MedGen

Cleft between the helix and the lobe. [from HPO]

Question mark ears (QME) is an auricular abnormality characterized by a cleft between the lobule and the lower part of the helix, sometimes accompanied by a prominent or deficient upper part of the helix, shallow skin dimple on the posterior surface of the ear, or transposition of the ear lobe/antitragus. It is more prevalent among boys than girls (2:1), usually sporadic, and can be unilateral or bilateral (Shkalim et al., 2008). [from OMIM]

Auriculocondylar syndrome-1 (ARCND1) is an autosomal dominant disorder of the first and second pharyngeal arches and is characterized by malformed ears (question mark ears), prominent cheeks, microstomia, abnormal temporomandibular joint, and mandibular condyle hypoplasia (summary by Masotti et al., 2008). Genetic Heterogeneity of Auriculocondylar Syndrome See also ARCND2A (614669), caused by heterozygous mutation in the PLCB4 gene (600810) on chromosome 20p12.3-p12.2; ARCND2B (620458), caused by biallelic mutation in the PLCB4 gene; ARCND3 (615706), caused by mutation in the EDN1 gene (131240) on chromosome 6p24; and ARCND4 (620457), caused by mutation the HDAC9 gene (606543) on chromosome 7p21. See also 612798 for isolated question mark ears. Reviews Kokitsu-Nakata et al. (2012) tabulated clinical findings in 24 reported cases of auriculocondylar syndrome. The most common clinical signs observed were ear constriction (100%), abnormal temporomandibular joint (100%), mandibular condyle abnormality (93%), malocclusion (93%), round face (78%), microstomia (78%), micrognathia (78%), prominent cheeks (74%), hearing loss (56%), abnormal palate (55%), and crowded teeth (50%). The authors noted that the phenotype was highly variable in severity, even within families. Liu et al. (2021) reviewed 19 published cases of ARCND1 and tabulated the common features, including micrognathia (79%), auricular malformation (68%), microstomia (67%), prominent cheeks (63%), mandibular hypoplasia (58%), and round face (58%). Asymmetry of mandibular and auricular malformations was present in 4 patients, and the lesions were either more severe on the right or only the right side was affected, suggesting a predilection for right-sided deformities. The authors also noted that severe cases mostly occurred in female patients. Prenatal findings were available in 3 patients, and all showed polyhydramnios, with 2 having micrognathia evident on ultrasonography. The authors suggested that severe micrognathia and mandibular hypoplasia accompanied by polyhydramnios might be prenatal indicators of ARCND. Using a standardized questionnaire sent to referring physicians, Vegas et al. (2022) collected clinical data on 39 patients from 27 families with auriculocondylar syndrome and mutation in the GNAI3, PLCB4, or EDN1 genes. PLCB4 was the most common gene associated with ARCND, being mutated in 16 (59%) of the 27 families. Incomplete penetrance and/or variable expression was observed within families. [from OMIM]

Auriculocondylar syndrome (ARCND), also known as 'question-mark ear syndrome' or 'dysgnathia complex,' is a craniofacial malformation syndrome characterized by highly variable mandibular anomalies, including mild to severe micrognathia, often with temporomandibular joint ankylosis, cleft palate, and a distinctive ear malformation that consists of separation of the lobule from the external ear, giving the appearance of a question mark. Other frequently described features include prominent cheeks, cupped and posteriorly rotated ears, preauricular tags, and microstomia (summary by Rieder et al., 2012). For a discussion of genetic heterogeneity of auriculocondylar syndrome, see ARCND1 (602483). [from OMIM]

An irregularly shaped, elevated mark on the skin caused by deposits of excessive amounts of collagen during wound healing. It extends beyond the original boundaries of the wound and may enlarge progressively. [from NCI]

Auriculocondylar syndrome (ARCND) is a rare craniofacial disorder involving first and second pharyngeal arch derivatives and includes the key features of micrognathia, temporomandibular joint and condyle anomalies, microstomia, prominent cheeks, and question mark ears (QMEs). QMEs consist of a defect between the lobe and the upper two-thirds of the pinna, ranging from a mild indentation in the helix to a complete cleft between the lobe and helix (summary by Gordon et al., 2013). For a general phenotypic description and discussion of genetic heterogeneity of auriculocondylar syndrome, see ARCND1 (602483). [from OMIM]

Features that occur less commonly in people with TRNT1 deficiency include hearing loss caused by abnormalities of the inner ear (sensorineural hearing loss), recurrent seizures (epilepsy), and problems with the kidneys or heart.

