bizarre parosteale osteochondromatöse Proliferation

Bizarre

parosteal osteochondromatous proliferation co-occurring with a metatarsal fatigue fracture: a case report. Plain X-rays of the right foot showing the lesion on the neck of the third metatarsal, with narrowing of the medullary cavity, with no visible fracture line

bmcmusculoskeletdisord.biomedcentral.com • CC-by-4.0

Bizarre

parosteal osteochondromatous proliferation co-occurring with a metatarsal fatigue fracture: a case report. CT imaging of the right foot showing the continuity of the lesion with the cortex and interruption of bone continuity

bmcmusculoskeletdisord.biomedcentral.com • CC-by-4.0

Bizarre

parosteal osteochondromatous proliferation co-occurring with a metatarsal fatigue fracture: a case report. Bone scintigraphy showing increased tracer uptake in the neck of the third metatarsal on the right foot

bmcmusculoskeletdisord.biomedcentral.com • CC-by-4.0

Bizarre

parosteal osteochondromatous proliferation in the lingual area of the mandibular body versus osteochondroma at the mandibular condyle. Radiographic views of this study. A Computed tomography of BPOP, an irregularly calcified mass located on the lingual side of the mandibular body without cortical attachment (arrows). A1 Frontal plane. A2 Horizontal plane. B Panoramic view of osteochondroma, enlarged left condylar head (arrows)

wjso.biomedcentral.com • CC-by-4.0

Bizarre

parosteal osteochondromatous proliferation (Nora’s lesion) affecting the distal end of the ulna: a case report. AP radiographic findings. a The first AP radiograph shows calcifications within the distal radioulnar joint (DRUJ). b The preoperative AP radiograph shows a bony prominence arising from the distal end of the ulna. c At follow-up 2 years after surgery. The AP radiograph indicates that there has been no recurrence of the lesion

bmcmusculoskeletdisord.biomedcentral.com • CC-by-4.0

Bizarre

parosteal osteochondromatous proliferation (Nora’s lesion) affecting the distal end of the ulna: a case report. CT and MRI findings. a The CT scan shows a pedunculated bony prominence arising from the distal end of the ulna that has no continuity with the medullary cavity (arrow). b A axial T1-weighted MRI image that shows a low signal intensity at the margins of the lesion (asterisk). c A T2-weighted image that shows a high signal intensity at the margins of the lesion (asterisk). d A gadolinium-enhanced image shows a low signal intensity at the margins of the lesion (asterisk)

bmcmusculoskeletdisord.biomedcentral.com • CC-by-4.0

Lesions

involving the outer surface of the bone in children: a pictorial review. A 5-year-old boy with bizarre parosteal osteochondromatous proliferation at the middle phalanx of the right index finger. Antero-posterior radiograph of the right index finger a demonstrates a well-defined mass with amorphous calcifications (arrow) adjacent to the otherwise intact cortical surface of the middle phalanx. No medullary continuity is demonstrated between the lesion and underlying bone. Axial T1 post-contrast image b shows irregular peripheral contrast enhancement of the lesion without surrounding soft-tissue invasion (arrow). The lesion is hypointense on coronal T1 c and mostly hyperintense with few hypointense foci on axial T2 d (black arrow)

insightsimaging.springeropen.com • Open Access

Bizarre

parosteal osteochondromatous proliferation • Bizarre parosteal osteochondromatous proliferation - Ganzer Fall bei Radiopaedia

Danaher, L. Bizarre parosteal osteochondromatous proliferation. Case study, Radiopaedia.org. (accessed on 21 Oct 2022) https://doi.org/10.53347/rID-29682 • CC by-nc-sa 3.0 (modified)

Bizarre

parosteal osteochondromatous proliferation • Bizarre parosteal osteochondromatous proliferation (Nora lesion) - Ganzer Fall bei Radiopaedia

Skalski, M. Bizarre parosteal osteochondromatous proliferation (Nora lesion). Case study, Radiopaedia.org. (accessed on 21 Oct 2022) https://doi.org/10.53347/rID-30785 • CC by-nc-sa 3.0 (modified)

Bizarre

parosteal osteochondromatous proliferation • Bizarre parosteal osteochondromatous proliferation - Ganzer Fall bei Radiopaedia

Saber, M. Bizarre parosteal osteochondromatous proliferation. Case study, Radiopaedia.org. (accessed on 21 Oct 2022) https://doi.org/10.53347/rID-84221 • CC by-nc-sa 3.0 (modified)

Bizarre

parosteal osteochondromatous proliferation • Bizarre parosteal osteochondromatous proliferation (Nora lesion) - Ganzer Fall bei Radiopaedia

Nicoletti, D. Bizarre parosteal osteochondromatous proliferation (Nora lesion). Case study, Radiopaedia.org. (accessed on 21 Oct 2022) https://doi.org/10.53347/rID-146732 • CC by-nc-sa 3.0 (modified)

Bizarre

parosteal osteochondromatous proliferation • Bizarre parosteal osteochondromatous proliferation (BPOP): Nora lesion - Ganzer Fall bei Radiopaedia

Nicoletti D, Bizarre parosteal osteochondromatous proliferation (BPOP): Nora lesion. Case study, Radiopaedia.org (Accessed on 11 Apr 2023) https://doi.org/10.53347/rID-158679 • CC by-nc-sa 3.0 (modified)

Bizarre

parosteal osteochondromatous proliferation • Bizarre parosteal osteochondromatous proliferation (BPOP) - Nora lesion - Ganzer Fall bei Radiopaedia

Ranchod A, Bizarre parosteal osteochondromatous proliferation (BPOP) - Nora lesion. Case study, Radiopaedia.org (Accessed on 11 Apr 2023) https://doi.org/10.53347/rID-165558 • CC by-nc-sa 3.0 (modified)

Radiopaedia • CC-by-nc-sa 3.0 • de

Bizarre parosteal osteochondromatous proliferations (BPOP), also known as Nora lesions, are benign exophytic osteochondral lesions which have an appearance similar to an osteochondroma and are typically seen in the hands and feet. On imaging, BPOPs are shown to be continuous with the underlying cortex, but usually without continuation of the medulla.

Epidemiology

They are most often seen in young (20-30-year-old) patients. There is no recognized gender predilection.

Radiographic features

Plain radiograph

Typically seen as a well-marginated wide-based bony growth projecting into the soft tissues although often lacks the characteristic orientation away from the nearby physis seen with osteochondromas. The mineralizing exophytic lesion arises from the cortical bone with or without osteolysis, cortical flaring or a periosteal reaction. A lack of medullary involvement is characteristic of bizarre parosteal osteochondromatous proliferation, although radiographic features alone cannot reliably diagnose the lesion.

Treatment and prognosis

Bizarre parosteal osteochondromatous proliferations are benign lesions with no risk of distant metastasis but they may show marked local invasion and may recur after surgical excision.

History and etymology

Frederick E Nora (fl. 2020) is an American pathologist who first described bizarre parosteal osteochondromatous proliferations whilst working at the Mayo Clinic in 1983 .