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is a significant concern for physicians. Central8 {+ n/ e4 F; h" H) V
precocious puberty (CPP), which is mediated( C) m0 u5 P+ `3 E- K
through the hypothalamic pituitary gonadal axis, has8 ]+ l& C( l# U% U' X2 b! [
a higher incidence of organic central nervous system
$ t7 _+ E4 a" u! Hlesions in boys.1,2 Virilization in boys, as manifested
8 D; {$ o* U+ Z' ^8 @, q! mby enlargement of the penis, development of pubic+ N, _/ S. M3 {! Y$ t: C
hair, and facial acne without enlargement of testi-, d) `! i( n# [
cles, suggests peripheral or pseudopuberty.1-3 We
* x; Y$ Q" B( Y9 f* \report a 16-month-old boy who presented with the
8 ]! c. N: N' v; Wenlargement of the phallus and pubic hair develop-. _1 j7 r5 H* l5 B i
ment without testicular enlargement, which was due, \ o+ _% a& Y" x* p) V) n3 ^! Y, l
to the unintentional exposure to androgen gel used by
% `9 O" A' I) ?6 N; w" R: Lthe father. The family initially concealed this infor-
8 t' ]7 g8 V2 A- i4 P8 \! G. @, Z9 A4 Omation, resulting in an extensive work-up for this+ a3 w; O$ E( Z1 k
child. Given the widespread and easy availability of+ a3 \8 z( z! U: e1 a: h
testosterone gel and cream, we believe this is proba-
/ _$ N: I* H2 t4 X8 K6 h _bly more common than the rare case report in the8 q5 D8 N* T( C" ^1 J9 ~& D
literature.4
! ~ t, [% e% h4 w VPatient Report6 w I4 g, q, p( ?( ?8 n
A 16-month-old white child was referred to the
& k; J. X9 W s1 o$ i/ eendocrine clinic by his pediatrician with the concern2 I1 Q: A* ]' H
of early sexual development. His mother noticed
% K8 `5 W; P) a0 c! S Llight colored pubic hair development when he was
; X# H! V. U7 v$ h5 V3 N5 eFrom the 1Division of Pediatric Endocrinology, 2University of
; V1 w) g; ?1 F! J H8 GSouth Alabama Medical Center, Mobile, Alabama." x$ a9 L6 f$ x( q
Address correspondence to: Samar K. Bhowmick, MD, FACE,
; S0 \' Y1 g3 J! u5 l* RProfessor of Pediatrics, University of South Alabama, College of# s" p( l2 y, L/ x ^0 L' V
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
/ D. Z+ F( f4 t# x, e6 Ze-mail: [email protected].$ F6 m: x% K7 W# _- N
about 6 to 7 months old, which progressively became
5 j) [( l4 M! f* j* M3 y" o1 Edarker. She was also concerned about the enlarge-9 [/ r2 V4 f0 y5 j z6 i& ? [! p
ment of his penis and frequent erections. The child
1 \, U0 f3 J6 F% a% y: n) kwas the product of a full-term normal delivery, with; I/ J- p9 k' B* C. K
a birth weight of 7 lb 14 oz, and birth length of( {/ k/ t3 h& v3 E' W+ j( j {- I+ ]
20 inches. He was breast-fed throughout the first year3 E+ o' i! v2 G4 R
of life and was still receiving breast milk along with
5 f% w6 V: h0 Z3 ]' Ssolid food. He had no hospitalizations or surgery,3 |+ B" P J9 ~ l4 @# Q0 m! Z
and his psychosocial and psychomotor development& b+ O( k& U4 N. k
was age appropriate.: M$ n# D; g* j6 `6 {
The family history was remarkable for the father,4 f7 F$ k- f* l% m) E3 O$ \
who was diagnosed with hypothyroidism at age 16,
. G; }- q! l! k: h' A5 _which was treated with thyroxine. The father’s
. u3 @: C6 s; r% v Vheight was 6 feet, and he went through a somewhat/ U% Z( g. y6 \) r$ J! W7 f% @
early puberty and had stopped growing by age 14.3 ?7 @* T, T5 L9 n! P- }
The father denied taking any other medication. The5 b _1 U M# M
child’s mother was in good health. Her menarche
" m$ m* t+ d1 S7 Cwas at 11 years of age, and her height was at 5 feet
2 ?- B( C7 e, W2 x* x# o: x5 inches. There was no other family history of pre-: P/ P7 c$ R! [
cocious sexual development in the first-degree rela-, D! C3 I) C' R! o2 i* U
tives. There were no siblings.
