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is a significant concern for physicians. Central" S4 a( A6 I# \) a0 M: j+ ]/ i
precocious puberty (CPP), which is mediated) a+ k& W4 p$ b! v0 b
through the hypothalamic pituitary gonadal axis, has" ?6 z/ z' ]8 q2 V
a higher incidence of organic central nervous system5 U/ S# {' n1 P) l! _- y' K
lesions in boys.1,2 Virilization in boys, as manifested1 L7 x2 E# y* u" m1 [
by enlargement of the penis, development of pubic1 L6 f2 M; P3 _3 j8 f
hair, and facial acne without enlargement of testi-# E4 K( ~- v- u5 \, X6 r
cles, suggests peripheral or pseudopuberty.1-3 We+ U9 _6 s+ a0 y( C/ @0 D8 m5 N
report a 16-month-old boy who presented with the: c7 E$ [! F- C
enlargement of the phallus and pubic hair develop-% f8 e( J$ ?$ ^/ r# B% c! A
ment without testicular enlargement, which was due
4 ^$ A' w' ^& P, M) qto the unintentional exposure to androgen gel used by
' N* Q. A, ?, q0 nthe father. The family initially concealed this infor-: W4 K* V7 l5 n) t0 ]
mation, resulting in an extensive work-up for this& l3 }# J8 ?) h, J7 S# {9 A
child. Given the widespread and easy availability of
7 M- G# b; ], K5 v) _) ltestosterone gel and cream, we believe this is proba-
4 D- H7 H+ ?. b5 v+ [' m1 Sbly more common than the rare case report in the/ Y- [. }+ u! t0 X
literature.4+ T h) A$ L% j% R
Patient Report+ E* K: ^" c5 d0 L
A 16-month-old white child was referred to the
0 C5 U8 K: s- g+ y% a9 B/ x2 ]endocrine clinic by his pediatrician with the concern
( H) s- Y1 `7 U: J5 n# j3 nof early sexual development. His mother noticed% Y F0 I2 R0 z$ j" {( l$ k) z
light colored pubic hair development when he was
2 E0 Y0 t. U( c$ d# qFrom the 1Division of Pediatric Endocrinology, 2University of# p9 I% Y. v# G8 H5 ?
South Alabama Medical Center, Mobile, Alabama.
, ?' f8 f8 I. \! w) |+ nAddress correspondence to: Samar K. Bhowmick, MD, FACE,
/ B9 m+ S* h! r X O$ ^: d; d& tProfessor of Pediatrics, University of South Alabama, College of m+ x6 n" t4 Q: w0 l6 M
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;4 X Z' b2 q/ k; Z3 q% D& i
e-mail: [email protected].
8 U6 ]( R, `- R) Z2 H. Xabout 6 to 7 months old, which progressively became' }9 X2 F# j9 i/ q9 t( _
darker. She was also concerned about the enlarge-8 p% F3 |" Y8 W4 ^* s) j6 I: }
ment of his penis and frequent erections. The child1 u4 `* }/ P8 T5 Q& k4 \
was the product of a full-term normal delivery, with
# I" q9 N, R* b* za birth weight of 7 lb 14 oz, and birth length of
6 D. a5 I# H# ~& p6 M" e1 L20 inches. He was breast-fed throughout the first year: {5 O. a4 ]; S: ]" k
of life and was still receiving breast milk along with
; W% t5 P1 D- B5 ]: | Isolid food. He had no hospitalizations or surgery,2 W8 v& R) X0 s( }/ q5 {
and his psychosocial and psychomotor development& V; P1 p7 {9 [9 T! d" N Y) k8 X
was age appropriate.
9 G+ ]- z; X ]; o- c) |The family history was remarkable for the father,
# ^2 G4 i$ s* [1 {+ ]0 Awho was diagnosed with hypothyroidism at age 16, |% I, X9 ~5 L/ p% q
which was treated with thyroxine. The father’s- d: C' u& m5 M# Y! \9 B) P$ i# I7 l9 I2 z
height was 6 feet, and he went through a somewhat
1 W t; x4 x9 }3 J! E' @4 i/ f2 @early puberty and had stopped growing by age 14.- X. d$ h! }1 `$ i! W
The father denied taking any other medication. The
3 a& [# m/ e+ [! ochild’s mother was in good health. Her menarche) k4 G5 ~' ?+ \. R
was at 11 years of age, and her height was at 5 feet
4 U% p( [; C9 h7 W+ @0 ~5 inches. There was no other family history of pre-; A$ J& c' K5 g4 N3 v$ \% K
cocious sexual development in the first-degree rela-
) P9 B6 k) B4 t9 Q$ Otives. There were no siblings.
