<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Nipple shadows in chest xray characteristically have a sharp
Options:
A. Medial margin
B. Lateral margin
C. Superior margin
D. Inferior margin
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is B: Lateral margin. Explanation: Miller et al proposed that solitary pulmonary nodules that reach some or all of the following criteria can be considered nipple shadows :Bilateral and symmetric"fuzzy" margins or radiolucent "halo"Sharp lateral border and poorly defined medial border (may be present only on pa projections 3)Nodules are in a characteristic position:Male: between fifth and sixth rib anteriorlyFemale: at the inferior aspect of the breast shadowWere not present on a very recent filmProminent nipples may be visible on a lateral projectionHowever, if there is doubt repeat chest x-ray with nipple markers should be performed.(Ref: Miller WT, Aronchick JM, Epstein DM et-al. The troublesome nipple shadow. AJR Am J Roentgenol. 1985;145 (3): 521-3.)<|im_end|>