Neurological problems are also frequent in TRNT1 deficiency. Many affected individuals have delayed development of speech and motor skills, such as sitting, standing, and walking, and some have low muscle tone (hypotonia).

Eye abnormalities, often involving the light-sensing tissue at the back of the eye (the retina), can occur in people with TRNT1 deficiency. Some of these individuals have a condition called retinitis pigmentosa, in which the light-sensing cells of the retina gradually deteriorate. Eye problems in TRNT1 deficiency can lead to vision loss.

In addition, many individuals with TRNT1 deficiency have recurrent fevers that are not caused by an infection. These fever episodes are often one of the earliest recognized symptoms of TRNT1 deficiency, usually beginning in infancy. The fever episodes are typically accompanied by poor feeding, vomiting, and diarrhea, and can lead to hospitalization. In many affected individuals, the episodes occur regularly, arising approximately every 2 to 4 weeks and lasting 5 to 7 days, although the frequency can decrease with age.

Many people with TRNT1 deficiency have an immune system disorder (immunodeficiency) that can lead to recurrent bacterial infections. Repeated infections can cause life-threatening damage to internal organs. The immunodeficiency is characterized by low numbers of immune system cells called B cells, which normally help fight infections by producing immune proteins called antibodies (or immunoglobulins). These proteins target foreign invaders such as bacteria and viruses and mark them for destruction. In many individuals with TRNT1 deficiency, the amount of immunoglobulins is also low (hypogammaglobulinemia).

A common feature of TRNT1 deficiency is a blood condition called sideroblastic anemia, which is characterized by a shortage of red blood cells (anemia). In TRNT1 deficiency, the red blood cells that are present are unusually small (erythrocytic microcytosis). In addition, developing red blood cells in the bone marrow (erythroblasts) can have an abnormal buildup of iron that appears as a ring of blue staining in the cell after treatment in the lab with certain dyes. These abnormal cells are called ring sideroblasts.

TRNT1 deficiency encompasses what was first thought to be two separate disorders, a severe disorder called sideroblastic anemia with B-cell immunodeficiency, periodic fevers, and developmental delay (SIFD) and a milder disorder called retinitis pigmentosa with erythrocytic microcytosis (RPEM), each named for its most common features. SIFD begins in infancy, and affected individuals usually do not survive past childhood. RPEM, on the other hand, is recognized in early adulthood, and the microcytosis usually does not cause any health problems. However, it has since been recognized that some individuals have a combination of features that fall between these two ends of the severity spectrum. All of these cases are now considered part of TRNT1 deficiency.

TRNT1 deficiency is a condition that affects many body systems. Its signs and symptoms can involve blood cells, the immune system, the eyes, and the nervous system. The severity of the signs and symptoms vary widely. [from MedlinePlus Genetics]

ARCND2B is characterized by the typical features of auriculocondylar syndrome, including the pathognomonic question mark ears, consisting of a variable degree of clefting between the helix and earlobe, as well as hypoplasia of the mandibular condyle, temporomandibular joint abnormalities, micrognathia, microstomia, glossoptosis, and a round facial appearance with prominent cheeks. Patients have difficulty chewing, respiratory abnormalities, snoring, and obstructive and central apneas. In addition, they experience severe gastrointestinal problems, including feeding difficulties with failure to thrive, gastroesophageal reflux, and chronic constipation, and male patients show macropenis whereas female patients may exhibit clitoromegaly (summary by Leoni et al., 2016). Heterozygous mutation in the PLCB4 gene also causes an autosomal dominant form of auriculocondylar syndrome (see ARCND2A, 614669). For a discussion of genetic heterogeneity of auriculocondylar syndrome, see ARCND1 (602483). [from OMIM]

A abnormal, congenital formation or mark on the skin or neighboring mucosa that does not show neoplastic growth. [from NCI]