9 E; v: S$ U, W/ m, S8 x$ u5 kPhysical Examination. A M- W& J3 W% K+ G5 F0 b
The physical examination revealed a very active,$ \# [/ h4 d t" ?: X
playful, and healthy boy. The vital signs documented
. M: z% F9 w# Ia blood pressure of 85/50 mm Hg, his length was
& J% J! F p' U) o8 Y( }6 W90 cm (>97th percentile), and his weight was 14.4 kg6 m7 o7 R; Z! {+ [- d
(also >97th percentile). The observed yearly growth3 k& i" s) n( r6 q3 r6 j9 P: b
velocity was 30 cm (12 inches). The examination of6 t2 K8 x2 W# A. b* @5 c& K& t( Z- L
the neck revealed no thyroid enlargement.$ k* S# E& N, ^" ^+ ?
The genitourinary examination was remarkable for
( s! l2 g5 n q w7 b$ \' tenlargement of the penis, with a stretched length of
: x$ Z2 R6 G9 W; z8 {! t" A8 cm and a width of 2 cm. The glans penis was very well( r, f2 [& y" T1 R3 y( m" N' l
developed. The pubic hair was Tanner II, mostly around
4 a1 R$ [; h, a5 p6 Q540. T9 |+ c9 w4 l
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
9 B4 `! l; Y! S6 M4 g1 Wthe base of the phallus and was dark and curled. The& S+ A3 ^1 z7 p( K! S/ O' t
testicular volume was prepubertal at 2 mL each.9 E! p4 J$ \( h! s) m) K
The skin was moist and smooth and somewhat3 k: z# G9 C- I, l6 \
oily. No axillary hair was noted. There were no- X$ ]0 a' Y' q5 P0 d
abnormal skin pigmentations or café-au-lait spots.
4 B3 a* b% [- u; b, J) |) KNeurologic evaluation showed deep tendon reflex 2+' ]" k. [) G- j4 v9 z
bilateral and symmetrical. There was no suggestion
, J' D. B( v0 l/ M& Wof papilledema.
# g4 N$ f+ S, ~ B5 u+ hLaboratory Evaluation9 _1 t, ~& @& }1 ?: x2 e
The bone age was consistent with 28 months by' o l5 ^. t4 s* t
using the standard of Greulich and Pyle at a chrono-& A5 f g. N: p* t9 I: u+ \: c9 x
logic age of 16 months (advanced).5 Chromosomal
8 ^4 W( L# ~, a# t. y- ^, ~0 bkaryotype was 46XY. The thyroid function test3 v% `& s/ ]7 Q; [, W
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
8 u! x1 l0 S# H7 ~1 Ilating hormone level was 1.3 µIU/mL (both normal).
; g7 [* P d& _, {: u9 IThe concentrations of serum electrolytes, blood0 ?& d! C m/ e- l, S
urea nitrogen, creatinine, and calcium all were
# Y# t* c2 D8 a0 y8 h0 c# M9 {# T3 ^within normal range for his age. The concentration% ^ I6 |& L" a9 K
of serum 17-hydroxyprogesterone was 16 ng/dL
) q E6 R) X, ](normal, 3 to 90 ng/dL), androstenedione was 20$ w' L# C* E- W ?1 b; r( _4 p. F
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-( N* q! V7 W' ?: E3 i8 L$ J% x
terone was 38 ng/dL (normal, 50 to 760 ng/dL),- O9 t6 J! S' Z' r! O2 V
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
7 m) S, Q9 h/ V" D0 r8 i49ng/dL), 11-desoxycortisol (specific compound S)& J, B9 k: G- T9 u5 m% V
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-& w2 U2 f5 X1 t/ X
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
( `8 i z6 ?; ~testosterone was 60 ng/dL (normal <3 to 10 ng/dL),% p* k# \7 z" I
and β-human chorionic gonadotropin was less than) e6 F$ J9 i7 [$ I. k3 l
5 mIU/mL (normal <5 mIU/mL). Serum follicular
; [7 `0 Z8 E: ]! w0 y5 ]9 D: }" {- jstimulating hormone and leuteinizing hormone
* g: B% [ i0 O4 U* N6 bconcentrations were less than 0.05 mIU/mL K- d9 w* W7 x. I; V. G6 E
(prepubertal).
