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is a significant concern for physicians. Central$ |& w( [4 o" l+ \
precocious puberty (CPP), which is mediated5 `) B" N1 g7 u. d$ p4 y
through the hypothalamic pituitary gonadal axis, has
, D" I" @4 r, B' N8 w* na higher incidence of organic central nervous system
* S# \: ~" v4 n+ h! N2 Clesions in boys.1,2 Virilization in boys, as manifested/ p( h7 g; k4 m6 f
by enlargement of the penis, development of pubic
! S4 d' m b; Whair, and facial acne without enlargement of testi-0 A! g+ @' n; p0 C! z
cles, suggests peripheral or pseudopuberty.1-3 We3 C x0 r. y3 N8 y
report a 16-month-old boy who presented with the
) J7 r7 ?( y' oenlargement of the phallus and pubic hair develop-; N, `5 U. B+ _. N1 `
ment without testicular enlargement, which was due8 U$ t2 U& g* y1 ]/ {
to the unintentional exposure to androgen gel used by
1 z# N8 h" h* A& X" {2 T: r1 Othe father. The family initially concealed this infor-3 s3 D* e. x0 F7 O+ x4 B
mation, resulting in an extensive work-up for this# M$ n9 u/ s1 L m6 R
child. Given the widespread and easy availability of
4 X6 y$ K! i+ a% ptestosterone gel and cream, we believe this is proba-! F* Z: N" W: x& ^; u9 o8 u3 ]
bly more common than the rare case report in the- }5 o9 f% _2 `; L j
literature.4
( _8 u% P; m+ C. {/ `' ZPatient Report% h% C/ @( ?! m/ `8 E
A 16-month-old white child was referred to the
" C+ U5 N- m& b8 Y8 K1 `endocrine clinic by his pediatrician with the concern
- G( }3 Z/ |1 |+ q' _8 eof early sexual development. His mother noticed6 H9 |4 }' U! W# m4 H
light colored pubic hair development when he was; t6 R4 Q. U2 y" A
From the 1Division of Pediatric Endocrinology, 2University of
# a1 H0 v8 X* a; j0 I; H7 ^& [3 hSouth Alabama Medical Center, Mobile, Alabama.
. B6 [6 ~/ p/ G& D' y7 IAddress correspondence to: Samar K. Bhowmick, MD, FACE,
8 b+ h1 L% b6 w% DProfessor of Pediatrics, University of South Alabama, College of4 z( C7 o0 L1 f( Z2 B
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
, s( `" L1 v! O1 a) N6 @1 ^! je-mail: [email protected]./ g1 q5 D N3 V/ `: v ?6 g
about 6 to 7 months old, which progressively became
8 v7 [+ `* I( D& J; q4 Idarker. She was also concerned about the enlarge-' @: g5 V# T8 P$ C9 t% E
ment of his penis and frequent erections. The child
+ }$ O& B5 z, Z8 V( u% i; N0 Lwas the product of a full-term normal delivery, with" D, \5 t6 S( M$ \2 T- V
a birth weight of 7 lb 14 oz, and birth length of: f5 B( Y4 a+ j5 ^" s0 _
20 inches. He was breast-fed throughout the first year
4 E, h# C9 d/ u% wof life and was still receiving breast milk along with
+ R2 [) ~. O) L+ usolid food. He had no hospitalizations or surgery,
: W2 _- @9 B4 ^" L9 Z- @: U4 E* Zand his psychosocial and psychomotor development4 U" P: s3 |- o: P' L
was age appropriate.! K0 ]! z+ _& _) K
The family history was remarkable for the father,
4 R6 R0 A" A! \% \who was diagnosed with hypothyroidism at age 16,
! J5 X- K6 ]6 W, ?! kwhich was treated with thyroxine. The father’s) d* G6 m, {; t) h, u( i7 T+ ?/ A
height was 6 feet, and he went through a somewhat
7 t' I, Z& `5 ^( p: c8 T- V! dearly puberty and had stopped growing by age 14.