There is a soft tissue cleft medial to the inner canthus with a cleft of the root of the eyebrow. The frontal process of the maxilla is flat and broadened, and the ethmoid labyrinth is increased in tranverse dimension, thereby producing orbital hypertelorism. The cribriform plate is of normal width. The frontal sinus is enlarged. Even though the frontal bone is flattened, bony clefts with encephalocele have not been observed. There is a lateral displacement of the inner canthus with a mild thinning, aplasia, or irregularity of the medial end of the eyebrow. There are no eyelid clefts. The soft tissue contour of the forehead is normal, with only a short downward prolongation of the paramedian frontal hairline to mark the superior extent of the soft tissue cleft. Flattening of the frontal process of the maxilla, an increase in the transverse dimension of the ethmoid sinus, and a laterally convex bowing of the medial orbital wall produce orbital hypertelorism. Superiorly there is a minor flattening of the frontal bone medially, and the nasofrontal angle is somewhat obtuse. The extensive pneumatization of the sinuses on the cleft side extends backward through the frontal and ethmoid sinuses and into the sphenoid sinus. The anatomy of the sphenoid, including the pterygoid processes, is otherwise normal. The anterior and middle cranial fossae floors are both broadened on the cleft side with minor widening of the cribriform plate. [from HPO]

As seen in a typical cleft lip, a cleft of the lip is found in the region of the cupid's bow. The nostril is cleft through the alar dome and extends above onto the nasal dorsum. It passes medial to a normal, but dys- topic, medial canthus. There is an alveolar cleft between the central and lateral incisors that extends above through the pyriform margin lateral to the anterior nasal spine; the nasal septum is not involved. The bony cleft extends through the nasal bone or between the junction of the nasal bone and frontal process of the maxilla. Above the cleft lip, the clefting of the alar dome is associated with deviation to the opposite side of the shortened and broadened columella and nasal tip. Extension of the soft tissue cleft onto the nasal dorsum can be manifest as a series of vertical soft tissue furrows and ridges. Vertical inner canthal dysto- pia and severe telecanthus mark the superior aspect of the Number 1 facial cleft. A cranial soft tissue extension characterized by a tongue-like projection of the frontal hairline delineates the number 13 cleft. Skeletal clefting of the maxilla may extend posteriorly to form a complete cleft of the hard and soft palate. The maxilla is hypoplastic in all three dimensions. There is a keel-shaped alveolus and anterior open bite. Normal septation is preserved between the nasal cavity and the hypoplastic maxillary antrum on the affected side. Distortion of the nasal skeleton produces gross flattening of the nasal dorsum. There is asymmetry of the pterygoid plates, of the greater and lesser wings of the sphenoid, and of the floor of the anterior cranial fossa. The distortion of the cranial base may result in a mild plagiocephaly. [from HPO]

Cafe-au-lait spots are hyperpigmented lesions that can vary in color from light brown to dark brown with smooth borders and having a size of 1.5 cm or more in adults and 0.5 cm or more in children. [from HPO]

Abnormalities of the mandible are another characteristic feature of auriculo-condylar syndrome. These abnormalities often include an unusually small chin (micrognathia) and malfunction of the temporomandibular joint (TMJ), which connects the lower jaw to the skull. Problems with the TMJ affect how the upper and lower jaws fit together and can make it difficult to open and close the mouth. The term "condylar" in the name of the condition refers to the mandibular condyle, which is the upper portion of the mandible that forms part of the TMJ.

Most people with auriculo-condylar syndrome have malformed outer ears ("auriculo-" refers to the ears). A hallmark of this condition is an ear abnormality called a "question-mark ear," in which the ears have a distinctive question-mark shape caused by a split that separates the upper part of the ear from the earlobe. Other ear abnormalities that can occur in auriculo-condylar syndrome include cupped ears, ears with fewer folds and grooves than usual (described as "simple"), narrow ear canals, small skin tags in front of or behind the ears, and ears that are rotated backward. Some affected individuals also have hearing loss.

Other features of auriculo-condylar syndrome can include prominent cheeks, an unusually small mouth (microstomia), differences in the size and shape of facial structures between the right and left sides of the face (facial asymmetry), and an opening in the roof of the mouth (cleft palate). These features vary, even among affected members of the same family.

Auriculo-condylar syndrome is a condition that affects facial development, particularly development of the ears and lower jaw (mandible). [from MedlinePlus Genetics]

A oval and round, colored (usually medium-to dark brown, reddish brown, or flesh colored) lesion. Typically, a melanocytic nevus is less than 6 mm in diameter, but may be much smaller or larger. [from HPO]

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 hemangioma is a benign tumor characterized by blood-filled spaces lined by benign endothelial cells. A hemangioma characterized by large endothelial spaces (caverns) is called a cavernous hemangioma (in contrast to a hemangioma with small endothelial spaces, which is called capillary hemangioma). [from HPO]

The presence of a capillary hemangioma, which are hemangiomas with small endothelial spaces. [from HPO]