4 V3 C& Y1 D( ^% p9 J9 k+ CThe parents were notified about the laboratory
4 t1 z: P3 w. Oresults and were informed that all of the tests were5 L/ l0 U) h; r) f: U
normal except the testosterone level was high. The
B d- X0 ~- p7 `' x1 ^% Ofollow-up visit was arranged within a few weeks to% [: [- q' Q7 F5 L, J% ]
obtain testicular and abdominal sonograms; how- E* y# i; m6 ?( z7 @& j' C
ever, the family did not return for 4 months.3 o# h# ]& E( Z9 e2 c
Physical examination at this time revealed that the) Y% y: h: m. }: s- \
child had grown 2.5 cm in 4 months and had gained
% _/ }' D0 o2 b9 q% h! F# ~4 O2 kg of weight. Physical examination remained
9 Y$ b! h& y' V5 l, E+ A: d8 dunchanged. Surprisingly, the pubic hair almost com-
4 F. p0 b7 {- O; _pletely disappeared except for a few vellous hairs at% h5 Q- g t! K# T: ]
the base of the phallus. Testicular volume was still 2$ i* X& D; K$ g% ?; ^
mL, and the size of the penis remained unchanged.
. S6 D+ u, ]! B. J2 v+ uThe mother also said that the boy was no longer hav-; n' `) ~+ h5 X! ~" e
ing frequent erections., a4 q4 R& }4 _2 F+ ]4 n( w
Both parents were again questioned about use of
; |# N- X! j7 G% F/ n4 Uany ointment/creams that they may have applied to/ F6 p9 p# t! c, Y2 z- N% p& e
the child’s skin. This time the father admitted the2 ]# c; w7 Q) e% y1 G: [
Topical Testosterone Exposure / Bhowmick et al 541
4 i) R& ^$ C4 F$ k, r3 ~8 @+ nuse of testosterone gel twice daily that he was apply-
3 H. ^1 P1 w3 |/ j$ g; W" qing over his own shoulders, chest, and back area for
' U7 o- s. e! f/ Na year. The father also revealed he was embarrassed
2 V6 i( ^4 w( L/ n* `to disclose that he was using a testosterone gel pre-
5 U# K( B* g& @* Y/ s! H @, Z% o2 H1 \scribed by his family physician for decreased libido% S$ |' F2 g1 X$ U, h' B1 P& y; T( ?
secondary to depression.; W+ ?5 l- v+ e/ l
The child slept in the same bed with parents.0 b" l. X' O3 k. R* G# O
The father would hug the baby and hold him on his- C+ [4 m2 v2 z' E! i' ~6 ^
chest for a considerable period of time, causing sig-
, I! ~* G: o+ G3 j% inificant bare skin contact between baby and father.7 F1 @8 |# m: |9 {/ |2 p- A5 G
The father also admitted that after the phone call,
3 {5 | U. r# `' f& d1 D( Gwhen he learned the testosterone level in the baby
+ e9 n# Q2 M5 s& Lwas high, he then read the product information7 e4 l, R$ j9 n- i5 d z; I2 J( ~4 I
packet and concluded that it was most likely the rea-
2 `- r' |6 q% u# G+ ?+ gson for the child’s virilization. At that time, they4 }) ]( z U: N: l
decided to put the baby in a separate bed, and the
7 ?2 h, `7 S' Q' s! o3 Ifather was not hugging him with bare skin and had) U" E0 }5 I$ F# `" p
been using protective clothing. A repeat testosterone3 b5 i6 k/ L; Q. b
test was ordered, but the family did not go to the3 \- M/ t7 e) Y# H# L
laboratory to obtain the test.
