Korean J Radiol.  2015 Jun;16(3):613-616. 10.3348/kjr.2015.16.3.613.

Brown Tumor of the Patella Caused by Primary Hyperparathyroidism: A Case Report

• Irie T
• Mawatari T
• Ikemura S
• Matsui G
• Iguchi T
• Mitsuyasu

• KMID: 2155531
• DOI: http://doi.org/10.3348/kjr.2015.16.3.613

Abstract

It has been reported that the common sites of brown tumors are the jaw, pelvis, ribs, femurs and clavicles. We report our experience in a case of brown tumor of the patella caused by primary hyperparathyroidism. An initial radiograph and CT showed an osteolytic lesion and MR images showed a mixed solid and multiloculated cystic tumor in the right patella. One month after the parathyroidectomy, rapid bone formation was observed on both radiographs and CT images.

Keyword

Brown tumor; Patella; Hungry bone syndrome

MeSH Terms

Adult
Bone Density
Bone Neoplasms/*etiology/radiography/*surgery
Female
Humans
Hyperparathyroidism, Primary/*complications/*surgery
Parathyroidectomy
Patella/*pathology/radiography
Tomography, X-Ray Computed

Figure

• 

  Fig. 1 31-year-old female suffered from right knee pain. A. Initial radiograph showed focal loss of radiodensity in right patella (arrows). B. On axial slice of CT-multiplanar reconstruction (MPR) image, disruptions of cortex around osteolytic lesions were seen in right patella. C. Axial T2-weighted MR image (repetition time/echo time = 4500/106 msec) showed mixed solid and multiloculated cystic nature of tumor in right patella. D. Mass lesion of parathyroid gland was observed by parathyroid scintigraphy (Tc-99m 2 methoxy-isobutyl-isonitrile) (arrow). E, F. One month after parathyroidectomy, bone formation and decrease in size of osteolytic lesion were observed in both radiographs (E) and CT-MPR images (F) in comparison to initial images (shown in A, B).

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