/ x7 A2 a3 D# X! j: D7 p5 z- pPhysical Examination9 U( o+ F7 X8 X6 T
The physical examination revealed a very active,
% f% Z1 O+ Z8 iplayful, and healthy boy. The vital signs documented
. U8 X5 M6 j3 b* E% ~a blood pressure of 85/50 mm Hg, his length was
4 N9 D! N0 P/ d: s" S5 q90 cm (>97th percentile), and his weight was 14.4 kg/ F n5 l3 C3 q/ Z) B
(also >97th percentile). The observed yearly growth
! C' |% Z. z8 ^0 z$ R0 b: Z6 hvelocity was 30 cm (12 inches). The examination of6 i( Q0 I; n6 }9 E- y6 I
the neck revealed no thyroid enlargement.0 F/ ^* X. ~/ j- W# m
The genitourinary examination was remarkable for4 |4 Q4 e G: \) }& x1 ^. n' g _: c
enlargement of the penis, with a stretched length of
! ~* g+ D) H4 q" g8 cm and a width of 2 cm. The glans penis was very well" G0 T% g7 u* }9 {, \
developed. The pubic hair was Tanner II, mostly around( Y$ n& h( x2 ~4 V
5407 e1 [. o( }1 {3 E# `9 a
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from0 c6 s; b4 ~8 t& k
the base of the phallus and was dark and curled. The# O+ W \/ ^/ U) ]8 p% V; c! A: X
testicular volume was prepubertal at 2 mL each.6 R5 _# r" z' v2 t) F! Z9 E8 A/ Z. z
The skin was moist and smooth and somewhat
/ i, {) Z* A2 b( _9 g J; ^( Boily. No axillary hair was noted. There were no
p( g5 [* F7 P' ]abnormal skin pigmentations or café-au-lait spots.- Y! W) o8 G* s% X
Neurologic evaluation showed deep tendon reflex 2+
' j, W4 m, s$ g1 b# {7 O3 u* Cbilateral and symmetrical. There was no suggestion
9 {. J9 c- ~4 @* {/ M/ b7 h3 q$ Iof papilledema.2 p! P7 V0 {4 G1 n) n
Laboratory Evaluation
0 {3 e3 {' T- g- K) M$ S/ @The bone age was consistent with 28 months by
& `# S8 F# y1 P! D( l/ Vusing the standard of Greulich and Pyle at a chrono- I7 M h$ Y( _* N
logic age of 16 months (advanced).5 Chromosomal- L* @ N/ p+ p3 z% P7 I
karyotype was 46XY. The thyroid function test
1 S( Z- r: m* K$ k. ^' Pshowed a free T4 of 1.69 ng/dL, and thyroid stimu-8 F& K; |$ G* R
lating hormone level was 1.3 µIU/mL (both normal).
; x, k! R: N; F- h" pThe concentrations of serum electrolytes, blood( o. F# b! _% ]; W
urea nitrogen, creatinine, and calcium all were3 Y9 I6 _8 [& ^
within normal range for his age. The concentration. T- U- j6 e6 T
of serum 17-hydroxyprogesterone was 16 ng/dL/ v i" |7 _# s$ z
(normal, 3 to 90 ng/dL), androstenedione was 20' j3 n9 A5 U" J! W' R
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-% Y/ r' [: M* W3 C
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
8 K/ X' H/ a: ]* U+ cdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
6 D4 z; H* u% x V) u+ @2 ^" J49ng/dL), 11-desoxycortisol (specific compound S)
. T7 m, F1 Q0 _0 v! Z7 }0 vwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-: W! ~8 @% R/ s m; y( ?7 j
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total2 Z: o+ i. v: B, _: H
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
. M- F2 d7 ^' N& Yand β-human chorionic gonadotropin was less than
9 s+ `3 X, H6 `. W3 Q5 mIU/mL (normal <5 mIU/mL). Serum follicular( J" S" m7 S9 R
stimulating hormone and leuteinizing hormone. M" _; C ^ t) U
concentrations were less than 0.05 mIU/mL- G7 f. d4 g8 P) g+ \5 p# z
(prepubertal).- K- P9 ?0 t3 \9 K1 k2 X8 H. F" f
The parents were notified about the laboratory9 |: l3 h/ H$ G3 U
results and were informed that all of the tests were/ ]) ~ h, v9 d# b }/ z8 I6 l/ w
normal except the testosterone level was high. The0 i. Q7 l1 `5 Y4 h* q
follow-up visit was arranged within a few weeks to k- T% y! A7 M+ l7 x2 [) D
obtain testicular and abdominal sonograms; how-
2 i( Z& \1 M. [' S/ H9 lever, the family did not return for 4 months.
