MedGen

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in virtually all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to and usually several centimeters above the 98th centile. Initial mental and motor development is normal in most individuals. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Almost all individuals have epilepsy from an early age. The epilepsy is typically well controlled with anti-seizure medication, but status epilepticus occurs relatively frequently. Mental deterioration is late and mild. Disease severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their fifties. An improving phenotype has a similar initial presentation with delayed mental or motor development, followed by an improving clinical course: macrocephaly usually persists, but some children become normocephalic; motor function improves or normalizes; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable, with or without autism. Epilepsy and status epilepticus may occur. [from GeneReviews]

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in virtually all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to and usually several centimeters above the 98th centile. Initial mental and motor development is normal in most individuals. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Almost all individuals have epilepsy from an early age. The epilepsy is typically well controlled with anti-seizure medication, but status epilepticus occurs relatively frequently. Mental deterioration is late and mild. Disease severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their fifties. An improving phenotype has a similar initial presentation with delayed mental or motor development, followed by an improving clinical course: macrocephaly usually persists, but some children become normocephalic; motor function improves or normalizes; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable, with or without autism. Epilepsy and status epilepticus may occur. [from GeneReviews]

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in virtually all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to and usually several centimeters above the 98th centile. Initial mental and motor development is normal in most individuals. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Almost all individuals have epilepsy from an early age. The epilepsy is typically well controlled with anti-seizure medication, but status epilepticus occurs relatively frequently. Mental deterioration is late and mild. Disease severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their fifties. An improving phenotype has a similar initial presentation with delayed mental or motor development, followed by an improving clinical course: macrocephaly usually persists, but some children become normocephalic; motor function improves or normalizes; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable, with or without autism. Epilepsy and status epilepticus may occur. [from GeneReviews]

The classic phenotype of megalencephalic leukoencephalopathy with subcortical cysts (MLC) is characterized by early-onset macrocephaly, often in combination with mild gross motor developmental delay and seizures; gradual onset of ataxia, spasticity, and sometimes extrapyramidal findings; and usually late onset of mild mental deterioration. Macrocephaly, observed in virtually all individuals, may be present at birth but more frequently develops during the first year of life. The degree of macrocephaly is variable and can be as great as 4 to 6 SD above the mean in some individuals. After the first year of life, head growth rate normalizes and growth follows a line parallel to and usually several centimeters above the 98th centile. Initial mental and motor development is normal in most individuals. Walking is often unstable, followed by ataxia of the trunk and extremities, then minor signs of pyramidal dysfunction and brisk deep-tendon stretch reflexes. Almost all individuals have epilepsy from an early age. The epilepsy is typically well controlled with anti-seizure medication, but status epilepticus occurs relatively frequently. Mental deterioration is late and mild. Disease severity ranges from independent walking for a few years only to independent walking in the fifth decade. Some individuals have died in their teens or twenties; others are alive in their fifties. An improving phenotype has a similar initial presentation with delayed mental or motor development, followed by an improving clinical course: macrocephaly usually persists, but some children become normocephalic; motor function improves or normalizes; hypotonia and clumsiness may persist in some or neurologic examination may become normal. Some have intellectual disability that is stable, with or without autism. Epilepsy and status epilepticus may occur. [from GeneReviews]

A condition in which the helix is folded over to a greater degree than normal. That is, excessive curling of the helix edge, whereby the free edge is parallel to the plane of the ear. [from HPO]

Absence of the usual parallel position of philtral ridges. [from HPO]

The upper incisors deviate from the normal angle of being roughly parallel to the surface of the face and instead slant outwards. [from HPO]

Increased length of the arm span (length from one end of an individual's arms measured at the fingertips to the other when raised parallel to the ground at shoulder height at a one-hundred eighty degree angle). [from HPO]

If the two laminae of the septum pellucidum are not fused then a fluid-filled space or cavum is present. The cavum septum pellucidum is present at birth but usually obliterates by the age of 3 to 6 months. It is up to 1cm in width and the walls are parallel. It is an enclosed space and is not part of the ventricular system or connected with the subarachnoid space. [from HPO]

A type of acellular urinary cast that are composed only of Tamm-Horsfall glycoprotein, a fact which explains their low refractive index. Hyaline casts may display a spectrum of morphologies, which includes fluffy, compact, convoluted or wrinkled casts. Hyaline casts have a smooth texture and usually have parallel sides with clear margins and blunted ends. [from HPO]

