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is a significant concern for physicians. Central
7 _" H2 U; H; l) A4 z! pprecocious puberty (CPP), which is mediated
$ @# w3 F4 D5 `& b$ s- `( }through the hypothalamic pituitary gonadal axis, has* Q' I. _( A7 p5 Q
a higher incidence of organic central nervous system
& T+ F9 g2 V! G. o% Plesions in boys.1,2 Virilization in boys, as manifested
' o( ~' P. \: X" O' v! {by enlargement of the penis, development of pubic
( K+ B' b# |0 ~% G$ Zhair, and facial acne without enlargement of testi-0 K) L% w9 U- t# S) F8 |
cles, suggests peripheral or pseudopuberty.1-3 We r" d) f0 W6 z! w/ i
report a 16-month-old boy who presented with the2 J; Q/ C2 S6 {
enlargement of the phallus and pubic hair develop-! J* `2 Y$ K$ q8 Z! r. V1 |
ment without testicular enlargement, which was due- s4 Z$ a Z: y y% Z
to the unintentional exposure to androgen gel used by) T; R9 \/ ]- s2 I) S$ ~7 e/ D
the father. The family initially concealed this infor-, K5 [3 ^) K' N: T! O$ t
mation, resulting in an extensive work-up for this3 T, n- T" O* K, G4 u( [9 {+ c% l7 t
child. Given the widespread and easy availability of
8 h2 U. o" t' i0 c% Q3 t& Ltestosterone gel and cream, we believe this is proba-% {; a5 U- |2 r1 U. q! A/ }- z
bly more common than the rare case report in the
$ S3 q3 V9 l. O6 J- s- Qliterature.4- d# r9 O* X5 H8 T
Patient Report
# u) F+ K, ?/ ?, \: l' VA 16-month-old white child was referred to the
' b. Y! s0 `+ D6 [: k' u7 h& Pendocrine clinic by his pediatrician with the concern' }( J. V1 |& W& X0 H
of early sexual development. His mother noticed4 d, L5 H {5 d8 x& {* \; }2 ]
light colored pubic hair development when he was# j' d$ `+ z. i' R$ Q
From the 1Division of Pediatric Endocrinology, 2University of c/ Y0 B9 ~6 H! {9 `2 D7 {2 j7 q, b
South Alabama Medical Center, Mobile, Alabama.
9 p, F" f8 \/ m4 b8 n7 O0 BAddress correspondence to: Samar K. Bhowmick, MD, FACE,) L% Q3 m1 D/ _8 l' l& I7 F
Professor of Pediatrics, University of South Alabama, College of0 M& N" [$ z7 v( S; N
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;: M( e. ]* ?. x, L
e-mail: [email protected].
% H' I; x! k f3 K, Mabout 6 to 7 months old, which progressively became& B& z7 p1 k# ~6 B9 U
darker. She was also concerned about the enlarge-
' U2 P' _* n: y3 ?ment of his penis and frequent erections. The child
6 w! J1 q7 j6 D3 l/ c0 z! O5 V- q7 S+ ^7 Fwas the product of a full-term normal delivery, with2 K0 ^/ \# C$ g2 h9 h
a birth weight of 7 lb 14 oz, and birth length of
# j7 Q) b. o/ l3 B8 X( c20 inches. He was breast-fed throughout the first year
* q' {! g2 l* d. w3 ?( Y7 z! ?of life and was still receiving breast milk along with) H8 M# w" Q; n+ f7 z: \, k6 J
solid food. He had no hospitalizations or surgery, X" |0 ~3 I. S7 y7 l5 n
and his psychosocial and psychomotor development
2 ?) N" _6 y8 q# ewas age appropriate.! \+ ^( Q* o" u) G* L! Y( Q; B
The family history was remarkable for the father,8 {$ [; }/ ? C6 M3 F1 P$ P2 I0 U
who was diagnosed with hypothyroidism at age 16,
' ^+ X% O: t3 h6 G) N* a- ywhich was treated with thyroxine. The father’s9 C5 k; n g& E3 r
height was 6 feet, and he went through a somewhat) ^0 r- x6 @! ]) M/ {
early puberty and had stopped growing by age 14.% R4 E% C4 x1 ~8 ^' F4 o5 ?
