U.S. flag

An official website of the United States government

Format

Send to:

Choose Destination

3M syndrome 2(3M2)

MedGen UID:
414168
Concept ID:
C2752041
Disease or Syndrome
Synonyms: 3-M Syndrome, OBSL1-Related; Three M syndrome 2
 
Gene (location): OBSL1 (2q35)
 
Monarch Initiative: MONDO:0013039
OMIM®: 612921

Disease characteristics

Excerpted from the GeneReview: Three M Syndrome
Three M syndrome is characterized by severe pre- and postnatal growth deficiency (final height 5-6 SD below the mean; i.e., 120-130 cm), characteristic facies, and normal intelligence. Additional features of three M syndrome include short broad neck, prominent trapezii, deformed sternum, short thorax, square shoulders, winged scapulae, hyperlordosis, short fifth fingers, prominent heels, and loose joints. Males with three M syndrome have hypogonadism and occasionally hypospadias. [from GeneReviews]
Authors:
Melita Irving  |  Muriel Holder-Espinasse   view full author information

Additional description

From OMIM
3M syndrome-2 (3M2) is characterized by low birth weight and short stature, relative macrocephaly, lumbar hyperlordosis, and prominent heels. Dysmorphic facial features include triangular face with frontal bossing and midface hypoplasia, anteverted nares with fleshy nasal tip, and full fleshy lips (Hanson et al., 2009). For a general phenotypic description and a discussion of genetic heterogeneity of 3M syndrome, see 3M1 (273750).  http://www.omim.org/entry/612921

Clinical features

From HPO
Scapular winging
MedGen UID:
66822
Concept ID:
C0240953
Anatomical Abnormality
Abnormal protrusion of the scapula away from the surface of the back.
Short 5th finger
MedGen UID:
334269
Concept ID:
C1842878
Congenital Abnormality
Hypoplasia (congenital reduction in size) of the fifth finger, also known as the little finger.
Prominent calcaneus
MedGen UID:
866740
Concept ID:
C4021088
Anatomical Abnormality
Protruding heel bone, or calcaneus.
Clinodactyly
MedGen UID:
1644094
Concept ID:
C4551485
Congenital Abnormality
An angulation of a digit at an interphalangeal joint in the plane of the palm (finger) or sole (toe).
Severe short stature
MedGen UID:
3931
Concept ID:
C0013336
Disease or Syndrome
A severe degree of short stature, more than -4 SD from the mean corrected for age and sex.
Fetal growth restriction
MedGen UID:
4693
Concept ID:
C0015934
Pathologic Function
An abnormal restriction of fetal growth with fetal weight below the tenth percentile for gestational age.
Small for gestational age
MedGen UID:
65920
Concept ID:
C0235991
Finding
Smaller than normal size according to sex and gestational age related norms, defined as a weight below the 10th percentile for the gestational age.
Short stature
MedGen UID:
87607
Concept ID:
C0349588
Finding
A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).
Protruding ear
MedGen UID:
343309
Concept ID:
C1855285
Finding
Angle formed by the plane of the ear and the mastoid bone greater than the 97th centile for age (objective); or, outer edge of the helix more than 2 cm from the mastoid at the point of maximum distance (objective).
Hyperlordosis
MedGen UID:
9805
Concept ID:
C0024003
Finding
Abnormally increased curvature (anterior concavity) of the lumbar or cervical spine.
Pectus carinatum
MedGen UID:
57643
Concept ID:
C0158731
Finding
A deformity of the chest caused by overgrowth of the ribs and characterized by protrusion of the sternum.
Frontal bossing
MedGen UID:
67453
Concept ID:
C0221354
Congenital Abnormality
Bilateral bulging of the lateral frontal bone prominences with relative sparing of the midline.
Dolichocephaly
MedGen UID:
65142
Concept ID:
C0221358
Congenital Abnormality
An abnormality of skull shape characterized by a increased anterior-posterior diameter, i.e., an increased antero-posterior dimension of the skull. Cephalic index less than 76%. Alternatively, an apparently increased antero-posterior length of the head compared to width. Often due to premature closure of the sagittal suture.
Short thorax
MedGen UID:
140876
Concept ID:
C0426789
Finding
Reduced inferior to superior extent of the thorax.
Thin ribs
MedGen UID:
98095
Concept ID:
C0426818
Finding
Ribs with a reduced diameter.
Delayed skeletal maturation
MedGen UID:
108148
Concept ID:
C0541764
Finding
A decreased rate of skeletal maturation. Delayed skeletal maturation can be diagnosed on the basis of an estimation of the bone age from radiographs of specific bones in the human body.
Lumbar hyperlordosis
MedGen UID:
263149
Concept ID:
C1184923
Finding
An abnormal accentuation of the inward curvature of the spine in the lumbar region.
Slender long bone
MedGen UID:
331446
Concept ID:
C1833144
Finding
Reduced diameter of a long bone.
Relative macrocephaly
MedGen UID:
338607
Concept ID:
C1849075
Congenital Abnormality
A relatively mild degree of macrocephaly in which the head circumference is not above two standard deviations from the mean, but appears dysproportionately large when other factors such as body stature are taken into account.
J-shaped sella turcica
MedGen UID:
381480
Concept ID:
C1854718
Finding
A deformity of the sella turcica whereby the sella extends further anterior than normal such that the anterior clinoid process appears to overhang it, giving the appearance of the letter J on imaging of the skull.
Malar flattening
MedGen UID:
347616
Concept ID:
C1858085
Finding
Underdevelopment of the malar prominence of the jugal bone (zygomatic bone in mammals), appreciated in profile, frontal view, and/or by palpation.
Dental malocclusion
MedGen UID:
9869
Concept ID:
C0024636
Anatomical Abnormality
Dental malocclusion refers to an abnormality of the occlusion, or alignment, of the teeth and the way the upper and lower teeth fit together, resulting in overcrowding of teeth or in abnormal bite patterns.
Delayed eruption of teeth
MedGen UID:
68678
Concept ID:
C0239174
Finding
Delayed tooth eruption, which can be defined as tooth eruption more than 2 SD beyond the mean eruption age.
High palate
MedGen UID:
66814
Concept ID:
C0240635
Congenital Abnormality
Height of the palate more than 2 SD above the mean (objective) or palatal height at the level of the first permanent molar more than twice the height of the teeth (subjective).
Short neck
MedGen UID:
99267
Concept ID:
C0521525
Finding
Diminished length of the neck.
Triangular face
MedGen UID:
324383
Concept ID:
C1835884
Finding
Facial contour, as viewed from the front, triangular in shape, with breadth at the temples and tapering to a narrow chin.
Depressed nasal bridge
MedGen UID:
373112
Concept ID:
C1836542
Finding
Posterior positioning of the nasal root in relation to the overall facial profile for age.
Thick vermilion border
MedGen UID:
332232
Concept ID:
C1836543
Finding
Increased width of the skin of vermilion border region of upper lip.
Prominent forehead
MedGen UID:
373291
Concept ID:
C1837260
Finding
Forward prominence of the entire forehead, due to protrusion of the frontal bone.
Anteverted nares
MedGen UID:
326648
Concept ID:
C1840077
Finding
Anteriorly-facing nostrils viewed with the head in the Frankfurt horizontal and the eyes of the observer level with the eyes of the subject. This gives the appearance of an upturned nose (upturned nasal tip).
Pointed chin
MedGen UID:
336193
Concept ID:
C1844505
Finding
A marked tapering of the lower face to the chin.
Prominent nasal tip
MedGen UID:
383839
Concept ID:
C1856118
Finding
Long philtrum
MedGen UID:
351278
Concept ID:
C1865014
Finding
Distance between nasal base and midline upper lip vermilion border more than 2 SD above the mean. Alternatively, an apparently increased distance between nasal base and midline upper lip vermilion border.

