1/9. Bizarre parosteal osteochondromatous proliferation (Nora's lesion) of the foot.A 22-year-old man presented with a growing lump on the fifth metatarsal of the right foot. Radiographically, the lesion was a calcified mass stuck on to the bone. The T2-weighted magnetic resonance images showed heterogeneity in intensity. A tumor was suspected and an excisional biopsy was done. The lesion was composed of a cartilaginous cap and bone tissue. Histological examination revealed characteristic features of bizarre parosteal osteochondromatous proliferation (BPOP), such as hypercellularity, a blue tinctorial quality in the osteocartilaginous interfaces, and a scattering of binucleated or bizarre enlarged chondrocytes. Immunohistochemically, basic fibroblast growth factor was expressed in nearly all chondrocytes within the cartilaginous cap, while vascular endothelial growth factor was expressed only in enlarged chondrocytes near the osteocartilaginous interfaces. reverse transcription-polymerase chain reaction detected chondromodulin-I transcripts in the tissue of the cartilaginous cap. These findings indicate that the processes occurring in BPOP are similar to those occurring in endochondral ossification in the growth plate, and they support the concept that BPOP is a reparative process. BPOP is a rare tumorous lesion of the bone and is occasionally confused with other benign or malignant conditions. Thus, it is important to consider the clinical, radiographical and the gross histological features of the lesion when making a diagnosis.- - - - - - - - - - ranking = 1keywords = near (Clic here for more details about this article) |
2/9. Vascular compression caused by solitary osteochondroma: useful diagnostic methods of magnetic resonance angiography and Doppler ultrasonography.osteochondroma is a common benign bone tumor that sometimes causes vascular complications when the lesion is situated near the knee. Venous complications are seen less frequently. We report two cases of solitary osteochondroma that arose in the distal femur. The patients were an 11-year-old boy and a 16-year-old boy, both of whom were suffering from bone protuberance and lower leg swelling due to congestion. In both patients, magnetic resonance imaging (MRI) revealed dilated popliteal veins at a site distal from the tumors or superficial veins. MR angiography (MRA) showed compressed popliteal arteries, and Doppler ultrasonography revealed weaker blood flow in the dorsalis pedis arteries in the lower leg with the tumor than in the other lower leg. The former patient complained of pain due to swelling in the lower leg, and for this reason the patient underwent resection of the tumor. After resection, both the swelling and the pain were decreased, and Doppler ultrasonography also revealed normal blood flow in the artery. The latter patient had swelling, but no pain, in the lower leg, and accordingly this patient has been followed carefully without resection, since there is always the possibility of irreversible vascular damage caused by osteochondroma, such as arterial or venous occlusion. We present two patients with osteochondroma, both of whom suffered from swelling of the lower leg due to venous compression by the tumor. In both cases, MRI and MRA were useful to show the presence of vascular compression. Doppler ultrasonography could also reveal the blood flow disturbance objectively, even in current osteochondroma cases in which there were no arterial symptoms.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
3/9. Spontaneous resolution of solitary osteochondroma in the young adult.Spontaneous resolution of a solitary osteochondroma is rare. Such a case is presented in a patient nearing skeletal maturity. Based on a search of the English literature this is the first such report in a patient of this age.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
4/9. Costal osteochondroma presenting as haemothorax and diaphragmatic laceration.We report the unusual case of an 11-year-old girl who suffered a large haemothorax and lacerated left hemidiaphragm because of a costal osteochondroma arising from the left sixth rib near the costochondral junction. Surgical excision of the osteochondroma was performed and the lacerated diaphragm was repaired.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
5/9. Childhood peroneal neuropathy from bone tumors.Nontraumatic childhood peroneal mononeuropathy is uncommon and should initiate a search for surgically correctable causes. In 3 children, 2 age 12 years and 1 age 13 years, unilateral footdrop developed over a few days to a month. Electrodiagnostic findings demonstrated lesions with maximal or exclusive involvement of the deep peroneal nerve. Radiologically, bony exostoses were identified at or near the fibular head in each patient. In 2 patients, the lesions were clinically occult. An osteochondroma was removed from each patient and 2 patients had excellent clinical recoveries.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
6/9. Fracture through the stalk of pedunculated osteochondromas. A report of three cases.Although fracture through the base of an osteochondroma is a well-recognized clinical entity, the fate of such fractures has never been documented. Recommendations concerning the treatment of these fractures are contradictory. Of the three cases of fracture through the base of a pedunculated osteochondroma observed in the last 12 years, two healed without problem, one in a patient with a solitary osteochondroma, the other in a patient with multiple osteochondromas. The third patient remained symptomatic one year after injury, and histologic evaluation of the specimen after surgical excision confirmed the diagnosis of fibrous nonunion of the fracture. Experience with fractures through the base of a pedunculated osteochondroma suggests that the majority of these fractures will heal without complication, regardless of whether they involve solitary or multiple osteochondromas. However, symptomatic fibrous nonunion of such a fracture may occur particularly when an osteochondroma is located near large, mobile tendons.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
7/9. Soft tissue osteochondroma. A report of three cases.Three cases of benign soft tissue osteochondroma, a lesion of uncertain pathogenesis, are reported. Two cases were located in the subcutaneous tissues beneath the calcaneus. The other was located in the soft tissues near the left ankle joint. The diagnosis of soft tissue osteochondroma should be considered when a well-defined osseous mass is located in the soft tissues. The differential diagnosis includes myositis ossificans, tumoral calcinosis, synovial chondromatosis, and soft tissue osteosarcoma.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
8/9. osteochondroma of the scapula.Osteochondromas are common primary bone tumors which are usually located in the distal femur. In a large retrospective study from the Mayo clinic, osteochondromas comprised 36% of benign bone tumors and nearly 10% of all bone tumors. While the scapula is rarely involved, this is the most common tumor of the scapula. Clinical signs of this lesion include shoulder pain and limited range of motion. patients may present with winging of the scapula. Computed tomography is often necessary to fully define the location and character of the lesion. We present the case of a 14-year-old girl with pain and limited range of motion of the left shoulder. The diagnosis was that of osteochondroma of the scapula.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |
9/9. Solitary osteochondroma of the lumbar spine with cord compression: a case report.Solitary osteochondromas are usually of little significance. However, if they are located near neurologic structures, they may cause irritation due to compression. spinal cord compression is a rare but potentially catastrophic manifestation of solitary osteochondromas. As far as can be ascertained, a solitary osteochondroma in the lumbar region with spinal cord compression has not been reported in taiwan. This article includes the treatment of an 11-year-old girl with osteochondromas which was complicated by the late development of kyphoscoliosis and a review of the literature.- - - - - - - - - - ranking = 0.5keywords = near (Clic here for more details about this article) |