Epidermoid cyst in the upper arm
Citation, DOI, disclosures and case data
Rane D, Epidermoid cyst in the upper arm. Case study, Radiopaedia.org (Accessed on 10 Jun 2023) https://doi.org/10.53347/rID-38378
At the time the case was submitted for publication Digvijay Rane had no recorded disclosures.View Digvijay Rane's current disclosures
16 Jul 2015
21 times, by 3 contributors - see full revision history and disclosures
The patient complains of nontender swelling in lateral aspect of arm since 4 years.
From the case: Epidermoid cyst in the upper arm
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A well defined, homogenous, oval lesion is seen in subcutaneous region in lateral aspect of upper arm. It appears hypointense on T1WI and hyperintense on T2WI and FS as well as STIR images and shows no obvious enhancement on postcontrast images.
The underlying deltoid muscle and humerus appear normal.
- Epidermoid cysts are also called as epidermal cysts or epidermal inclusion cysts.
- These cysts occur due to proliferation of epidermal cells.
- Multiple mechanisms are suggested in the formation of epidermoid cysts.
- In some studies, HPV is also indicted in the etiology of these cysts.
- It appears hypointense on T1WI and hyperintense on T2WI.
- On T1FS images it shows suppression, while on post-contrast study it shows generally minimal peripheral enhancement with non-enhancing central part or may be entirely non-enhancing.
- Meyers SP. MRI of Bone and Soft Tissue Tumors and Tumorlike Lesions. Thieme. (2011) ISBN:3131618817. Read it at Google Books - Find it at Amazon
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