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is a significant concern for physicians. Central
8 J/ Q+ E0 M: ]- dprecocious puberty (CPP), which is mediated
/ b! w) U$ p# Athrough the hypothalamic pituitary gonadal axis, has
* ~# A" o8 D2 U( q' Y. ya higher incidence of organic central nervous system
$ b; R! a: }+ y: m+ Ylesions in boys.1,2 Virilization in boys, as manifested
" Q% G! H2 o4 u. sby enlargement of the penis, development of pubic; Q: ~& c$ y/ T5 l+ k3 C2 ]. d( p
hair, and facial acne without enlargement of testi-
4 x" F/ M5 ]2 Fcles, suggests peripheral or pseudopuberty.1-3 We! I' j, b! Q8 M# [+ L
report a 16-month-old boy who presented with the
% t) D7 K( Z [+ ienlargement of the phallus and pubic hair develop- E6 V. a" V. c% W4 m9 G
ment without testicular enlargement, which was due
, k% I* P( h1 ~( `9 ?% S3 ]7 wto the unintentional exposure to androgen gel used by
7 D0 ? s# U1 `2 R( Cthe father. The family initially concealed this infor-& M Q% v- t' p7 V: B
mation, resulting in an extensive work-up for this
( E- M; k8 v" J5 i* [8 T1 G; wchild. Given the widespread and easy availability of& `3 A9 I2 Q5 n3 A, A3 k7 S5 i
testosterone gel and cream, we believe this is proba-! D/ W, f! b$ Y, E; n. |
bly more common than the rare case report in the# y0 I5 h& V* j, O% T2 Z0 x
literature.4
: K& h; a- x2 {3 B2 e/ |' ?Patient Report2 F8 } u. Z: {- ]' s
A 16-month-old white child was referred to the7 p. u, |$ f8 g! ^% ^/ ?9 W/ Y
endocrine clinic by his pediatrician with the concern
) i0 Z4 i6 x' ?9 S. gof early sexual development. His mother noticed3 }0 l0 g0 I3 r- J( Y4 e
light colored pubic hair development when he was
: Y( W. D4 U: ^3 z( T; Q2 l8 R' ?From the 1Division of Pediatric Endocrinology, 2University of3 G$ ]' ?' M7 v; Q/ L8 a
South Alabama Medical Center, Mobile, Alabama./ T- }7 x9 X& W, W( {* E9 \
Address correspondence to: Samar K. Bhowmick, MD, FACE,4 C" p5 y: R6 v/ O) q# Z3 \
Professor of Pediatrics, University of South Alabama, College of: T: J: t* f% V% |9 y, Y
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;5 ^% U! a" ~( {& _+ v) Y( E
e-mail: [email protected]. _9 p2 U; I% s8 n! D' X4 a% t- W
about 6 to 7 months old, which progressively became* ~# f' O& `3 Q5 `
darker. She was also concerned about the enlarge-
2 a2 q& w( I' N' oment of his penis and frequent erections. The child
2 o! Z9 {4 f, Q( |was the product of a full-term normal delivery, with% ~: V, H; l H% Z+ N- B; m
a birth weight of 7 lb 14 oz, and birth length of
! }# g1 A$ G' |; ^: p, S/ n6 F0 }20 inches. He was breast-fed throughout the first year
( k* n3 s% w, Dof life and was still receiving breast milk along with6 r8 Z4 |( [) j: s# ]0 O- r {! f
solid food. He had no hospitalizations or surgery,9 x p1 n* V8 I! Y4 j: I
and his psychosocial and psychomotor development& D/ I( F5 ~- T D8 g
was age appropriate.
8 l% \9 m& n6 f- k5 HThe family history was remarkable for the father,5 [5 c1 m9 Z* }& w
who was diagnosed with hypothyroidism at age 16,; w9 I5 l. r8 f
which was treated with thyroxine. The father’s* t( o. C4 ~# H) a2 }6 D7 u" V
height was 6 feet, and he went through a somewhat6 _% S! F. l) F* f1 ` P8 A' `* }
early puberty and had stopped growing by age 14.% }0 d6 T- N' A( Y* k% w0 X& ~
The father denied taking any other medication. The! {" _; t7 A/ S* r3 B
child’s mother was in good health. Her menarche
h" ?4 V# j( ]* _4 P2 Iwas at 11 years of age, and her height was at 5 feet
0 N7 }* d4 r4 Q5 inches. There was no other family history of pre-; t# h' W% W+ A% ~
cocious sexual development in the first-degree rela-
+ D$ C9 v% j+ Q* A: U9 C! Utives. There were no siblings.
