An 83-year-old male patient had undergone surgical removal of a mass in his left upper
arm 5 years ago, but its specific diagnosis was unknown. Two years ago, the mass recurred.
The mass was associated with pain, redness, swelling, and elevated skin temperature
for a month. Palpation revealed a soft mass and plain magnetic resonance imaging (MRI)
showed an oval-shaped mass with an abnormal signal behind the triceps at the proximal
end of the left upper arm, with a size of 6.5 × 7.4 × 12.5 cm, and equal or slightly
low signal on T1-weighted images and mixed high signal on T2-weighted and short tau
inversion recovery images. There were multiple hairline, flocculent, low-intensity
lesions on short tau inversion recovery images, with low-intensity surrounding the
lesion on each sequence and adjacent muscles appearing pushed and deformed. Multiple
lymph nodes in the left axilla were enlarged, and no abnormal signals were found in
relation to the left humerus (Fig. 1A–D). A dermoid cyst was diagnosed based on pathological examination (Fig. 2).
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References
- Retrorectal developmental cysts in adults: clinical and radiologic-histopathologic review, differential diagnosis, and treatment.Radiographics. 2001 May-Jun; 21: 575-584
- Perineal dermoid cyst in a young male.Urol Case Rep. 2020 Jul 22; 33101358
- Ultrasonographic findings of pediatric dermoid cyst.Pediatr Int. 2020 Jul 24;
Article info
Publication history
Published online: May 17, 2022
Accepted:
February 22,
2022
Received:
June 8,
2021
Identification
Copyright
© 2022 Published by Elsevier Inc. on behalf of Southern Society for Clinical Investigation.