K# Q y$ s2 f* @7 R$ mThe father denied taking any other medication. The+ V; c. T9 `$ ?, F, `
child’s mother was in good health. Her menarche
) Q! T# |# k+ @/ d* Hwas at 11 years of age, and her height was at 5 feet
+ C! Y* |! w _8 r% D; n. C5 inches. There was no other family history of pre-7 K1 f2 f/ _# s. {* z. I
cocious sexual development in the first-degree rela-5 \& Y8 l" b) A! c9 k/ f2 Z8 }" s
tives. There were no siblings.. B+ W% w7 }0 z1 w' l$ V: |7 }
Physical Examination
: t6 b& h1 Q/ hThe physical examination revealed a very active,- \1 b& Y& m, p5 C
playful, and healthy boy. The vital signs documented
1 X4 m9 v e* f* d+ J# ca blood pressure of 85/50 mm Hg, his length was6 p9 v! [6 U3 r1 N( \0 a
90 cm (>97th percentile), and his weight was 14.4 kg
9 f7 `6 x ~; ?+ C7 H4 N; S5 v(also >97th percentile). The observed yearly growth
! L1 \: l4 x3 G5 b1 H4 o3 }8 z% h/ mvelocity was 30 cm (12 inches). The examination of
- ~ c, X# P; K: ~. Rthe neck revealed no thyroid enlargement.
8 ~% u9 `3 p% NThe genitourinary examination was remarkable for# X$ z! I! g/ H. G3 V+ z
enlargement of the penis, with a stretched length of/ P" }2 X3 Y! n
8 cm and a width of 2 cm. The glans penis was very well
/ a+ }8 A0 E7 x- [& {developed. The pubic hair was Tanner II, mostly around# Q4 v, N" h5 v. m; S
540
0 s6 Q$ S1 _1 c% d/ Y1 gat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 X0 [, k' P- [* R3 s7 h- h
the base of the phallus and was dark and curled. The
$ M! j6 A: P# q" \* \0 ^1 m, E d$ Wtesticular volume was prepubertal at 2 mL each.
( m& B7 e3 M C. l5 KThe skin was moist and smooth and somewhat
. B( F" F* y/ x" ^, Q9 e8 Toily. No axillary hair was noted. There were no
* l L. z. x" `# F% b# C# l* g9 \abnormal skin pigmentations or café-au-lait spots.
" h b5 l% G. {) _# q# fNeurologic evaluation showed deep tendon reflex 2+ F; n8 c1 t9 w( P; A2 o) W" `2 y$ ~
bilateral and symmetrical. There was no suggestion
# E. H0 O8 S' V( t6 F3 Fof papilledema.
7 R+ s" O+ c" I4 l7 L, c, E) wLaboratory Evaluation
, Y: ~2 x9 _* ], ^. W5 PThe bone age was consistent with 28 months by
9 o7 U" Y, }6 D0 S6 _. Nusing the standard of Greulich and Pyle at a chrono-
5 o3 }' b# o. b9 e s- C* Xlogic age of 16 months (advanced).5 Chromosomal' ^/ g: h8 o1 H3 v) E" B6 V+ c0 p
karyotype was 46XY. The thyroid function test
t* N! a8 [$ L' O1 E* R9 l# ?showed a free T4 of 1.69 ng/dL, and thyroid stimu-2 v3 [4 W, Q. z# l5 v
lating hormone level was 1.3 µIU/mL (both normal).
) {' ^9 q! n6 i2 b) wThe concentrations of serum electrolytes, blood, L- ?2 O- T5 N& Y) M4 G% T' w5 D
urea nitrogen, creatinine, and calcium all were5 a* D/ q" K5 x" S' o5 b
within normal range for his age. The concentration
2 D n$ w& y7 y: M: iof serum 17-hydroxyprogesterone was 16 ng/dL0 ~+ }0 ^2 D# E* a4 t: f3 A
(normal, 3 to 90 ng/dL), androstenedione was 20( k T8 Z/ f. g# w
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
- @3 G/ X& c1 B; Kterone was 38 ng/dL (normal, 50 to 760 ng/dL),* U+ R9 h9 P* V. O6 K
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
$ Q9 D1 _% x [49ng/dL), 11-desoxycortisol (specific compound S). R: _ ?3 [! B$ O: v5 o0 e/ u& t: {
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
& x5 }, ]: ~+ w- i! w4 r# h, s' ftisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
2 d1 s; J' p5 w9 h" O& `testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
J+ V* t7 z" i* p4 Z0 Yand β-human chorionic gonadotropin was less than+ h4 u: V7 F4 o3 Q- I
5 mIU/mL (normal <5 mIU/mL). Serum follicular
8 L- D2 E/ V4 X- Ustimulating hormone and leuteinizing hormone
" P4 K t' p7 q( @2 k$ R+ w. m _1 m/ lconcentrations were less than 0.05 mIU/mL
0 _( e9 Y. k6 U- @" Z+ T: o(prepubertal).
