[Segmental dysplasia & aplasia of the occipital bone].
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Bone Diseases↗
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Results for “OCCIPITAL BONE”
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Giant intradiploic epidermoid tumor of the occipital bone: case report.
The authors describe a case of a giant intradiploic epidermoid cyst of the occipital bone with an intracranial extension in the posterior fossa and no signs of neurological involvement. The lesion started as a painless lump under the scalp. Roentgenographic and computed tomographic findings led to a correct diagnosis, and the complete removal of the cyst was accomplished, despite its large size. The total removal of these cysts is associated with a good prognosis.
Bone Cysts↗
Three-dimensional reconstruction of melanotic neuroectodermal tumor of infancy involving the occipital bone and dura.
A rare case of melanotic neuroectodermal tumor of infancy involving the right occipital bone in an 11-month-old infant is described. The bone tumor and its dural extension were surgically removed. Three-dimensional reconstruction of the tumor and brain from neuroimaging data added worthwhile information for preoperative planning. Microscopic examination revealed melanotic and neuroblastic tissue in a fibrillary matrix involving the expanded bone and superficial dura. A focal osteoblastic cranial mass in an infant should alert the clinician to consider this tumor.
Brain↗
Development of ossification centres in the squamous portion of the occipital bone in man.
The development of ossification centres in the squamous portion of the human occipital bone is described on the basis of anomalies observed in a large series of skulls. The interparietal part develops from three pairs of centres in membrane--one pair for the lateral plates, one pair for the central piece, and the third pair representing the pre-interparietals. The supraoccipital part develops from five centres in cartilage--two centres for each lateral segment and a single centre for the central segment. The supraoccipital part extends from the posterior margin of the posterior condylar fossae to about 2 cm above the external occipital protuberance and about 0.4 cm above the superior nuchal line near the lambdoid suture.
Cartilage↗
Primary hemangioma of the occipital bone in the region of the torcula--two case reports.
Two rare cases of subtorcular occipital bone hemangioma occurred in 26-year-old and 30-year-old female patients. Partial resection was performed in both cases because of the proximity to the torcula. No recurrence was seen at follow-up examination at 9 and 12 months.
Adult↗
Post-traumatic intra-osseous pseudomeningocele of the occipital bone.
Clinical, radiographic, and operative findings in two children with intra-osseous pseudomeningocele of the occipital bone due to cranial trauma are presented here, along with a literature review of this uncommon radiologic entity.
Adolescent↗
Benign chondroblastoma of the occipital bone.
We report the case of a 14-year-old boy with benign chondroblastoma in the occipital bone associated with a cerebellar hemorrhage. The clinical features, radiologic and histologic appearances, and histogenesis in this case are described. Other reports of benign chondroblastomas of the cranial bones are also discussed.
Adolescent↗
[Laryngeal carcinoma distant metastasis to the occipital bone: a case report].
The authors present a case of laryngeal carcinoma with rare metastasis to the occipital bone.
Carcinoma, Squamous Cell↗
Solitary plasmacytomas of the occipital bone: a report of two cases.
The radiological appearances of two cases of solitary plasmacytoma in the occipital bone are described. One arose in the lateral part and the other in the squama. They showed characteristic radiological features on CT, MRI and angiography. Bone scintigraphy and gallium scintigraphy were also available. Solitary plasmacytoma of the skull is a rare condition and usually occurs in the calvarium. The skull base is an extremely rare site and only four cases have been reported. The literature of solitary plasmacytoma of the skull is reviewed.
Aged↗
[Lacunae of the occipital bone. Radiological aspects of normal anatomical variants].
Sixteen patients with lacunar alterations of the squamous occipital bone were studied in various radiographic projections; in many cases tomography and technetium 99m bone scan studies were also performed. In 7 cases lacunae in the cerebral fossa were observed, with an average diameter of 3 cm. These defects were due to a thinning of the inner table of the theca. In 9 cases smaller lacunae were demonstrated bilaterally, which were more radiolucent, isolated or confluent, located in the area corresponding to the internal occipital protuberance at the ridges of the cruciform eminence. The latter were representative of diploic venous lakes, as best demonstrated in lateral projection. This kind of lacunae are considered as anatomic variants, because no bone destruction is demonstrable, as confirmed by technetium scintigraphy.
Adult↗
Sexual dimorphism in the basilar part of the occipital bone of the dog (Canis familiaris).
Sexual dimorphism in the surface markings of the basilar part of the occipital bone of 34 male and 46 female dog's skulls were studied with the following results: 1 of the 34 male skulls showed a female type surface marking, 4 of the 46 female skulls showed surface markings of the opposite sex, while 2 of the male and 3 of the female skulls could not be classified as belonging to either type, so that 10 out of the 80 skulls could not be identified correctly, indicating that 87.5% of the skulls could be identified positively. Considering that there are hardly any sexual differences in the other surface markings or in the dentition of the dog's skull, these findings may be of some help in sexing the skull of the dog.