{3 u! ~4 \* K& b0 b- S8 J8 }Physical Examination
$ _) ^' a4 p5 y: sThe physical examination revealed a very active,: l* ~9 j5 ?4 a0 {
playful, and healthy boy. The vital signs documented/ B. S( V# c# x5 g7 W5 b" M6 g
a blood pressure of 85/50 mm Hg, his length was# I$ \1 p+ n2 F7 E7 a/ J: q
90 cm (>97th percentile), and his weight was 14.4 kg
+ m$ `( q9 C( u* ]& L(also >97th percentile). The observed yearly growth) V" r, m" @) W$ D( T5 f
velocity was 30 cm (12 inches). The examination of1 m& O- r ]) ^( A H5 ~
the neck revealed no thyroid enlargement.
, n' c( g' l1 f+ W. M8 qThe genitourinary examination was remarkable for8 W" U3 M# |% _3 c1 a; \
enlargement of the penis, with a stretched length of3 C' |) n( K+ X3 F- o
8 cm and a width of 2 cm. The glans penis was very well0 m s1 G8 h- l5 P4 t
developed. The pubic hair was Tanner II, mostly around7 ~* U+ K( |6 Z$ T1 e! I) J& p1 o
5400 E4 d3 m* H4 `! N7 r0 w" j
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* `7 O. v) E9 s3 @the base of the phallus and was dark and curled. The/ V" ` g6 j9 c- A- K
testicular volume was prepubertal at 2 mL each.
- N) r# K; {: w# f$ ]$ }The skin was moist and smooth and somewhat
1 E# u; h2 A' v2 `5 Yoily. No axillary hair was noted. There were no
5 k6 T+ n- }+ |% ^3 E9 cabnormal skin pigmentations or café-au-lait spots.
; ~" T5 ?" U# H: RNeurologic evaluation showed deep tendon reflex 2+
" C* ]& h, Q3 z& A1 Tbilateral and symmetrical. There was no suggestion e/ s9 g# h$ e9 x- T. i. n+ s' R
of papilledema.3 W# T) M) ?0 T9 {+ M9 j3 }4 ?
Laboratory Evaluation Q% u* {( _5 `+ d/ K. [
The bone age was consistent with 28 months by
! T6 \4 V# v0 @: l9 F! f1 E" T& Lusing the standard of Greulich and Pyle at a chrono-
. c+ \* P* x# b1 l! U' mlogic age of 16 months (advanced).5 Chromosomal
7 ~3 s/ m1 p) y5 e: c3 ?4 O# Ekaryotype was 46XY. The thyroid function test, x# \8 L/ S# X9 j* B* e" F$ M! W
showed a free T4 of 1.69 ng/dL, and thyroid stimu-% }8 u5 \3 Q, q. }4 \: s
lating hormone level was 1.3 µIU/mL (both normal). a/ }5 }4 k' \- ?. x' N$ H* J7 A
The concentrations of serum electrolytes, blood
; I; R5 w3 j6 O6 e# h/ Wurea nitrogen, creatinine, and calcium all were
9 K v o$ i9 r* }; a8 |within normal range for his age. The concentration
4 M0 y# `: L+ V, R- Z" Oof serum 17-hydroxyprogesterone was 16 ng/dL1 u/ Y" w1 e3 J7 Y" K. W( `
(normal, 3 to 90 ng/dL), androstenedione was 20
, D) v* a7 K& i: Z/ C; N2 yng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
4 T" [- F5 A) M X7 ~. Qterone was 38 ng/dL (normal, 50 to 760 ng/dL),
4 K, T3 w8 f5 F( N3 [# z# V! ~desoxycorticosterone was 4.3 ng/dL (normal, 7 to
$ z1 k" `, t, a8 U# G+ J+ [2 M49ng/dL), 11-desoxycortisol (specific compound S)* J; U n; g% Q( x! T, g/ H
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-7 A' `( a* @1 x
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total2 D% D4 M5 ~. Y2 N
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),# Y4 |+ D4 c% b6 x- I
and β-human chorionic gonadotropin was less than! _& {% t! Y) s: Q4 V& S! d
5 mIU/mL (normal <5 mIU/mL). Serum follicular& f; ?0 H; _8 N; _6 o/ Q Y4 \
stimulating hormone and leuteinizing hormone
- k; l) X3 V$ a! p1 uconcentrations were less than 0.05 mIU/mL
- `8 }% S) Q1 |9 S8 m/ Y7 O/ Z(prepubertal).