5 w( H$ c! R8 D! G( mPhysical examination at this time revealed that the
# { ]; P! s- b, Q+ r8 O! qchild had grown 2.5 cm in 4 months and had gained
; X' @0 l+ n% d! b8 q- I2 kg of weight. Physical examination remained
8 |! @& T7 H# @ D2 J# _unchanged. Surprisingly, the pubic hair almost com-! C/ u# ]& O* R, E+ x( R' m
pletely disappeared except for a few vellous hairs at/ g, i3 }# u! O+ {2 x5 v+ w
the base of the phallus. Testicular volume was still 2: c; t+ i, y0 g U" l
mL, and the size of the penis remained unchanged.8 H; y( ~; N3 B. E
The mother also said that the boy was no longer hav-
2 y; z8 t8 z( o. E( o0 r. C" Jing frequent erections.2 D# k1 [( m$ t7 g
Both parents were again questioned about use of
4 x* p5 b2 Y3 q( d9 R0 h: X. a1 tany ointment/creams that they may have applied to& s# u, T# T; X
the child’s skin. This time the father admitted the
! Q# n2 `5 J3 s* oTopical Testosterone Exposure / Bhowmick et al 541
! p- c, H* o2 e( X8 P# Euse of testosterone gel twice daily that he was apply-2 W* P5 I" O2 C' v" q& ^
ing over his own shoulders, chest, and back area for
. ]8 u% l0 s/ t( X: {; w0 }a year. The father also revealed he was embarrassed
9 K# W$ e5 V0 Q& l* a2 F- ~* D1 _to disclose that he was using a testosterone gel pre-
( F2 P3 X; C; Q5 Wscribed by his family physician for decreased libido1 ]7 z$ |1 O3 n$ w
secondary to depression.5 H# v3 g* Q5 ?3 W1 e6 y u- ?6 U: Z
The child slept in the same bed with parents.
4 J* g) Y7 s: I* n+ }4 J+ TThe father would hug the baby and hold him on his
: @+ D& K7 l5 E/ C3 w; ]' k$ [0 pchest for a considerable period of time, causing sig-
+ b+ @. [& e- `nificant bare skin contact between baby and father.9 y/ e, p6 Z- W2 d% c( D9 z
The father also admitted that after the phone call,5 {' p) r9 x, R# `
when he learned the testosterone level in the baby
8 b7 E/ B: s4 h3 |was high, he then read the product information
* r/ P4 M' d* Cpacket and concluded that it was most likely the rea-
5 e2 Y+ } l' n+ x; ~" R) k9 oson for the child’s virilization. At that time, they
6 m; I; u9 {9 Y3 Rdecided to put the baby in a separate bed, and the
3 r) @- y: ?2 S3 u6 Dfather was not hugging him with bare skin and had( o. X" O9 U2 T8 y$ W. f
been using protective clothing. A repeat testosterone- g- Q9 }8 z( a/ k! z& F0 v
test was ordered, but the family did not go to the
/ z# K. @6 W& ~+ X" ]$ p! Xlaboratory to obtain the test.
; U* \5 Y3 Q6 I r! bDiscussion' H9 w* x. O k( X- w% Z- l
Precocious puberty in boys is defined as secondary
6 I5 g1 i& v; t$ r* K' ?' zsexual development before 9 years of age.1,4& \% _" C7 M5 I& J% D; V" g# m' U0 s$ J7 r
Precocious puberty is termed as central (true) when1 X {! E! u$ ?, E& G
it is caused by the premature activation of hypo-2 Q6 i( I+ [ S0 L q" M& j1 C# W
thalamic pituitary gonadal axis. CPP is more com-
4 m+ R7 D: B) s3 B6 M5 F; pmon in girls than in boys.1,3 Most boys with CPP
+ p# M9 X8 Z4 a3 t5 I* h/ |may have a central nervous system lesion that is
- w$ C8 e7 g: S y( L! iresponsible for the early activation of the hypothal-
6 M! \5 C, n6 \9 Damic pituitary gonadal axis.1-3 Thus, greater empha-: a8 W6 H# x! f
sis has been given to neuroradiologic imaging in% ] H8 Q, n+ h1 m7 n4 e
boys with precocious puberty. In addition to viril- B3 e7 D( l- ?
