Periosteal chondroma of pelvis - an unusual location

Abstract

Periosteal chondroma is a slow growing benign tumor with prevalence rate of less than 2% of all chondromas. This tumor is mostly observed in clavicle, ribs and humerus and only one previous case has been reported in pelvis. Here we present an unusual case of periosteal chondroma due to uncommon presentation, location and age range. Our case is a 39 year-old male diagnosed with periosteal chondroma in pelvis. He had unspecific signs and symptoms overlapping with low back pain and disk herniation. By the time of admission he had gluteal muscle atrophy and also claudication. Differentiation of periosteal chondroma from other malignant tumors are pivotal in order to prevent aggressive and inappropriate therapies. He underwent surgical procedures and periosteal chondroma was ascertained by both radiological and Histopathological evidence. 6 months after surgery, he declared no pain, he was able to walk freely. He claimed partial paresthesia but he also declared that his paresthesia has ameliorated.

Keywords: Periosteal chondroma; case report; low back pain; pelvis.

Figure 1

PXR of the patient 2 weeks before admission.

Figure 2

Initial MRI of the patient suspicious to PVNS.

Figure 3

Lytic sclerotic bony lesion adjacent to superoposterior aspect of the right acetabulum indicated in the CT scan.

Figure 4

Tumor extraction surgery and extracted lesions.

Figure 5

Histopathological studies of the tumor indicating a well-differentiated area of compact mature lamellar bone similar to cortical bone by hematoxylin-eosin [H&E] staining. (A: Magnification ×10, B: Magnification ×40).

Figure 6

Post operation PXR was performed 6 months after surgery.