Animals↗
[A case of giant osteoma in the occipital bone].
A 51-year-old female patient, admitted with a chief complaint of dizziness, had bulging of the occipital area, which had started insidiously. On admission, a bony hard swelling with a smooth surface was noted in the left occipital region, extending over the midline of the skull. Plain X ray films revealed a uniform shadow of an osteoid mass inside the occipital bone. A tomogram indicated that the mass originated in the diploë or outer table of the skull, although there was no evidence of destruction of the inner table. CT scan revealed mixed density mass with high density of bone and an irregularly shaped low density area. In the T1-weighted images of MRI, the entire mass showed a low intensity, while in the T2-weighted image the mass showed 3 areas with different intensities. Bone scintigraphy was performed with 99mTc-MDP and revealed an image of accumulation in the mass. Carotid and vertebral angiograms were negative for evidence of feeding arteries to the mass, for tumor stain, and for occlusion of either sigmoid sinus or transverse sinus. The mass was diagnosed as a giant osteoma, and was totally removed. The excised tumor measured 10 x 9 x 5 cm, and inspection at operation revealed it to be composed of a fragile osteoid portion and a comparatively soft connective tissue portion. The histological diagnosis of the mass was that it was a spongy osteoma including a comparatively large amount of connective tissue. The postoperative recovery of the patient was satisfactory and her dizziness disappeared.(ABSTRACT TRUNCATED AT 250 WORDS)
Female↗
Time of fusion of the basisphenoid with the basilar part of the occipital bone in northwest Indian subjects.
To find out the time of fusion of the basisphenoid with the basilar part of the occipital bone in Northwest Indian subjects, a quadrilateral piece of bone extending from the posterior clinoid processes to the jugular tubercles was removed from 50 male and 34 female autopsy subjects between the ages of 10 and 20 years. The piece of bone was X-rayed and then macerated. In addition CT scan cuts of the basisphenoid were obtained in 46 male and 27 female living subjects between the age of 10 and 19 years. In the males, partial fusion was seen at 13 years while a complete fusion was noticed at 15 years in 25% of the subjects. The age of a boy showing complete fusion should be 15 years or above. If there is no fusion or partial fusion he should be below 19 years as complete fusion is seen in all male subjects at 19 years. In females, the earliest partial fusion was noted at 12 years and complete fusion was present at 13 years in 16.6%. All female subjects showed complete fusion at 17 years. The minimum age of a girl showing complete fusion should be 13 years; if no fusion or partial fusion is seen, her age should be below 17 years.
Adolescent↗
Osteoclastoma of occipital bone.
Osteoclastoma of the calvarial bone of membranous origin is a rare entity. This paper presents a case of osteoclastoma of the occipital bone and a brief review of literature.
Child↗
Ewing's sarcoma in the occipital bone. Case report.
The head is a very rare primary site for Ewing's sarcoma which occurs most often in the long bones of the extremities and in the pelvis. This report describes an unusual case of Ewing's sarcoma arising from the occipital bone in a seven year old girl. The tumour compressed the venous sinuses, thus lowering the intracranial pressure resulted in temporary recovery which made the diagnosis difficult.
Bone Neoplasms↗
A rare anomaly of 5 ossicles in the pre-interparietal part of the squamous occipital bone in north Indians.
Examination of 125 adult north Indian skulls revealed a rare anomaly of 5 large ossicles in the upper central part of the squamous occipital bone. Their location and possible derivation are briefly discussed.
Asian People↗
Chondromyxoid fibroma of the occipital bone.
Chondromyxoid fibroma is an uncommon bone tumour, found predominantly in the metaphyses of the long bones of the lower limbs. The authors describe a patient in whom the tumour arose from the occipital bone. To the authors' knowledge, this is only the second report of chondromyxoid fibroma occurring in this location.
Adult↗
Ossification sequence of occipital bone and vertebrae in human fetuses.
The aim of this radiographic study of human fetuses was to examine the pattern and sequence of ossification in the occipital bone and the spinal vertebrae. Together with previous studies of ossification of the human fetal basal cranium, this study can serve as a reference for normalcy in future studies of fetuses with neural tube defects and associated pathological development of the axial skeleton. Thirty-nine normal fetuses aborted between 9 and 14 weeks of gestation were examined. Based on the appearance of ossification centers in the bones under study, the fetuses could be grouped in four well-defined developmental stages, which were named occipito-spinal stages I-IV (OS I-IV). The OS stage was closely related to gestational age, crown-rump length, foot length, and degree of ossification in the hands and feet.
Embryonic and Fetal Development↗