* v4 R4 J( C- M. bThe parents were notified about the laboratory
0 ^7 p8 A6 h% Uresults and were informed that all of the tests were. C/ c9 R' u& C# Y: j0 J* n
normal except the testosterone level was high. The1 i: A) D% l7 Q
follow-up visit was arranged within a few weeks to' u6 a( h6 i6 Z1 \
obtain testicular and abdominal sonograms; how-- ?0 N8 x$ d$ p* M" t
ever, the family did not return for 4 months.+ P, @8 t5 j: m" e/ f7 ~/ o
Physical examination at this time revealed that the4 L3 X b; r5 x+ G+ G# X: {9 x/ o
child had grown 2.5 cm in 4 months and had gained
! _; e4 t1 u9 f+ x7 Y9 N# B2 kg of weight. Physical examination remained* X4 U( W7 ^1 L" P9 L# B
unchanged. Surprisingly, the pubic hair almost com-
" a4 p5 M; [: K; p) A; gpletely disappeared except for a few vellous hairs at3 f6 z1 Y9 v. W) [% f, o
the base of the phallus. Testicular volume was still 29 x) {" h& {- f5 m
mL, and the size of the penis remained unchanged., e$ f+ u) ~ |3 M7 E
The mother also said that the boy was no longer hav-
7 z7 N+ p R% y1 X- Zing frequent erections.: _- {2 |: L& Q: p+ [
Both parents were again questioned about use of
7 W5 k* s! Z. j* D+ @any ointment/creams that they may have applied to
4 f' t4 t b1 ~2 e5 z9 {the child’s skin. This time the father admitted the. _& i7 F: `& I# `, f% o
Topical Testosterone Exposure / Bhowmick et al 541
$ S+ L8 F$ z+ `) [& d8 Ause of testosterone gel twice daily that he was apply-
$ ] y {( r- D6 Jing over his own shoulders, chest, and back area for
5 S- w- r3 P7 o9 y7 W8 z8 C! ?; ka year. The father also revealed he was embarrassed4 v+ V# G( I! ^0 W" |- y
to disclose that he was using a testosterone gel pre-
+ c W1 n* q/ O, R: W* |7 a, W7 qscribed by his family physician for decreased libido; t' |4 @& z% ]
secondary to depression.+ [5 [* H- \7 J! r" A
The child slept in the same bed with parents.2 ]& Z+ e2 M* ^/ r! }
The father would hug the baby and hold him on his; n: X+ m& A$ C+ V- F% i
chest for a considerable period of time, causing sig-
0 ~) E% m- t3 \! J$ `+ M' Wnificant bare skin contact between baby and father.
7 [/ S/ {, q( y1 x, [ _( Z$ bThe father also admitted that after the phone call,9 J! z" ?$ K; s( {: T
when he learned the testosterone level in the baby+ ?+ [9 ~$ s- ~: q0 h9 e
was high, he then read the product information
6 l7 \ x$ Q, ]1 n* bpacket and concluded that it was most likely the rea-" _/ [* L6 |: u0 j
son for the child’s virilization. At that time, they
: D5 L. c! r' L* V wdecided to put the baby in a separate bed, and the, {. P" T! O3 ]' I
father was not hugging him with bare skin and had K8 A& V2 ?0 k8 Z( }
been using protective clothing. A repeat testosterone
/ e. _ V: D% y" X1 z S% ftest was ordered, but the family did not go to the
; |6 e6 O% `$ M8 mlaboratory to obtain the test.. R: x9 F( Q$ h: D: F* N
Discussion2 y4 r. Z' |. U" E! \- a
Precocious puberty in boys is defined as secondary; W% p% N7 [( q: j
sexual development before 9 years of age.1,46 {: q& Q/ y1 r" \' f3 S! B1 a
Precocious puberty is termed as central (true) when4 [$ F( s' a$ M5 K4 n. h9 t
it is caused by the premature activation of hypo-2 ]: I5 f' V& l& x' d7 g
thalamic pituitary gonadal axis. CPP is more com-
) e* K: Z8 U) g: Cmon in girls than in boys.1,3 Most boys with CPP/ z! f1 [4 o) A' A7 }
may have a central nervous system lesion that is
% E0 A" B( g/ t9 h5 K) _% jresponsible for the early activation of the hypothal-
