measurements & dates for small parts
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47 Terms
What is the normal adult thyroid isthmus measurement?
4-6 mm
Parathyroid glands typically measure how large?
Less than 4 mm
What is the normal adult thyroid length measurement?
4-6 cm
What is the normal adult thyroid height measurement?
2-3 cm
What is the normal adult thyroid width measurement?
1.3-1.8 cm
A parathyroid adenoma will typically measure less than…
But the largest adenoma could measure greater than…
3 cm
5 cm
The thyroid emerges by what gestational week?
Week 3 or 4
What gestational week will the thyroid divide into two lobes and be connected by the isthmus?
Week 7
What is the normal measurement for bursa?
Less than 2 mm
What measurement would be considered a thickened lymph node cortex?
Greater than 3 mm
What gestational week will breast structure development take place?
Week 15
A normal spermatic cord will measure up to __ mm in diameter.
2 mm
An abnormal spermatic cord will measure over __ mm in diameter.
2 mm
What is the testicular length measurement?
3-5 cm
What is the testicular height measurement?
2-3 cm
What is the testicular width measurement?
2-3 cm
An abnormal varicocele will be greater than…
2 mm
Masses of benign Leydig and Sertoli cell tumors are small, less than…
1 cm
What is the length x height x width measurement for the prostate?
4 cm x 3 cm x 2 cm
What gestational week will the prostate begin to form?
Week 11
A mega cisterna magna will measure greater than…
10 mm
What is the measurement for a mild dilation of the ventricles of an intracranial hemorrhage?
8-10 mm
What is the measurement for a moderate dilation of the ventricles of an intracranial hemorrhage?
11-14 mm
What is the measurement for a severe dilation of the ventricles of an intracranial hemorrhage?
Greater than 14 mm
A choroid plexus cyst associated with chromosomal abnormalities (i.e., trisomy 21) will measure greater than…
10 mm
Intracranial bleeds can occur in premature babies under the age of __ gestational weeks.
34 weeks
The primary brain vesicles are seen at what week?
Week 4
The secondary brain vesicles are seen at what week?
Week 5
The filum terminale should measure less than…
2 mm
A subluxable hip is when the proximal femur moves more than __ mm to the left.
And more than __ mm to the right.
6 mm
4 mm
Defects in the spine will typically occur in the first __ weeks of life.
Week 8½
What week will the head of the femur ossify?
But it can occur between __ and __ months.
Week 4
3 and 8 months
Hip instability may resolve after __ to __ weeks.
4-6 weeks
Laxed hips will resolve after __ weeks
6 weeks
The femoral head should be stable within the acetabulum with stress after __ weeks of age.
4 weeks
Within __ to __ weeks of treatment, the hip joint often times should stabilize.
6-8 weeks
The neural plate forms at __ to __ days after conception.
18-20 days
An intracranial hemorrhage usually occurs within the first __ days of life.
4 days
Chronic testicular torsion is when torsion has lasted for more than __ days.
10 days
What is the formula for calculating prostatic volume?
Length x Height x Width x 0.52
What are the normal Type 1 alpha and beta angle measurements?
Alpha is greater than 60
Beta is less than 55
At what gestational month will the testes descend to the level of the urinary bladder?
Month 4
After what month will the testes descend through the inguinal canal and into the scrotum?
Month 7
The CSP will close within __-__ months of life.
3-6 months
Ventriculus terminalis will disappear within the first few _______ of life.
Months
Transient dilation of the central canal will disappear within the first few _______ of life.
Weeks
Developmental displacement of the hip is often diagnosed in the neonatal period, spanning from __-__ weeks.
4-6 weeks
Note 
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