$ w! l+ K- p. ]& A0 ~$ ?The parents were notified about the laboratory
5 h. t, V/ {# t1 N+ G" P$ aresults and were informed that all of the tests were# J; x8 j5 z# ^
normal except the testosterone level was high. The
0 G! M' t+ g1 Z6 B" [follow-up visit was arranged within a few weeks to
/ G$ W; i& R$ P% Xobtain testicular and abdominal sonograms; how-
3 a2 C- b" X: u5 Jever, the family did not return for 4 months.; R) K5 I" n: }; ?
Physical examination at this time revealed that the
; b) n" V: e$ f- n. ichild had grown 2.5 cm in 4 months and had gained
+ F- Y5 v! }" D ?# u2 kg of weight. Physical examination remained: T0 u* S3 ~: A' g9 S
unchanged. Surprisingly, the pubic hair almost com-
8 t2 Q; u/ O8 |) y* D; K) wpletely disappeared except for a few vellous hairs at
0 ~! L4 a) j5 `7 cthe base of the phallus. Testicular volume was still 2, \7 i" {) K! x+ h$ _+ z7 l; x8 \( L
mL, and the size of the penis remained unchanged.
8 Y' t5 U' I7 h* dThe mother also said that the boy was no longer hav-
2 i3 W, j3 ?/ Bing frequent erections.
* X4 X5 g2 U6 q {: @Both parents were again questioned about use of. W8 f# n p `& F$ r
any ointment/creams that they may have applied to6 x+ v" |$ h( G+ @+ U/ a2 N6 I3 \
the child’s skin. This time the father admitted the' W$ [6 X0 K8 m1 s0 z
Topical Testosterone Exposure / Bhowmick et al 541
/ y+ a R" B8 B( Ruse of testosterone gel twice daily that he was apply-; @1 Y' H, ?7 C
ing over his own shoulders, chest, and back area for
+ v& A8 e b3 i1 Va year. The father also revealed he was embarrassed
$ y: A- S9 Y9 ^& g( F; oto disclose that he was using a testosterone gel pre-4 _7 _7 |. E# H- n8 ~/ |
scribed by his family physician for decreased libido3 {3 l6 u! G V8 d* N3 H: q
secondary to depression.
% U% H: B) A5 Z8 yThe child slept in the same bed with parents.' }4 v5 L0 U) j
The father would hug the baby and hold him on his) w6 t1 s. e7 w- k+ g
chest for a considerable period of time, causing sig-
" p, k; @ H* P1 Z6 u4 s) pnificant bare skin contact between baby and father./ @1 X' N* t. H4 h% W1 x+ b7 e
The father also admitted that after the phone call,
4 _, v [+ x4 \( q5 gwhen he learned the testosterone level in the baby- c2 s# T" q6 H0 K# t
was high, he then read the product information2 R. i/ }8 ~$ g* V- ?
packet and concluded that it was most likely the rea-
- ?/ K4 x5 S7 f$ A6 |* Wson for the child’s virilization. At that time, they# P* B+ X4 ~$ t- K# L8 M s
decided to put the baby in a separate bed, and the- D3 b/ P; q; `$ K
father was not hugging him with bare skin and had: r8 l+ I! {1 g, o3 e$ I e
been using protective clothing. A repeat testosterone1 N+ L) k* E( F0 C, I$ k9 E
test was ordered, but the family did not go to the
" `" E) m& o9 _" \# Flaboratory to obtain the test.