ization, the clinical hallmark of CPP is the symmet-- k7 p2 o3 I, k7 ^
rical testicular growth secondary to stimulation by
& }+ }7 i, [% A' Y$ Vgonadotropins.1,37 b) P, f6 J$ p4 Y2 _% m( f. l
Gonadotropin-independent peripheral preco-" s% I! p7 b ?5 S( `$ ?' B4 j! z
cious puberty in boys also results from inappropriate
+ {* O3 w# {% A3 Gandrogenic stimulation from either endogenous or
/ E4 @' M/ G- V# _; s* j3 S" `8 Rexogenous sources, nonpituitary gonadotropin stim-9 X' R& {, L }
ulation, and rare activating mutations.3 Virilizing
( f' Z I0 j" U+ _congenital adrenal hyperplasia producing excessive
- v7 d6 E# W6 u$ Y/ |adrenal androgens is a common cause of precocious
# o" P' t+ h6 a0 z$ tpuberty in boys.3,4& E( _- e) `8 W& [& g& N$ b
The most common form of congenital adrenal
P/ @4 J @3 _! }+ z$ T$ Ehyperplasia is the 21-hydroxylase enzyme deficiency.
B4 N! E% R: r5 P$ U7 \' J1 X7 QThe 11-β hydroxylase deficiency may also result in9 j4 b9 r$ d# k& C& Z$ I
excessive adrenal androgen production, and rarely,
, w2 | d: M. ]* f' W$ K- Ean adrenal tumor may also cause adrenal androgen
$ K5 E. E G$ q# o# m" uexcess.1,3/ c9 t: n) R* @5 I; k. ^( W% T( ~
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
: S& ?! A: C v5 E5 Q" d542 Clinical Pediatrics / Vol. 46, No. 6, July 2007, H4 _9 A% S3 U$ U2 w* Q' s
A unique entity of male-limited gonadotropin-
! Z5 @6 B; \- G8 i. r& t% ^# Jindependent precocious puberty, which is also known' K5 M1 ^1 V P& w- k
as testotoxicosis, may cause precocious puberty at a
2 a Q/ i- _* A: m& `9 fvery young age. The physical findings in these boys
2 P0 l# C4 R$ F7 |: v3 y1 F+ W1 Ywith this disorder are full pubertal development,2 [1 m" Z5 a% y {' W4 e' c3 e% {5 `
including bilateral testicular growth, similar to boys
# s" e5 l) d. C; g- kwith CPP. The gonadotropin levels in this disorder
4 X! E% H1 P( care suppressed to prepubertal levels and do not show/ K/ t* s1 j+ W @( R; E# b
pubertal response of gonadotropin after gonadotropin-
/ q. V6 ~$ x, C* _; i3 @releasing hormone stimulation. This is a sex-linked: c! B3 h+ o+ A& E @3 Z1 }
autosomal dominant disorder that affects only
" M. M# W' s1 R9 G4 e, ^males; therefore, other male members of the family
# c" \+ |" r+ P/ ?may have similar precocious puberty.3
+ c% E( w" G" D7 @4 A4 U) E) v& S. zIn our patient, physical examination was incon-
3 q/ \1 [) _$ j$ J8 x# F4 X! h2 n# Nsistent with true precocious puberty since his testi-
% D6 |0 V1 u! E. qcles were prepubertal in size. However, testotoxicosis1 ?5 t+ [) ^) ]: s
was in the differential diagnosis because his father7 [8 ^. O* }5 X$ {
started puberty somewhat early, and occasionally,$ m8 W8 H) p+ u$ {
testicular enlargement is not that evident in the1 `; z1 H8 y" e5 \( S) P; W0 \
beginning of this process.1 In the absence of a neg-
) J4 `5 G& F( N0 f9 b* U" {9 lative initial history of androgen exposure, our4 d1 N7 E# g5 B2 |
biggest concern was virilizing adrenal hyperplasia,) M1 e( B0 f% Y6 C* a: \/ Y
either 21-hydroxylase deficiency or 11-β hydroxylase5 {$ q& s w, e+ e& U7 m
deficiency. Those diagnoses were excluded by find-0 w5 `2 G; y) [; Q1 ~