The father denied taking any other medication. The
4 ~+ d* G5 h U# g: qchild’s mother was in good health. Her menarche
0 m3 ] v; _1 a5 U1 o8 `was at 11 years of age, and her height was at 5 feet
2 ~" M( \2 L5 [( ^! \ I5 inches. There was no other family history of pre-' P3 W) q- h2 w% U8 q
cocious sexual development in the first-degree rela-$ p$ q8 H" T0 c+ }
tives. There were no siblings.1 h- f6 J& d) L" ~
Physical Examination
& U2 ^& Y3 L& uThe physical examination revealed a very active,
0 |2 U7 x' M4 Z% d9 dplayful, and healthy boy. The vital signs documented
% x' l9 t' d2 _" h! Ja blood pressure of 85/50 mm Hg, his length was
( e8 _8 Y0 [' ~90 cm (>97th percentile), and his weight was 14.4 kg
7 ^5 r# r* O$ E: n0 Y, J$ m7 {8 S(also >97th percentile). The observed yearly growth
% }' t9 C7 p- v8 n2 Wvelocity was 30 cm (12 inches). The examination of9 B H) H# p1 C1 X# j
the neck revealed no thyroid enlargement.
' J' S6 J( ]: }& q" y$ @ zThe genitourinary examination was remarkable for6 D& E% X: R' r. j& j6 j9 \4 F
enlargement of the penis, with a stretched length of+ J4 V6 m' q e; G' M& z
8 cm and a width of 2 cm. The glans penis was very well. `0 ^3 H- K5 _1 h
developed. The pubic hair was Tanner II, mostly around/ C9 ~+ r0 W5 R" u2 ^: K* q1 W, F* G
540
t2 g+ F3 F# ?1 P# z9 L7 T% uat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from& l0 Q" p- P9 P& T
the base of the phallus and was dark and curled. The$ d, r, o) F8 g! ]1 W
testicular volume was prepubertal at 2 mL each.$ y0 A: E' P% _, r( w/ ]
The skin was moist and smooth and somewhat( \( c9 S o6 V+ ?9 C
oily. No axillary hair was noted. There were no
% G- T, a6 U' c% A' }abnormal skin pigmentations or café-au-lait spots.9 V# F A$ {! k7 D* T0 t' ?7 b
Neurologic evaluation showed deep tendon reflex 2+
; N1 a* Y# N& O! n1 ~4 ]6 Gbilateral and symmetrical. There was no suggestion
+ U3 D: A6 Y/ hof papilledema.
: q% Z' E% L3 z3 t6 x8 y7 C8 \Laboratory Evaluation V8 e2 J! ?3 K
The bone age was consistent with 28 months by
3 Y) e; D3 \ z1 Uusing the standard of Greulich and Pyle at a chrono-1 D( W7 t: n3 H" S( f
logic age of 16 months (advanced).5 Chromosomal- G1 D) D5 y+ N8 u2 G
karyotype was 46XY. The thyroid function test0 I0 L& N8 v# D2 L6 a3 Q8 \" S
showed a free T4 of 1.69 ng/dL, and thyroid stimu-! B1 I6 [ @: ]. w1 |# L2 w
lating hormone level was 1.3 µIU/mL (both normal).+ J/ r0 m% Q8 I k# ]
The concentrations of serum electrolytes, blood
: d6 B% v i, y4 Surea nitrogen, creatinine, and calcium all were# m8 D4 w7 e4 T
within normal range for his age. The concentration, @- X' v) U" x! y7 O
of serum 17-hydroxyprogesterone was 16 ng/dL4 W# `' Z( k% u0 I; @- F2 ?
(normal, 3 to 90 ng/dL), androstenedione was 20
6 J" K+ q _: zng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
' I. J8 P+ z& c) t1 G2 aterone was 38 ng/dL (normal, 50 to 760 ng/dL),. h: y8 v7 W- z2 d! H: r
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
5 o; Z( b0 M. E: e/ r( h49ng/dL), 11-desoxycortisol (specific compound S)
7 f! E. K- ~, ~" |2 Q* ^1 twas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-& `* r$ |2 @' c
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total5 g w( b# m6 u" z
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
% p* [2 ]' x6 m3 p3 M% Z# @and β-human chorionic gonadotropin was less than6 h6 a; i3 g. r% E4 W
5 mIU/mL (normal <5 mIU/mL). Serum follicular
" C% v& N" p6 K& q) mstimulating hormone and leuteinizing hormone
0 Y3 f0 J) E# l! Hconcentrations were less than 0.05 mIU/mL
3 ^2 ~% j% b* o5 y- j(prepubertal).