) J; a$ g7 {! W$ D9 ]# o" nDiscussion7 a/ R: j1 y5 j
Precocious puberty in boys is defined as secondary/ Q+ g( H, j$ ~. n+ |8 b
sexual development before 9 years of age.1,4. Y& }* f" a4 K
Precocious puberty is termed as central (true) when
9 z) e- _4 f% U! r. ^it is caused by the premature activation of hypo-" I" V9 ^- l; O7 ~/ i1 F8 V
thalamic pituitary gonadal axis. CPP is more com-
/ V0 c/ p0 P) w* s+ ~mon in girls than in boys.1,3 Most boys with CPP
4 @( V2 O+ |" t# y/ O* [' }; mmay have a central nervous system lesion that is( U2 u% k$ Y, h( K- Q
responsible for the early activation of the hypothal-
/ u3 j) q( Q4 oamic pituitary gonadal axis.1-3 Thus, greater empha-1 ^ }; M: y$ a' E
sis has been given to neuroradiologic imaging in' P1 @9 C$ x% ~) M* n
boys with precocious puberty. In addition to viril-
+ P# z% k0 `: w# u( Aization, the clinical hallmark of CPP is the symmet-
+ _6 o% Z. B6 ^% J! Arical testicular growth secondary to stimulation by' m! m. B, \& ~, C2 g% R3 i I
gonadotropins.1,3
4 }; T1 s0 ~! RGonadotropin-independent peripheral preco-+ V/ S. K- e: T0 |4 C' y
cious puberty in boys also results from inappropriate/ ]% I/ j7 o! ]6 h2 n
androgenic stimulation from either endogenous or
" p! w: P8 S: a2 R" X' j) hexogenous sources, nonpituitary gonadotropin stim-$ p( a/ }/ v8 e
ulation, and rare activating mutations.3 Virilizing0 |0 Q0 A8 h" v4 M0 B$ D9 p5 l
congenital adrenal hyperplasia producing excessive5 g b! I1 O: O: m* C
adrenal androgens is a common cause of precocious
- H" D: u& g& Q$ b* T8 O ipuberty in boys.3,4
/ e5 b n4 w7 iThe most common form of congenital adrenal* b6 D( R% X- B6 r4 K; ?, M. g
hyperplasia is the 21-hydroxylase enzyme deficiency.
7 \3 i: [/ s6 j( a% v) T; X7 QThe 11-β hydroxylase deficiency may also result in
" T! b% O1 I5 P2 s6 y4 C+ ^9 X6 hexcessive adrenal androgen production, and rarely,5 T' j) D1 h+ _, [, k- o4 m |
an adrenal tumor may also cause adrenal androgen4 [0 H9 n9 Z- D/ w/ \+ d! E8 }( A- @
excess.1,3
! U9 P# u3 f* [$ ~at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
. w% t/ V( u. e1 L$ }5 f542 Clinical Pediatrics / Vol. 46, No. 6, July 2007* t( g1 G4 T9 ]- }& m; m3 m3 M
A unique entity of male-limited gonadotropin-2 X f1 x! j+ O; H; _" a
independent precocious puberty, which is also known
' a" r+ D& N. Z# pas testotoxicosis, may cause precocious puberty at a# G' g) v+ q2 h% }: ~5 R( m
very young age. The physical findings in these boys& R) w8 J$ _+ M/ }4 M$ b) Q
with this disorder are full pubertal development," v6 U8 F/ U4 v! r3 J' L, q
including bilateral testicular growth, similar to boys. z* J: Z9 {, n7 k% {8 ^
with CPP. The gonadotropin levels in this disorder
1 I, w4 I! `2 A1 O) Jare suppressed to prepubertal levels and do not show
$ E+ F! B% X. d! f* U- C A0 Z W& Wpubertal response of gonadotropin after gonadotropin-9 \7 [3 s3 j/ f) a+ R
releasing hormone stimulation. This is a sex-linked
3 ^9 p3 Q3 k3 J) mautosomal dominant disorder that affects only( C5 D7 ^( k& e1 r( ~
males; therefore, other male members of the family6 \# r2 l% J* `: n6 V
may have similar precocious puberty.3
- H, K' } G7 B- Q# a* hIn our patient, physical examination was incon-# C3 i. Z5 g& @9 }7 k, W
sistent with true precocious puberty since his testi-5 y& _1 \9 N3 Q* D2 X7 L
cles were prepubertal in size. However, testotoxicosis
3 N7 |5 g6 _6 E7 Q E! jwas in the differential diagnosis because his father
9 _5 e$ |6 z4 i5 A0 Q6 Vstarted puberty somewhat early, and occasionally,
0 w* ^2 D: |2 W; D2 [! _testicular enlargement is not that evident in the