/ }! s8 T1 ?/ L& ` Oamic pituitary gonadal axis.1-3 Thus, greater empha-
9 J4 ?; P4 C" r0 H3 Jsis has been given to neuroradiologic imaging in) X3 a& A/ Q, t: B' G% Z
boys with precocious puberty. In addition to viril-
* S8 A- r5 e$ o' j' Oization, the clinical hallmark of CPP is the symmet-
9 ^2 L+ T0 e2 D: |7 N1 A3 erical testicular growth secondary to stimulation by7 _9 r! D, E0 W
gonadotropins.1,3' z5 `+ I% [6 l3 t# S
Gonadotropin-independent peripheral preco-6 J1 w$ m7 n- ?; U B5 G
cious puberty in boys also results from inappropriate
+ X( D8 E1 K& m/ g, t) [androgenic stimulation from either endogenous or0 C7 M4 L: p! \1 S& E y8 Y* r
exogenous sources, nonpituitary gonadotropin stim- H0 U: H1 e% u, m" T, j0 ?- h6 B
ulation, and rare activating mutations.3 Virilizing- ^9 ~5 F# }1 Q2 `3 T3 R3 a
congenital adrenal hyperplasia producing excessive
6 R3 J; w: V5 O, ^1 Hadrenal androgens is a common cause of precocious
5 Z2 K* _% b \* [puberty in boys.3,4
8 C w) i" y/ x$ t! Z# i' rThe most common form of congenital adrenal
+ Y3 U5 Y' F/ Dhyperplasia is the 21-hydroxylase enzyme deficiency.
- L7 s7 e& d4 h# dThe 11-β hydroxylase deficiency may also result in
# Y0 B; {" z& i1 b. j7 Wexcessive adrenal androgen production, and rarely,
$ w! H6 h' [+ Ian adrenal tumor may also cause adrenal androgen
8 Y- X/ q! S( S' @excess.1,3; u" ]0 ?& o9 b/ i' w
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
% e5 r+ F8 U6 h3 y/ p( ]- `542 Clinical Pediatrics / Vol. 46, No. 6, July 2007& p% Y% f( S3 u
A unique entity of male-limited gonadotropin-
7 Z7 @+ M1 P+ {( R R; I) V4 aindependent precocious puberty, which is also known
& a9 b* D. }3 Z# M7 Oas testotoxicosis, may cause precocious puberty at a1 h7 m# } u* R, j5 M
very young age. The physical findings in these boys5 Q& M" @1 U& K! K
with this disorder are full pubertal development," Q: a' G2 `- i N4 K& p' s" d. Z
including bilateral testicular growth, similar to boys
: b6 @) B, y' L6 d: c* Iwith CPP. The gonadotropin levels in this disorder
: O' C) |- w0 g8 M% rare suppressed to prepubertal levels and do not show" @' a j9 P- }- N( v/ C
pubertal response of gonadotropin after gonadotropin-- j3 z' D. q2 A. e6 g
releasing hormone stimulation. This is a sex-linked
- E! k$ H# N H* s6 y: h @# Fautosomal dominant disorder that affects only
3 N+ j) z% n& }; ~: x7 r* Cmales; therefore, other male members of the family
: [7 A# \8 F K& x' y: m$ U1 m3 ^may have similar precocious puberty.3
0 A4 L1 I6 P' [" l8 b0 v7 QIn our patient, physical examination was incon-. @2 ?/ X6 j" O, a( x
sistent with true precocious puberty since his testi-: |# r; U' }# g8 v0 k' k: v! W4 \) K
cles were prepubertal in size. However, testotoxicosis
" b+ }) h' `# ]5 W6 dwas in the differential diagnosis because his father: |% y' k, G4 G
started puberty somewhat early, and occasionally,# a- h( |, ~" U
testicular enlargement is not that evident in the# e/ u9 ^+ d( [2 z6 @
beginning of this process.1 In the absence of a neg-( T& q9 G5 i0 m# Q: X2 C# r; i
ative initial history of androgen exposure, our
4 d5 j$ p% r% Q; K D- b' K8 xbiggest concern was virilizing adrenal hyperplasia,9 w& C, R. K/ ]0 q% a1 I2 M
either 21-hydroxylase deficiency or 11-β hydroxylase
0 J3 V. I1 q) T) @2 q( ^, Z) Ldeficiency. Those diagnoses were excluded by find-
& Y% _3 s( e7 d! j3 _* Iing the normal level of adrenal steroids.$ C3 c7 l* U) i
