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Gull Wings and Mouse Ears
Published in Michael E. Mulligan, Classic Radiologic Signs, 2020
The mouse whose rounded ears are most like the rounded erosions seen in patients with psoriatic arthritis might be Mickey Mouse or one of his compatriots (Figure 4). Mickey’s history is given in the discussion of the Mickey Mouse Sign. Martel says that he had no particular mouse in mind at the time the term was coined, although he does agree that Mickey’s ears would make suitable models (personal communication).
Test Paper 7
Published in Teck Yew Chin, Susan Cheng Shelmerdine, Akash Ganguly, Chinedum Anosike, Get Through, 2017
Teck Yew Chin, Susan Cheng Shelmerdine, Akash Ganguly, Chinedum Anosike
Patients with PSP exhibit atrophy of the midbrain and tegmentum, manifesting as third ventricular dilatation, reduced midbrain AP diameter or flattening of the superior midbrain. Reduced midbrain AP diameter at the level of the superior colliculi on axial images gives rise to the Mickey Mouse sign. Midbrain atrophy with relative preservation of pons produces the hummingbird sign or penguin sign. Additional findings include superior cerebellar peduncle atrophy and increased FLAIR signal, both of which have reasonably high sensitivity and specificity in distinguishing PSP from Parkinson’s disease and MSA.
Transnasal endoscopic marsupialization of nasopalatine duct cysts: A novel ‘Mickey Mouse’ sign and a septum-sparing surgical technique to reduce paresthesia risk
Published in Acta Oto-Laryngologica Case Reports, 2023
Shravan Gowrishankar, Nora Haloob, Claire Hopkins
Cross-sectional imaging in the form of CT and/or MRI is typically used to further characterize cysts in this area. Differentials of midline cysts include NPDCs, granulomas, central incisor root cysts, and median palatine cysts [7]. Nasolabial cysts usually appear laterally on either side of the midline [8]. NPDCs are usually well-defined oval, round, or heart-shaped cystic lesions close to the midline of the anterior maxilla [9]. In this patient’s case, the appearance of the cyst on the coronal section MRI produced a characteristic shape which can be referred to as the “Mickey Mouse” sign [10] as the cyst expands on either side of the maxillary crest (Figure 1(B)). This is the first such description using this easy-to-remember term and highlights possible alternative radiological appearances of NPDCs.and will help in radiological differentiation between other pathologies at this site presenting in a similar way. For instance, to our knowledge, nasolabial cysts, which usually form in the soft tissues around the upper lip, have not been reported with this sign. Nasolabial cysts usually appear ovoid on either side of the midline and are unilateral [11]. As they are soft tissue cysts [8], a lack of sharp bony structures in this area similar to the maxillary crest should preclude asymmetric expansion of a nasolabial cyst that could result in a bilobed appearance.