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n. pl. per·i·os·te·a (-tē-ə)
The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons.

[New Latin, from Late Latin periosteon, from Greek, from periosteos, around the bone : peri-, peri- + osteon, bone; see ost- in Indo-European roots.]

per′i·os′te·al (-tē-əl), per′i·os′te·ous (-tē-əs) adj.
References in periodicals archive ?
The principal features of PDP include clubbing of the digits, periosteal new bone formation, furrows and coarse facial features, and cutis verticis gyrata.
To obtain the cross-sectional cortical bone region, a periosteal contour was first segmented by delineating mineralized bone and extra-osseal soft tissue.
El condrosarcoma (CS) es la segunda neoplasia maligna primaria de hueso, despues del osteosarcoma, y se clasifica en primario central, primario periosteal y secundario (1-3).
The inferior pedicled soft-tissue periosteal flap was harvested for the reconstruction of the external auditory contour, and canaloplasty was performed with the obliterating flap in the cholesteatoma cavity.
Four weeks later, he developed extensive lytic lesion of proximal femur metaphysis with onion skin periosteal reaction in diaphysis in spite of intravenous antibiotics.
Radiographs of the right foot demonstrated soft tissue swelling and a smoothly marginated periosteal reaction evident of inflammation affecting the bones.
The following radiographic changes were estimated for each ROI: (1) osteolysis, (2) soft tissue swelling, (3) periosteal reaction, (4) general impression and (5) deformity.
An MRI scan of the right thigh, however, revealed extensive periosteal and bone marrow edema, multilocular small periosteal-based fluid-collections throughout the femoral shaft, and extensive edematous changes in the soft tissues of the thigh, predominantly in the vastus medialis and biceps femoris muscles (Figure 1).
Periosteal reaction is response of cortical bone to various aetiologies such as; trauma, infection, tumour, drugs and arthritic conditions which can cause periosteal elevation from cortex resulting in various patterns of periosteal reaction7.
1) It is an uncommon subset of psoriatic arthritis that is characterized by psoriatic onychodystrophy, onycholysis, connective tissue thickening above the distal phalanx as well as specific radiologic changes such as periosteal reaction and bone erosions of the distal phalanges.
1) The age of the patient, location of the lesion, relationship to the tooth and adjacent structures, margins of the lesion, internal characteristics such as the pattern of mineralization, periosteal reaction, associated soft tissue changes and relevant clinical details, all help to narrow the differential diagnosis.