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Frontal bossing is the development of an unusually pronounced forehead which may also be associated with a heavier than normal brow ridge. It is caused by enlargement of the frontal bone , often in conjunction with abnormal enlargement of other facial bones , skull , mandible , and bones of the hands and feet.
Compensatory growth occurs forward at the coronal suture and backward at the lambdoid suture giving respectively a prominent forehead, called frontal bossing, and a prominent back portion of the head, called coning. [10] [11] This is the most common form of craniosynostosis. [13]
Paget's disease affecting the skull may cause frontal bossing, increased hat size, and headaches. Often patients may develop loss of hearing in one or both ears [ 7 ] due to auditory foramen narrowing and resultant compression of the nerves in the inner ear.
The GM1 gangliosidoses, usually shortened to GM1, are gangliosidoses caused by mutation in the GLB1 gene resulting in a deficiency of beta-galactosidase.The deficiency causes abnormal storage of acidic lipid materials in cells of the central and peripheral nervous systems, but particularly in the nerve cells, resulting in progressive neurodegeneration.
Cranial sutures. A defining characteristic of Crouzon syndrome is craniosynostosis, which results in an abnormal head shape.This is present in combinations of: frontal bossing, trigonocephaly (fusion of the metopic suture), brachycephaly (fusion of the coronal suture), dolichocephaly (fusion of the sagittal suture), plagiocephaly (unilateral premature closure of lambdoid and coronal sutures ...
Morphological facial changes caused by acromegaly; frontal bossing, enlarged nose, prognathism and maxillary widening with separation of teeth and unseen, enlargement of the tongue, stuffy nose (macroglossia) Acromegaly is a syndrome that results when the anterior pituitary gland produces excess growth hormone (GH).
Distinct faces: Frontal and temporoparietal bossing, hypertelorism, mandibular prognathism, cleft lip or palate, and macrocephaly. [8] Bilateral ovarian fibromas; 10% develop cardiac fibromas; ocular abnormalities: cataracts, coloboma, microphthalmia. [8] meningiomas [8]
Pronounced brow protrusion, often with ocular distension (frontal bossing) Pronounced lower jaw protrusion (prognathism) with attendant macroglossia (enlargement of the tongue) and teeth spacing; Hypertrichosis, hyperpigmentation and hyperhidrosis may occur in these people. [10]: 499 Skin tags; Carpal tunnel syndrome