. @ B5 v, E/ A. d9 Z8 \, I+ {beginning of this process.1 In the absence of a neg-0 H" c: A* y( \% k" y
ative initial history of androgen exposure, our0 f2 q9 L! l3 p, j7 g; o
biggest concern was virilizing adrenal hyperplasia,% C% D% P' c% S8 r9 U9 t1 @
either 21-hydroxylase deficiency or 11-β hydroxylase
" x& ]4 c7 o3 X5 hdeficiency. Those diagnoses were excluded by find-
1 i% S" [7 t3 _' F5 `' k6 ring the normal level of adrenal steroids.- ~0 [+ G. P3 W
The diagnosis of exogenous androgens was strongly( |$ v" x Q- Q+ i4 w0 s
suspected in a follow-up visit after 4 months because; K' r0 m+ v. [0 T- z+ P
the physical examination revealed the complete disap-" O3 ?0 q2 r8 Z" ^* }# c7 s
pearance of pubic hair, normal growth velocity, and1 A( W9 e; ?. ~
decreased erections. The father admitted using a testos-: W8 ^$ V( f/ a1 B* L. z7 |4 D
terone gel, which he concealed at first visit. He was7 o' N/ v, d1 `9 m$ Q# _9 P r/ U
using it rather frequently, twice a day. The Physicians’
3 u+ O& ]5 i6 ]3 [- t# EDesk Reference, or package insert of this product, gel or6 s! }" l: F* I9 X
cream, cautions about dermal testosterone transfer to% Q8 t% x- i+ b2 R8 u% B0 m! X" E! t
unprotected females through direct skin exposure.1 w! H0 l z0 f0 a
Serum testosterone level was found to be 2 times the
) Y+ Q- F. ?& z# g3 g0 r7 Q2 ~baseline value in those females who were exposed to) [/ [- A$ b& f& X: [
even 15 minutes of direct skin contact with their male
0 L* ` Q J; A% ~1 l* Dpartners.6 However, when a shirt covered the applica-6 N& S3 q+ ^/ a6 t
tion site, this testosterone transfer was prevented.
- r. L' `% ^( VOur patient’s testosterone level was 60 ng/mL,
! s; a' d$ U/ d9 |0 ywhich was clearly high. Some studies suggest that
, `, y: C$ u; Y2 H# T+ ldermal conversion of testosterone to dihydrotestos-
- u6 F' \" b& q) t, ^& [2 Uterone, which is a more potent metabolite, is more
9 ]; z6 X$ @. j# qactive in young children exposed to testosterone1 S; a. D9 N3 U" j% ?
exogenously7; however, we did not measure a dihy-. ?: B0 ]. \% z; P; ]
drotestosterone level in our patient. In addition to% e6 l/ L4 z3 w) i( S: a( k) J
virilization, exposure to exogenous testosterone in
0 a2 C- c: ?5 S# h: a+ Bchildren results in an increase in growth velocity and
( g3 l3 H1 |) [: Y E5 N2 U/ Sadvanced bone age, as seen in our patient.8 r- ?. A! r5 W5 \9 g
The long-term effect of androgen exposure during% I9 V- B" q! p8 k, V
early childhood on pubertal development and final
( y; o% o4 d. e8 W; _. eadult height are not fully known and always remain; Y: j6 [4 G1 S
a concern. Children treated with short-term testos-* \1 i& P) Q# _
terone injection or topical androgen may exhibit some
/ I+ [2 O F* ~& H6 x: tacceleration of the skeletal maturation; however, after
7 o( S+ R- i( Z& [# Icessation of treatment, the rate of bone maturation
s; ]2 q& x. r A% A8 ?4 L& @7 vdecelerates and gradually returns to normal.8,9
8 H5 I3 G# ?4 zThere are conflicting reports and controversy
) d* Z j2 k7 g+ E8 z6 S; Oover the effect of early androgen exposure on adult
. u d2 \% r' w9 K6 dpenile length.10,11 Some reports suggest subnormal
. Y E* F, f# D, ^1 aadult penile length, apparently because of downreg-
7 I p% Q: e+ m# _ulation of androgen receptor number.10,12 However,
' S3 G9 L: ^- T0 g7 v+ iSutherland et al13 did not find a correlation between
1 ~2 M9 x) p% H! X1 E; H- ]( qchildhood testosterone exposure and reduced adult
4 p$ N7 y p" ^5 Q9 l/ {6 G% n& ppenile length in clinical studies.