Astigmatism (from the Greek 'a' meaning absence and 'stigma' meaning point) is a condition in which the parallel rays of light entering the eye through the refractive media are not focused on a single point. Both corneal and noncorneal factors contribute to refractive astigmatism. Corneal astigmatism is mainly the result of an aspheric anterior surface of the cornea, which can be measured readily by means of a keratometer; in a small fraction of cases (approximately 1 in 10) the effect is neutralized by the back surface. The curvature of the back surface of the cornea is not considered in most studies, because it is more difficult to measure; moreover, in the case of severe corneal astigmatism, there is evidence that both surfaces have the same configuration. Noncorneal factors are errors in the curvature of the 2 surfaces of the crystalline lens, irregularity in the refractive index of the lens, and an eccentric lens position. Since the cornea is the dominant component of the eye's refracting system, a highly astigmatic cornea is likely to result in a similarly astigmatic ocular refraction (summary by Clementi et al., 1998). [from OMIM]

Thinned, erythematous, depressed bands of atrophic skin. Initially, striae appear as flattened and thinned, pinkish linear regions of the skin. Striae tend to enlarge in length and become reddish or purplish. Later, striae tend to appear as white, depressed bands that are parallel to the lines of skin tension. Striae distensae occur most often in areas that have been subject to distension such as the lower back, buttocks, thighs, breast, abdomen, and shoulders. [from HPO]

A rare non-syndromic syndactyly characterized by unilateral or bilateral fusion of the 4th and 5th metacarpals with no other associated abnormalities. Patients present shortened 4th and 5th metacarpals with excessive separation between their distal ends, resulting in marked ulnar deviation of the little finger and an inability to bring the 5th finger in parallel with the other fingers. [from ORDO]

The common blue nevus of Jadassohn-Tieche most frequently presents as a solitary blue 1- to 10-mm dome-shaped papule on the dorsal hand or foot. It is characterized by greatly elongated wavy groups of spindled dermal melanocytes that are oriented parallel to the epidermis. Cellular blue nevi resemble common blue nevi clinically but are usually larger, ranging from 1 to 3 cm in diameter, and occur primarily on the buttocks or sacrum as a solitary blue nodule (summary by Knoell et al., 1998). [from OMIM]

Erythema palmare hereditarium is a benign condition that was first described by Lane (1929). Erythema usually presents at birth and remains stable throughout life. Histology shows dilated vessels in the entire dermis with inflammatory infiltrate. Capillaroscopy reveals an increased number of capillary loops running parallel to the surface (summary by Kluger and Guillot, 2010). [from OMIM]

A rare, acquired, dermis elastic tissue disease characterized by asymptomatic, well-demarcated, symmetric patches and/or plaques of finely wrinkled skin arranged parallel to skin cleavage lines (type I), associated with perifollicular papular protrusions (type II) or with persistent reticular erythema (type III), occurring predominantly on the shoulders, trunk, back, and proximal extremities, associating, on histopathology, a selective loss of elastic tissue in the midreticular dermis. Erythema and/or urticaria may or may not precede wrinkly lesions. [from ORDO]

A type of angiokeratoma that most commonly occurs on the scrotum of patients who are 40 years old or older. The typical single lesion is a dark red to blue dome-shaped papule 2-4 mm in diameter with a very discrete keratotic surface. Typically, they are multiple and arranged in a line parallel to the raphe mediana of the scrotum. They also occur on the vulva and less commnly on the penis. [from HPO]

Pili bifurcati is an uncommon transitory hair shaft dysplasia with characteristic of segmental duplication of the hair shaft. Patients generally present with diffuse alopecia. Hypopigmentation can be observed. This anomaly of the hair shaft occurs in normal hair, pili canaliculi, or monilethrix and has been associated with the mosaic trisomy 8 syndrome, pseudomonilethrix type II or protein deficiency states. It can also be secondary to ulcerative colitis and extensive bowel resection. Caused by a transient duplication of the papilla''s tip during the anagen phase, leading to the transitory production a two complete shafts, in the same follicular matrix, that emerge through a single pilary canal. When the two papilla tips fuse, both parallel branches form a single shaft again. When the transient duplication of the papilla tip occurs repetitively during the anagen phase, a series of bifurcation-fusion can be observed along the shaft. This situation is called pili multi-bifurcati. As a duplicated papilla tip can split again, a doubly bifurcated shaft may be observed: pili bi-bifurcati. [from SNOMEDCT_US]

An anomalous trapezoidal appearance of a vertebral body. A trapezoid is a four-sided shape that has two sides that are parallel and two sides that are not parallel. In this case, the two lateral sides of the vertebra are parallel, and the top and the bottom are slanted with respect to each other such that the vertebra is shorter in the front or back than on the other side. [from HPO]

A rare, benign, superficial fibromatosis disease characterized by single or multiple, uni- or bilateral, fixed, slow-growing, round, firm nodules typically located on the medial portion of the plantar aponeurosis, with no calcification. Patients are often asymptomatic or may present with foot pain, difficulty to walk or stand and, rarely, toe contractures. Histopathology reveals dense fibrocellular tissue with parallel and nodular arrays of fibrocytes and fibrillar collagen with a distinctive cork-screw morphology and no atypia. [from ORDO]