! `, J# G6 b, j! L$ k5 fDiscussion
8 A, H6 S7 {6 |Precocious puberty in boys is defined as secondary- _. ?# l0 y3 T% G/ h6 j
sexual development before 9 years of age.1,4
I, M& T# t5 O+ z+ NPrecocious puberty is termed as central (true) when
( g$ V- @; [" v! wit is caused by the premature activation of hypo-5 p3 C4 M! T: u
thalamic pituitary gonadal axis. CPP is more com-4 P8 `" e, o8 s& t
mon in girls than in boys.1,3 Most boys with CPP1 Y2 U5 b( }+ @- R& r- s
may have a central nervous system lesion that is
* a/ m" i0 I. n8 V) z! Kresponsible for the early activation of the hypothal-" c# Q* |) `: z
amic pituitary gonadal axis.1-3 Thus, greater empha-# [7 k1 \+ M3 B1 o8 J0 ^8 x
sis has been given to neuroradiologic imaging in
: L( Z/ Z: p" c+ X2 p$ T& @boys with precocious puberty. In addition to viril-
* X: ^, g& U& |* |ization, the clinical hallmark of CPP is the symmet-: G/ e1 M7 I- @
rical testicular growth secondary to stimulation by
7 h* v' F$ A, hgonadotropins.1,33 e- K% ^0 t# b" D
Gonadotropin-independent peripheral preco-
$ ^( S/ L0 G4 s, bcious puberty in boys also results from inappropriate
3 b5 M0 }% V% Y5 j1 h0 K2 c/ aandrogenic stimulation from either endogenous or4 L2 R3 ]) R: `( o# ^2 W
exogenous sources, nonpituitary gonadotropin stim-% M% |) [0 d( Z
ulation, and rare activating mutations.3 Virilizing, o( { C8 q: P
congenital adrenal hyperplasia producing excessive
. P/ Z) \$ w* O+ t' k9 D' |adrenal androgens is a common cause of precocious
4 ]& V! Z( E/ X% `puberty in boys.3,4* u: k; b7 C5 @( ?# ?- C
The most common form of congenital adrenal+ g5 F; Y' E) a. s& q
hyperplasia is the 21-hydroxylase enzyme deficiency.
0 p' u- ~2 @8 p2 E n/ |The 11-β hydroxylase deficiency may also result in
4 E& E+ v6 W4 k$ jexcessive adrenal androgen production, and rarely,
9 M: v; _, S3 ian adrenal tumor may also cause adrenal androgen& U) D1 j% o) u5 m( e. j+ D
excess.1,3
# G0 o) f- W" z, X% J' Xat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from6 K/ I' C6 A$ O: V& \, n+ }6 B
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
" {, N2 w4 k6 \A unique entity of male-limited gonadotropin-
" r w# |3 M' C: Rindependent precocious puberty, which is also known
% N& J/ x' i8 S# p' X( }5 zas testotoxicosis, may cause precocious puberty at a; e% a& m; r, N6 h' J1 A( s
very young age. The physical findings in these boys y6 X( x5 |) `; t4 [1 V
with this disorder are full pubertal development,# I. J" w* t$ B3 l
including bilateral testicular growth, similar to boys
. w7 Z) ^" `- Zwith CPP. The gonadotropin levels in this disorder' F2 q* O- ?" z6 L* w7 i/ P
are suppressed to prepubertal levels and do not show2 w9 D9 x d8 r) i; v
pubertal response of gonadotropin after gonadotropin-
$ ?9 r) d+ [; M! b; H) \9 S B D/ j" Greleasing hormone stimulation. This is a sex-linked
8 ]6 O g6 c- u$ q+ U: R. sautosomal dominant disorder that affects only& L, g& e, x4 _
males; therefore, other male members of the family8 g$ I! Q2 @2 Q$ Z( Q' F4 @- \
may have similar precocious puberty.3
8 M* P# ~/ f* d% Y) AIn our patient, physical examination was incon-
3 q1 S8 [) X4 l" h7 y! T# N' w" Xsistent with true precocious puberty since his testi-5 T8 S# `7 P) w. v3 J$ X. Z
cles were prepubertal in size. However, testotoxicosis; ?. F8 X$ \& I2 y. z# a9 F
was in the differential diagnosis because his father
( B# j5 c' w: b7 Dstarted puberty somewhat early, and occasionally,
# N& ^- W! N7 _0 V, C- x1 ztesticular enlargement is not that evident in the' _: }9 c ?0 a! [
beginning of this process.1 In the absence of a neg-
/ [5 M! `) ]: M( A. |9 p: lative initial history of androgen exposure, our' X4 X5 U( {& \: Q3 _$ A
biggest concern was virilizing adrenal hyperplasia,
e7 I1 `9 G# x2 xeither 21-hydroxylase deficiency or 11-β hydroxylase
( k8 ^! k. I( }deficiency. Those diagnoses were excluded by find-
6 b4 _- {* T* c: A1 W l" wing the normal level of adrenal steroids.