4 f+ I* K( j% P6 s9 eNonetheless, we do not believe our patient is
9 b0 `/ O k P7 Kgoing to experience any of the untoward effects from+ ]: \+ o! I+ y8 q' Q/ p( A
testosterone exposure as mentioned earlier because
* C; k, E8 m' W! Z. lthe exposure was not for a prolonged period of time.: u; K* Q8 s' d2 Y
Although the bone age was advanced at the time of
% d' i6 P3 n% v/ tdiagnosis, the child had a normal growth velocity at
1 R% A' w, e0 s& c5 Pthe follow-up visit. It is hoped that his final adult
1 g/ u) x, K) S9 ]! B- l# C: theight will not be affected.! C9 S! }. i' }" u! U" a0 j9 E
Although rarely reported, the widespread avail-
2 ~" }/ g# N1 T5 ~2 `8 Sability of androgen products in our society may: e3 q& G8 S1 S* i6 Z' f& ?" o
indeed cause more virilization in male or female
# v* y* l0 Y9 Qchildren than one would realize. Exposure to andro-* ^. Q5 ]# r8 t4 O3 a6 V
gen products must be considered and specific ques-
; ?& B8 S8 K+ m5 w4 o) [0 Etioning about the use of a testosterone product or
8 g" h6 N" w( V2 o9 Qgel should be asked of the family members during9 F Y; z1 D2 Y* d/ a
the evaluation of any children who present with vir-
: X- {: K& J2 J7 J- g% {7 zilization or peripheral precocious puberty. The diag-- ]8 _6 r Z5 B# w J0 b$ Y4 W$ q
nosis can be established by just a few tests and by7 ]! T2 l& u5 W, `, o0 H
appropriate history. The inability to obtain such a2 M. i, |/ i- A
history, or failure to ask the specific questions, may
. [# i% \; b% Z# r% ]0 k6 Aresult in extensive, unnecessary, and expensive+ B. G0 y1 r7 u7 u: d% O
investigation. The primary care physician should be
! [, T$ g' ~" U$ kaware of this fact, because most of these children
5 }- U- [) l, Tmay initially present in their practice. The Physicians’
, j8 K3 ?6 v. ]Desk Reference and package insert should also put a; X5 a$ }4 L% \4 a Q. Z
warning about the virilizing effect on a male or
( z }& ?2 Y% v. u5 g% |' V& U4 Cfemale child who might come in contact with some-
5 B: J0 G8 z- X+ D1 p+ ` P Kone using any of these products. _7 X3 ?: v# } @
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, }0 z4 o$ H" M. nEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
* B# L$ x$ D0 Z2002: 565-628.* J$ u( {: W' @! _" c {. O+ u. D
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious1 b9 B, {# {- T! \& o% b) \9 u
puberty in children with tumours of the suprasellar pineal3 c5 |; @" v8 d/ p) I
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from/ e, i8 p9 E. {+ e4 b9 n8 x/ B. C
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( i+ H5 U, t, b6 Y: |7 z" S9 H; Eareas: organic central precocious puberty. Acta Paediatr.
9 T0 j7 N1 h, ~5 G9 N2001;90:751-756.
' n: k6 Y6 a2 A; X& `9 O3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
8 h' y& M; \0 F& L! WPediatric Endocrinology. 4th ed. New York, NY: Marcel4 Z1 _$ c- S) K9 j( L' v$ L
Dekker Inc; 2003:211-238.' `( W+ Z3 F% ^( Y: \5 ~: r2 o0 C
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual% `# {3 T) w. _4 E, M8 z: a5 F7 h
development in a two-year-old boy induced by topical
" b4 T7 w* Z! q* F2 `( l: T, vexposure to testosterone. Pediatrics. 1999;104:e23.
: [/ f5 O6 G) P2 d5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
) ], A* V- K/ w0 }- q4 ESkeletal Development of the Hand and Wrist. 2nd ed.2 o8 f# D; F$ x9 D9 \. B
Stanford, CA: Stanford University Press; 1959.6 v K+ i, ?: p- a" \2 v
6. Physicians’ Desk Reference. Androgel 1% testosterone,
7 f& m& D" I3 [; EUnimed Pharmaceutical Inc. Montvale, NJ: Medical
j0 }/ j7 q/ s/ F9 J1 d- t: }9 k6 HEconomics Company, Inc; 2004:3239-3241.# K% u" g% F; B/ }4 L( u
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