The diagnosis of exogenous androgens was strongly
. n( {4 V5 m5 }- i' g+ xsuspected in a follow-up visit after 4 months because6 l9 P" m+ a6 X/ e; l
the physical examination revealed the complete disap-9 A5 r( q/ v* {
pearance of pubic hair, normal growth velocity, and: h9 P, I) @3 M4 }
decreased erections. The father admitted using a testos-: N5 @" k2 f& M7 n5 ]; M! o, Z( [
terone gel, which he concealed at first visit. He was0 E' h1 _- l2 _2 y% K. r4 H: W
using it rather frequently, twice a day. The Physicians’
- [0 y8 }$ e+ ?! W$ G: mDesk Reference, or package insert of this product, gel or
' m$ p _0 O) O9 e9 v; Q0 S- G8 xcream, cautions about dermal testosterone transfer to
7 r, c- ?9 h- Hunprotected females through direct skin exposure.; c0 J) @& h4 w4 {3 D A( e7 ?: f
Serum testosterone level was found to be 2 times the6 J' V* ~( g, P
baseline value in those females who were exposed to3 ^5 O: F6 L, {2 Q& x, w
even 15 minutes of direct skin contact with their male
K8 D, o, I! K4 hpartners.6 However, when a shirt covered the applica-" x' G5 \# q, Z2 X6 p
tion site, this testosterone transfer was prevented.
1 d* Z( B7 T& H3 X% K8 POur patient’s testosterone level was 60 ng/mL,- o5 a" h: q: E7 y
which was clearly high. Some studies suggest that
5 s; @) x8 q- l" I5 Xdermal conversion of testosterone to dihydrotestos-
* X0 C: K# k' F. iterone, which is a more potent metabolite, is more
4 G# R# t' h" H1 f( w1 `active in young children exposed to testosterone
9 {. b! q' K/ \4 i2 J8 Xexogenously7; however, we did not measure a dihy- u4 W) Y+ H! P2 {8 L) F
drotestosterone level in our patient. In addition to8 r U1 r- |& I. a7 _8 O
virilization, exposure to exogenous testosterone in% [2 K& y( e/ @0 ~% Q
children results in an increase in growth velocity and& {1 k$ C) P+ p0 X- `
advanced bone age, as seen in our patient.
, N# R* ~) w7 `The long-term effect of androgen exposure during% J0 W U4 I: p$ K g7 f: w4 M- P
early childhood on pubertal development and final; F S+ \4 M9 P. ^) N& O9 l
adult height are not fully known and always remain
. U: @" a/ c) ?3 o, S8 h l. Ja concern. Children treated with short-term testos-5 F3 y; H6 B% t9 m7 T0 d9 O
terone injection or topical androgen may exhibit some# ^) N3 b8 k, k" Z+ E$ U
acceleration of the skeletal maturation; however, after9 M& g& ^5 F; [: c
cessation of treatment, the rate of bone maturation0 f) u1 G9 ~/ m( l: t: K
decelerates and gradually returns to normal.8,9
R" q& {7 ]; g! l' aThere are conflicting reports and controversy
8 l5 i1 r% t! `6 ]5 s Z4 ^5 G6 T, qover the effect of early androgen exposure on adult
1 f0 D5 w' Y# ?penile length.10,11 Some reports suggest subnormal
" |$ o5 N: Z- y V0 radult penile length, apparently because of downreg-3 r. a" `5 J6 f. H+ j, ?& f
ulation of androgen receptor number.10,12 However,( F7 Y, M8 f$ F1 t. a/ h0 v
Sutherland et al13 did not find a correlation between* h( K5 R7 }; A8 L7 q) y3 A
childhood testosterone exposure and reduced adult
1 ^; e3 Y2 D0 Y+ P* @* u9 J8 ?/ K3 Spenile length in clinical studies.7 g0 n7 Q7 u/ c s
Nonetheless, we do not believe our patient is
0 t: e" `. s4 w/ T# b) Vgoing to experience any of the untoward effects from
4 U& Y* A+ l9 q* Atestosterone exposure as mentioned earlier because
2 h8 k# k; K2 i" u/ u9 j: a s5 {the exposure was not for a prolonged period of time.