& Z p; m2 ], E8 G6 u3 }0 vThe parents were notified about the laboratory
- w; A- v X8 i! F, x% a: h \results and were informed that all of the tests were
9 R* w- L8 X" w7 ~normal except the testosterone level was high. The
* g t u% h9 e' B1 D4 ^5 v3 ?5 Dfollow-up visit was arranged within a few weeks to) d+ \/ I6 _& l0 Q* @; y6 r
obtain testicular and abdominal sonograms; how-
( O! W' D! s* F9 M/ m: }ever, the family did not return for 4 months.$ @2 \! _8 P, {# k
Physical examination at this time revealed that the% o T8 @* L4 m6 b9 t
child had grown 2.5 cm in 4 months and had gained
# Y# S+ u) O5 r3 R* _' U6 n2 kg of weight. Physical examination remained
" j* w8 |2 z, u0 X& ^! E* ^2 U& Runchanged. Surprisingly, the pubic hair almost com-
0 p! ?* S( i. p- p$ s4 i# q/ Bpletely disappeared except for a few vellous hairs at
f$ c( ~# k6 J1 J- hthe base of the phallus. Testicular volume was still 2
' E, j1 u5 r5 M2 o3 f; w' JmL, and the size of the penis remained unchanged.' B4 Q8 w" I ?1 W7 J
The mother also said that the boy was no longer hav-$ n$ _6 B3 i, r9 @
ing frequent erections.5 S: b6 k- s1 g# ~
Both parents were again questioned about use of; @3 P6 K: e) M _
any ointment/creams that they may have applied to
- |( b( e) c7 ?3 |5 ^% `the child’s skin. This time the father admitted the
% z' @- q$ N6 KTopical Testosterone Exposure / Bhowmick et al 541# ?( b0 n; k7 @. c1 S
use of testosterone gel twice daily that he was apply-! ]0 |, ~2 {0 B- _ {
ing over his own shoulders, chest, and back area for
j2 {- M0 I, t# Ta year. The father also revealed he was embarrassed
5 \/ e: T3 i% B. V0 l5 Cto disclose that he was using a testosterone gel pre-
6 @( w4 ~) d7 x3 h( qscribed by his family physician for decreased libido$ B" m1 ?2 k; Z. _; ^. v
secondary to depression.1 b8 s* U& @3 Q8 p$ b/ i1 V4 ?
The child slept in the same bed with parents.# X9 c# ^, Q& _ T: `3 \, X
The father would hug the baby and hold him on his
/ y. S$ D2 Z9 F* a. U, }chest for a considerable period of time, causing sig-
! _) t" S6 z. Jnificant bare skin contact between baby and father.
/ k& R1 L) |/ O6 g( K$ XThe father also admitted that after the phone call,0 m( I7 i! A& K+ {& a- |# k
when he learned the testosterone level in the baby! @+ E& x8 J w0 V% `
was high, he then read the product information
: e+ O) v, \6 h: f# e/ D% Q9 rpacket and concluded that it was most likely the rea-
) T7 z" Z) o9 j, _! S: Z0 Ason for the child’s virilization. At that time, they6 E) k+ g- z7 e" |1 W! o2 n4 b) B
decided to put the baby in a separate bed, and the4 O O+ [' Q' Q
father was not hugging him with bare skin and had: z' `& O8 ^8 C; i
been using protective clothing. A repeat testosterone- y# R3 f7 m b
test was ordered, but the family did not go to the/ H! [; e( F8 j# O
laboratory to obtain the test.5 g ]4 S1 E* h0 C& [% p( A K' U
Discussion9 z. H' ^6 j1 S8 q3 @. J
Precocious puberty in boys is defined as secondary" g2 `( E6 y' ~; R
sexual development before 9 years of age.1,4; U4 j9 `- y% l4 p8 F5 [ K/ W
Precocious puberty is termed as central (true) when
4 j4 g6 O2 [2 e) git is caused by the premature activation of hypo-
& u8 ~" r& Y/ T, Rthalamic pituitary gonadal axis. CPP is more com-
6 H, A. X! s4 |3 H! U7 Z5 gmon in girls than in boys.1,3 Most boys with CPP, V9 E0 Z: ^2 \! \/ `& D K7 M
may have a central nervous system lesion that is- t- P @* D* g" G- ]+ l, C% t* B
responsible for the early activation of the hypothal-) q- d B( Y) u) P2 d7 E9 ^& [
