ABSTRACT. At our academic institution, we have noticed repeated examples of both false-positive and false-negative MR diagnoses in breast cancer. The most common diagnostic errors in interpreting MRI of the breast are discussed in this review and experience-based advice is provided to avoid similar mistakes. The most common reasons for false-positive diagnoses are misinterpretation of artefacts, confusion between normal enhancing structures and tumours and, above all, insufficient use of the American College of Radiology breast imaging reporting and data system lexicon, whereas false-negative diagnoses are made as a result of missed tiny enhancement, a background-enhancing breast, or enhancement interpreted as benign rather than malignant.

The number of beak signs and the location of the transition zone in relation to the anterior peritoneal layer are independent signs associated with the success or failure of nonsurgical treatment.

In patients with breast cancer seen at MR imaging, retrospective evaluation of the prior MR imaging studies showed potential observer error in 47% of cases, resulting more from misinterpretation than from nonrecognition or mismanagement of cancers.

The relationship between chemical composition and feeding deterrent activity of seven essential oils is explored, including those from Syzygium aromaticum (L.) Merr. & Perry (Myrtaceae), Cinnamomum zeylanicum Blume (Lauraceae), Lavendula latifolia (L.) Medicus, Lavendula angustifolia L., Mentha crispa L., Mentha arvensis L. and Mentha piperita L. (Lamiaceae) against an important agricultural pest, the cabbage looper (Trichoplusia ni Hübner, Noctuidae), using a leaf‐disc choice bioassay. Comparison of the deterrent activity of ‘full mixtures' with respective artificial blends missing individual constituents demonstrates that, for most oils, minor constituents in a mixture can be as important as major constituents with respect to the overall feeding deterrent effect. There is a lack of correlation between the feeding deterrent effect of an individual constituent of an essential oil and its contribution to the overall activity of the ‘full mixture’ in some cases. The effect of removing an individual constituent from the mixture of an essential oil depends on the unique properties of the mixture, which in turn may reflect the interaction of its constituents. Understanding the role and contribution of each constituent to the overall activity of the oil can facilitate the creation of artificial blends that optimize their efficacy against different pests.