4 n) k [8 H9 p: B5 ]The diagnosis of exogenous androgens was strongly- k, B! G' T! A9 D8 l4 }" F
suspected in a follow-up visit after 4 months because
& j6 \( E8 f: p: N7 ^2 Uthe physical examination revealed the complete disap-
5 L7 w) s! s9 f V8 K$ ~' q' Qpearance of pubic hair, normal growth velocity, and+ Y! B8 j* \# @# m" {8 o
decreased erections. The father admitted using a testos-
( E I0 Z Z" u4 Y A1 k) g5 E: ]terone gel, which he concealed at first visit. He was
9 T1 V6 {) f! F% U; P0 a# E) G/ g& susing it rather frequently, twice a day. The Physicians’8 z4 Q" I5 S+ @5 S& h
Desk Reference, or package insert of this product, gel or
' i {. o' m9 ~, {2 N: gcream, cautions about dermal testosterone transfer to: C& @/ r9 Y% w+ W4 f! D8 J4 @- k
unprotected females through direct skin exposure.! A) }2 ?1 T3 q: j
Serum testosterone level was found to be 2 times the g" ~! C" k7 T: Z
baseline value in those females who were exposed to1 U) m7 U* _+ |
even 15 minutes of direct skin contact with their male
/ P) g. M$ |; y: X8 j2 d. l) U2 Jpartners.6 However, when a shirt covered the applica-' U" ? Q8 l( _* B1 T
tion site, this testosterone transfer was prevented.
: e9 T. M3 C+ z- e9 i: V7 T+ |7 COur patient’s testosterone level was 60 ng/mL,3 @; \0 Q0 \8 G
which was clearly high. Some studies suggest that. N5 b, }7 a( j$ k3 i7 S) _# S* f
dermal conversion of testosterone to dihydrotestos-8 C6 L$ }; L7 k' N0 t8 ]4 @
terone, which is a more potent metabolite, is more+ V. p: N# U C
active in young children exposed to testosterone
0 T; }# S! `% x0 g; A5 t6 Eexogenously7; however, we did not measure a dihy-
- s# T; B1 q5 Y& d+ }5 ~drotestosterone level in our patient. In addition to/ z/ `1 y- l; f" C' {" T6 X! x
virilization, exposure to exogenous testosterone in3 B* @# Y j# H% n* X N. K- W
children results in an increase in growth velocity and& D i2 H% O/ Z9 l9 r
advanced bone age, as seen in our patient.
. i: h& _. A4 e- iThe long-term effect of androgen exposure during2 i1 I0 Y- E. t. a+ v
early childhood on pubertal development and final8 P0 W/ L* G; \
adult height are not fully known and always remain+ f: e/ z" Q0 z! c: Q1 l
a concern. Children treated with short-term testos-
$ P1 A4 I+ M& y: v" f4 |" lterone injection or topical androgen may exhibit some
& Y" ?4 V. C. S$ b0 r9 ~# Yacceleration of the skeletal maturation; however, after
& D8 z9 M( m2 o3 P/ W/ Bcessation of treatment, the rate of bone maturation
9 }( V' _$ J, R8 ` Fdecelerates and gradually returns to normal.8,9( [; D# I2 S1 ~5 j" o9 T% f
There are conflicting reports and controversy) U- n; p9 L5 P; X8 I c1 ^2 x0 w
over the effect of early androgen exposure on adult
& O) q" o; Q6 u# U9 kpenile length.10,11 Some reports suggest subnormal9 L# e. _& z3 |/ j7 k8 K
adult penile length, apparently because of downreg-' k! g* f& h7 K$ P N
ulation of androgen receptor number.10,12 However,
5 A" |' M2 z& k" I3 T$ D$ X/ qSutherland et al13 did not find a correlation between
* l+ a9 C$ G1 p; m3 |childhood testosterone exposure and reduced adult
* G/ g' L0 d7 Z1 g9 Z! qpenile length in clinical studies., G ]6 }7 Y& |/ E, E
Nonetheless, we do not believe our patient is' P7 F% O7 f5 O" ~9 V9 f0 G' _8 ?
going to experience any of the untoward effects from. c5 B B$ B# o9 r. O
testosterone exposure as mentioned earlier because. V. L, F7 ^% ~/ F1 v
the exposure was not for a prolonged period of time.3 B& Y2 i0 C# d3 ?