! R& ~$ c+ y) m$ AAlthough the bone age was advanced at the time of
9 a, T3 P: C* V" F& n+ `diagnosis, the child had a normal growth velocity at
! P8 `8 F6 Q! H, W* Z2 y5 R3 qthe follow-up visit. It is hoped that his final adult
# y6 C/ w! B% P) e, `4 Q$ {. lheight will not be affected.
/ Y! n; g+ I$ YAlthough rarely reported, the widespread avail-6 e! a% Z# o1 c H0 c' B
ability of androgen products in our society may
n3 |5 \' x9 y u4 Xindeed cause more virilization in male or female: I" c- h j# a9 P+ E
children than one would realize. Exposure to andro-
# e" i+ d+ t: A& `. ^' N1 Xgen products must be considered and specific ques-
U8 D. P ]8 J3 Ttioning about the use of a testosterone product or
3 c6 g4 @3 G( x0 m6 ]; |) m2 zgel should be asked of the family members during# n4 q7 r) s5 H; L r8 h. z. E5 t' c0 p
the evaluation of any children who present with vir-. n; L8 s: |, e" Y- |% q. e
ilization or peripheral precocious puberty. The diag-
5 n- l0 N" I1 N4 g) r2 {+ M% i2 O7 Lnosis can be established by just a few tests and by0 P( G1 W W8 t4 G) n8 Y! h4 }
appropriate history. The inability to obtain such a9 \; s: h* g; V( h: f7 p) {
history, or failure to ask the specific questions, may5 _2 W! I" n( U4 s* n: W3 W4 }
result in extensive, unnecessary, and expensive
0 q) g+ w6 j6 m2 r$ X& I) Pinvestigation. The primary care physician should be
0 h- ~9 p) Z- M' d- zaware of this fact, because most of these children
* b& f& |0 P1 R! E( L8 e3 _& |( w4 cmay initially present in their practice. The Physicians’3 s: P' k% j+ P' n
Desk Reference and package insert should also put a
4 X$ l2 _! [( L6 l9 A/ ?% w, ~. a: K Bwarning about the virilizing effect on a male or
* c2 R( @% D5 w1 y# b3 rfemale child who might come in contact with some-" ~ W+ @3 @ _: U
one using any of these products.9 d/ c# b+ R" H+ C" @* V8 C
References
9 [$ C4 f" G, R2 B6 I& g1. Styne DM. The testes: disorder of sexual differentiation8 q6 [! q" Y5 Y# p9 A% b9 u+ Q" }8 X
and puberty in the male. In: Sperling MA, ed. Pediatric
4 i! V" f W: l8 J B$ e4 T+ cEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;) `8 i$ m( ~& J# D& v* M
2002: 565-628.' e! p+ G+ k" g/ K4 k) r
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
9 s( x/ t+ h8 i" k( @4 c! z& @4 `puberty in children with tumours of the suprasellar pineal
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/ ^5 u8 N" j W* dareas: organic central precocious puberty. Acta Paediatr.
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3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
( f B* Y4 u0 H0 p6 k0 J& ePediatric Endocrinology. 4th ed. New York, NY: Marcel
! n7 E/ a( h. I7 A0 ZDekker Inc; 2003:211-238.
5 B! o% O5 r+ O" ]2 d1 A5 c; T4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual% ^2 F) z8 l. E) T
development in a two-year-old boy induced by topical; y9 Y c) l' p+ e( \3 ^
exposure to testosterone. Pediatrics. 1999;104:e23.+ x* O% x5 F8 z; h
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# _& E! ?$ ^& E/ v& M3 zSkeletal Development of the Hand and Wrist. 2nd ed.
B/ r% w- n+ b8 h4 K$ r3 VStanford, CA: Stanford University Press; 1959.
; z" n1 o+ i2 e `1 R. ~2 x, r" ?4 O7 D6. Physicians’ Desk Reference. Androgel 1% testosterone,
0 H1 l8 {9 @1 D: S8 K! qUnimed Pharmaceutical Inc. Montvale, NJ: Medical
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