In medicine, an refers to radiological findings (CT, MRI, or ultrasound) that do not follow the standard presentation of a disease. These are critical "outliers" that often lead to diagnostic challenges.

: In liver imaging, certain subtypes of hepatocellular carcinoma (HCC) may not show the typical "washout" pattern, requiring advanced MRI feature identification to distinguish them from benign lesions.

: Atypical features can lead to initial misdiagnosis. For example, spontaneous intracranial hypotension can be missed if the imaging doesn't show standard signs, potentially leading to serious complications like cerebral venous thrombosis.

In creative fields, is a deliberate tool used to grab attention or convey complex metaphors.

Interestingly, the term often appears in reviews of the Netflix series , which focuses on a teenager on the autism spectrum.

: Ads often use atypical images—like depicting a text box as tape to suggest silencing or potato chips as flames to represent spiciness—to communicate flavor or social messages more effectively than standard photos.