Although the bone age was advanced at the time of
. z; w/ x m. H; vdiagnosis, the child had a normal growth velocity at. t4 i" V' Y: L
the follow-up visit. It is hoped that his final adult
7 q! z k$ M3 f( U3 Mheight will not be affected.
6 I$ N& R8 ~# a1 w$ VAlthough rarely reported, the widespread avail-
5 O6 R6 V. m: O+ k# m* c' J9 Fability of androgen products in our society may; F/ ]% u9 {* ]) L8 c. S
indeed cause more virilization in male or female
e j; {/ n4 tchildren than one would realize. Exposure to andro-
9 x/ j, w1 e3 r0 k! mgen products must be considered and specific ques-# J* I7 g/ o3 W
tioning about the use of a testosterone product or6 A4 Z4 E9 Y `" D8 H
gel should be asked of the family members during
" W0 x7 |6 O9 J4 B6 s" ?, I( lthe evaluation of any children who present with vir-
4 _" m& K7 z J( Zilization or peripheral precocious puberty. The diag-
8 w2 A* H1 o# H( P! M6 A0 Jnosis can be established by just a few tests and by
5 L: H8 }& F* |) K4 f- Cappropriate history. The inability to obtain such a$ P5 U' H3 }- | A! q
history, or failure to ask the specific questions, may
1 o- i& I$ s8 E5 u' h. Eresult in extensive, unnecessary, and expensive
9 L6 y( n+ C; d8 v% Hinvestigation. The primary care physician should be+ x8 J/ x: k8 k' O
aware of this fact, because most of these children
& }/ L4 h* f# R3 x0 h4 Pmay initially present in their practice. The Physicians’
& i2 U, r6 g4 E: f; H, SDesk Reference and package insert should also put a
- e( A k: b) i+ o" v' X& R v) L% P, Cwarning about the virilizing effect on a male or5 a7 @( I' V: [& a+ h% D h2 A
female child who might come in contact with some-
9 ^% }& _! r9 E& _! d5 H* }3 J# aone using any of these products.
/ Q3 X2 o2 s& X! S7 o3 P; fReferences9 W" V3 M4 p3 n; K4 j6 F
1. Styne DM. The testes: disorder of sexual differentiation$ x) e9 a; Q$ ^$ ~$ O% V
and puberty in the male. In: Sperling MA, ed. Pediatric% X# A6 Y1 q5 K3 _" ?
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;; ^& l7 \( Q9 }9 P& H
2002: 565-628.' C l* Q6 f i
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious% c( `7 M3 l: _, Y% [) m5 J
puberty in children with tumours of the suprasellar pineal F* u( r v; U* O/ k$ k
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from' X8 N- |# I- B+ r
Topical Testosterone Exposure / Bhowmick et al 5438 u; K- C \( @/ s" N [4 \) F
areas: organic central precocious puberty. Acta Paediatr.) `* u6 y- {* Z+ P4 G9 n
2001;90:751-756.' x3 a8 l) j; x3 r; t( u* G
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.2 x2 ^# L$ q: i
Pediatric Endocrinology. 4th ed. New York, NY: Marcel
4 k3 D: l+ s4 U3 r# M* _6 yDekker Inc; 2003:211-238. s5 x7 ?6 s) U, M: w4 v$ S
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual6 G/ Y' ]# H, |0 r7 m
development in a two-year-old boy induced by topical* p3 _+ D, H& k% ?- c0 ~. x
exposure to testosterone. Pediatrics. 1999;104:e23.6 r/ y7 g8 x+ a+ y
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of3 |$ C, Q4 E- n1 P' b1 P
Skeletal Development of the Hand and Wrist. 2nd ed.+ M* q% u9 _* m; a
Stanford, CA: Stanford University Press; 1959.
0 |+ c( d( E0 t6. Physicians’ Desk Reference. Androgel 1% testosterone,
8 ?" F" X$ S3 } H% OUnimed Pharmaceutical Inc. Montvale, NJ: Medical& i8 w8 S0 h6 ?6 D5 F
Economics Company, Inc; 2004:3239-3241.+ A$ ?( _, {7 i) s9 N. U* r
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