Term Hierarchy

Professional guidelines

PubMed

Karacan Küçükali G, Keskin M, Aycan Z, Savaş-Erdeve Ş, Çetinkaya S
Eur J Med Genet 2023 Oct;66(10):104828. Epub 2023 Sep 4 doi: 10.1016/j.ejmg.2023.104828. PMID: 37673300
Wit JM, Joustra SD, Losekoot M, van Duyvenvoorde HA, de Bruin C
Horm Res Paediatr 2021;94(3-4):81-104. Epub 2021 Jun 4 doi: 10.1159/000516407. PMID: 34091447
Simsek-Kiper PO, Taskiran E, Kosukcu C, Arslan UE, Cormier-Daire V, Gonc N, Ozon A, Alikasifoglu A, Kandemir N, Utine GE, Alanay Y, Alikasifoglu M, Boduroglu K
Am J Med Genet A 2019 Jul;179(7):1157-1172. Epub 2019 Apr 13 doi: 10.1002/ajmg.a.61154. PMID: 30980518

Recent clinical studies

Clinical prediction guides

Woolley SA, Hayes SE, Shariflou MR, Nicholas FW, Willet CE, O'Rourke BA, Tammen I
BMC Genet 2020 Sep 15;21(1):106. doi: 10.1186/s12863-020-00913-8. PMID: 32933480Free PMC Article

Supplemental Content

Table of contents

    Clinical resources

    Practice guidelines

    • PubMed
      See practice and clinical guidelines in PubMed. The search results may include broader topics and may not capture all published guidelines. See the FAQ for details.

    Recent activity

    Your browsing activity is empty.

    Activity recording is turned off.

    Turn recording back on

    See more...