ing the normal level of adrenal steroids.; {* T* s' N u& L" J; B8 Z+ n
The diagnosis of exogenous androgens was strongly6 h6 q ^' n$ `) c
suspected in a follow-up visit after 4 months because
( W& S5 `$ N; x4 r: `' s% ?8 athe physical examination revealed the complete disap-$ Z; S `5 j: _4 ~# \% c6 J: \4 C' Q5 b
pearance of pubic hair, normal growth velocity, and# r, H: A: t7 Z* o" f
decreased erections. The father admitted using a testos-
+ P* o0 G) w' rterone gel, which he concealed at first visit. He was. H* K7 L _3 t/ w
using it rather frequently, twice a day. The Physicians’
0 M5 t7 G4 L6 q' pDesk Reference, or package insert of this product, gel or
! |" g# R @1 X0 D8 o# J8 Gcream, cautions about dermal testosterone transfer to
% I) @* |% \2 V( [, X$ v$ Vunprotected females through direct skin exposure.
( P" D) p1 }& ~8 s/ `Serum testosterone level was found to be 2 times the
9 O9 B+ k6 ?9 i) O% F7 X+ ], X/ cbaseline value in those females who were exposed to
8 B, ]( U, V% aeven 15 minutes of direct skin contact with their male2 Z7 P1 g* A0 f/ J2 A/ Y+ s( V
partners.6 However, when a shirt covered the applica-0 S2 r. n {# z6 ^8 W+ d2 a; j
tion site, this testosterone transfer was prevented.
: m# E& T6 P, wOur patient’s testosterone level was 60 ng/mL,
6 C- h! q/ ^; O5 twhich was clearly high. Some studies suggest that, E. `' [4 N7 e- j$ g) c: R
dermal conversion of testosterone to dihydrotestos-
! ?7 X" E9 W' c {% i4 Jterone, which is a more potent metabolite, is more' j8 g% P) m7 T1 j: Z* Z8 o+ @
active in young children exposed to testosterone& h. a* s: N4 z- w2 m! @
exogenously7; however, we did not measure a dihy-
1 K! p" T* y7 ~' L6 j& x! H# Odrotestosterone level in our patient. In addition to& l5 r5 M& K' c5 F, e) H) |
virilization, exposure to exogenous testosterone in
4 Q* i% y: J+ Lchildren results in an increase in growth velocity and) a& i% m7 B8 U# @
advanced bone age, as seen in our patient./ }# T5 o% I) k+ V# v. C
The long-term effect of androgen exposure during) E0 V& O# K$ S: R$ T' f9 n5 U& |& m
early childhood on pubertal development and final/ f$ j. Z( W/ P" d" s% R U6 t
adult height are not fully known and always remain
2 F4 }6 {( m9 xa concern. Children treated with short-term testos-
; q5 c# G7 c0 D- a% \+ h! yterone injection or topical androgen may exhibit some
4 G4 u6 J4 s3 l* h" g( }& cacceleration of the skeletal maturation; however, after
$ x- ~8 \% `% d: j1 U0 Q! [5 U5 rcessation of treatment, the rate of bone maturation
2 {) U' _+ T3 p- Fdecelerates and gradually returns to normal.8,9: k7 s) S5 S& w& f. D& ^7 N
There are conflicting reports and controversy
6 f3 `0 K5 c2 V( d$ Iover the effect of early androgen exposure on adult
! ~7 H* v2 F8 Fpenile length.10,11 Some reports suggest subnormal! B; y4 @- ?4 O
adult penile length, apparently because of downreg-
7 }0 A! w8 Y5 |; H7 k) {ulation of androgen receptor number.10,12 However,1 q/ z+ G- o2 r4 d S
Sutherland et al13 did not find a correlation between/ b: V/ k7 G/ L' a2 @1 P# X! D
childhood testosterone exposure and reduced adult
- T+ @3 d0 `- lpenile length in clinical studies.
