider recent COVID-19 vaccination history as a possible differential diagnosis for patients with unilateral axillary adenopathy. Hyperplastic axillary nodes can be seen on sonography after any vaccination but are more common after a vaccine that evokes a strong immune response, such as the COVID-19 vaccine. As the differential of unilateral axillary adenopathy includes breast malignancy, it is crucial to both thoroughly evaluate the breast for primary malignancy and to elicit history of recent vaccination. As COVID-19 vaccines will soon be available to a larger patient population, radiologists should be familiar with the imaging features of COVID-19 vaccine induced hyperplastic adenopathy and its inclusion in a differential for unilateral axillary adenopathy. Short-term follow-up for unilateral axillary adenopathy in the setting of recent COVID-19 vaccination is an appropriate recommendation, in lieu of immediately performing potentially unnecessary and costly axillary lymph node biopsies.

Which arene ligand coordinates? An intramolecular exchange previously unknown for RhI complexes in which the phenyl ether moieties bind alternately in an η6 fashion to the Rh1 center (in 1 and 1' on the right) is observed by two‐dimensional 1HNMR exchange spectroscopy. This exchange of the aryl ether‐phosphane ligands probably proceeds via intermediate 2 and therefore cannot be detected when the O atoms are exchanged for CH2 groups.

Hidradenitis suppurativa is a chronic debilitating disorder of the skin manifested by recurrent, painful, inflammatory, subcutaneous nodules. The lesions occur most commonly in the apocrine-gland-bearing skin sites such as the axillae and inguinal regions; they cause scarring and disfigurement from the formation of multiple abscesses and fistulous tracts within the skin. We report the radiologic manifestations of two cases of hidradenitis suppurativa in women who presented for breast imaging.

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