) Z2 [! X& q! I4 O8 _- rNonetheless, we do not believe our patient is
8 B h& O4 R8 Q- ogoing to experience any of the untoward effects from, x8 K4 _, ^4 ]/ y
testosterone exposure as mentioned earlier because" G' S+ y. z8 |/ I
the exposure was not for a prolonged period of time.
1 z9 B9 f. Y! a0 lAlthough the bone age was advanced at the time of/ s" z8 q' K0 s* _: @
diagnosis, the child had a normal growth velocity at" Q* H r- V1 v; D$ `
the follow-up visit. It is hoped that his final adult$ {( l- x% K7 }! o4 Q. d q
height will not be affected." \7 F, z, d* L9 Z8 Y' Q6 F
Although rarely reported, the widespread avail-$ C) f7 J; s* W
ability of androgen products in our society may
, {; z- S ?" Z. yindeed cause more virilization in male or female
0 g( i1 z6 J5 \3 Z3 K6 e+ rchildren than one would realize. Exposure to andro-' T/ o# Z; i0 Q. ^
gen products must be considered and specific ques-
- f/ _% X8 p; ^' y; V" r1 [' Ationing about the use of a testosterone product or# g1 Q k5 I" y: w
gel should be asked of the family members during
a- n, C! N" V( @+ X4 @7 m) p- G+ |the evaluation of any children who present with vir-- R* @* P7 f p! ~$ B' B8 ~, |* z
ilization or peripheral precocious puberty. The diag-
+ @1 z) h6 K1 ?. W: }nosis can be established by just a few tests and by
+ `* z+ w& i& D6 e: n' A- iappropriate history. The inability to obtain such a% R, L: u; a& r/ u& e0 w a
history, or failure to ask the specific questions, may
- R2 i& V( ~: N/ b' B. _0 tresult in extensive, unnecessary, and expensive
1 I9 I" ~ z6 H' ~! t% Uinvestigation. The primary care physician should be' {/ x' i3 ]$ `8 u7 ~
aware of this fact, because most of these children+ j5 P9 l. Q7 T$ c8 j4 O7 e
may initially present in their practice. The Physicians’
" ?. |% y9 g) p9 ?- a4 ADesk Reference and package insert should also put a: N8 C- U7 `# R5 t' M5 T1 ^
warning about the virilizing effect on a male or
9 s h) P9 r( O# r( o! j$ cfemale child who might come in contact with some-
J+ y" n& {/ j' ]8 ?" tone using any of these products.
5 N4 y& Z3 S+ f2 D+ |! r7 cReferences
1 m! f) o; B2 v& L1 Z/ [6 t( m1. Styne DM. The testes: disorder of sexual differentiation3 F0 c! z, o/ W4 I( M6 E9 O) ~7 B
and puberty in the male. In: Sperling MA, ed. Pediatric6 [- j) L) M$ y- T
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;# o" x( p% y k4 n8 z
2002: 565-628.: T% i) W- r1 m! s* x
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
7 N, q, b$ c0 ^- W2 \& Mpuberty in children with tumours of the suprasellar pineal' g; Q7 m$ y& b
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Topical Testosterone Exposure / Bhowmick et al 543
' v, g0 @& L! `areas: organic central precocious puberty. Acta Paediatr.6 l6 F0 M8 u: ^, K# k; U
2001;90:751-756., ~: R0 K8 U2 K) m
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
1 ~# j7 @, f0 j. u5 i5 z) CPediatric Endocrinology. 4th ed. New York, NY: Marcel1 K9 O7 Y) t0 C. Y _
Dekker Inc; 2003:211-238.5 x: L! f/ z3 ?
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
: W, ~$ C& W: L" q! e: {development in a two-year-old boy induced by topical' @/ l* l6 n7 h( H) R3 Y* L5 \
exposure to testosterone. Pediatrics. 1999;104:e23.0 q6 N- }9 R4 Y* t
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
) w) ^$ ?+ R3 r9 Z# F3 i1 WSkeletal Development of the Hand and Wrist. 2nd ed.- {4 T3 ~1 u! I, l% j9 z
Stanford, CA: Stanford University Press; 1959.' ?4 G0 K- Q- N4 Q: @; K2 W
6. Physicians’ Desk Reference. Androgel 1% testosterone,% y1 u# {! m' e! x7 K" G
Unimed Pharmaceutical Inc. Montvale, NJ: Medical1 `; i0 K/ \9 h& T
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