amic pituitary gonadal axis.1-3 Thus, greater empha-6 P% S7 g* L! i* g3 z {" z; h" Z
sis has been given to neuroradiologic imaging in3 Y$ a/ T" |$ Y8 n5 i1 G* N. u
boys with precocious puberty. In addition to viril-
; u& ~0 K9 t6 ^7 F2 u6 b1 d, |ization, the clinical hallmark of CPP is the symmet-9 v2 M8 i* _$ f [
rical testicular growth secondary to stimulation by8 ^5 ]; Q q1 _3 n$ [7 v
gonadotropins.1,3
+ ]3 U3 m2 z$ g, QGonadotropin-independent peripheral preco-
1 a: s' k* |3 F1 tcious puberty in boys also results from inappropriate
8 w$ [7 G1 @ } Xandrogenic stimulation from either endogenous or
; r' j0 _) V% Y9 r$ Yexogenous sources, nonpituitary gonadotropin stim-
, e) Z* I3 x3 y/ vulation, and rare activating mutations.3 Virilizing
. H5 r' V$ C& M$ t H% j8 tcongenital adrenal hyperplasia producing excessive
/ @/ |: O7 L, b+ u* d. c5 Madrenal androgens is a common cause of precocious
; D8 Z( J7 F1 ~: D* ]8 ?* y% |puberty in boys.3,4
+ u3 }) J; l/ TThe most common form of congenital adrenal
$ M/ M& `7 o$ n- S. f1 s0 Thyperplasia is the 21-hydroxylase enzyme deficiency.
5 L3 a8 m G! H+ w Z* f1 SThe 11-β hydroxylase deficiency may also result in" C- Y! v9 y& W# s/ ?! P) `9 v6 r
excessive adrenal androgen production, and rarely,# [/ N* V4 Y; ], g" n$ s( Z; E
an adrenal tumor may also cause adrenal androgen
# d) |5 z& R6 H' ^. T( ?' ~excess.1,36 O+ G, D6 _- h4 u0 }
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from" @4 h& o( u L/ d4 Q8 D% l W
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
9 m9 e/ S& s- x9 z) v: YA unique entity of male-limited gonadotropin-
% ]: n' l% {3 Z8 R' iindependent precocious puberty, which is also known
) W a; D3 t; i: l$ F4 s* t$ ~: Qas testotoxicosis, may cause precocious puberty at a
5 c9 t+ y9 K4 B" o) hvery young age. The physical findings in these boys
# a: e+ o* n5 W% C( H- v: Owith this disorder are full pubertal development,
; j& w/ Z5 E8 D9 X4 |3 Sincluding bilateral testicular growth, similar to boys
|. q* c' e5 P& l* _with CPP. The gonadotropin levels in this disorder, h: A2 D1 X6 x$ M8 d* x/ o; R
are suppressed to prepubertal levels and do not show
+ R* [3 J! h# Spubertal response of gonadotropin after gonadotropin-$ _2 p+ E4 S/ `
releasing hormone stimulation. This is a sex-linked' ^, {& q# {4 V/ v& ]/ _& T# r
autosomal dominant disorder that affects only) L* A. {1 s2 e/ d4 s7 e) i
males; therefore, other male members of the family) b" |- N: J1 h8 l4 }# P
may have similar precocious puberty.3
& n9 a/ H5 N" \6 x% bIn our patient, physical examination was incon-. {0 j& q& {; a$ w d K7 p5 E
sistent with true precocious puberty since his testi-
0 p6 s# B) N4 H: s; x* L. h5 }6 i5 Ncles were prepubertal in size. However, testotoxicosis5 x! I7 ^; o$ B/ J; t& F/ N
was in the differential diagnosis because his father7 U, S9 q: {9 l) d. M8 _
started puberty somewhat early, and occasionally,
- D% C p( N P0 b0 H! Rtesticular enlargement is not that evident in the# d" H; l& O; ]+ j8 o
beginning of this process.1 In the absence of a neg-/ E8 E$ l1 p8 r
ative initial history of androgen exposure, our7 ^/ Y& K( F j9 k$ @9 ]- ?8 G
biggest concern was virilizing adrenal hyperplasia,
5 a8 K- r8 ^- D" geither 21-hydroxylase deficiency or 11-β hydroxylase
! N, T6 U( m! a" k9 [8 ]& I7 Q9 bdeficiency. Those diagnoses were excluded by find-
' ^0 ~( A* l: K6 Eing the normal level of adrenal steroids.0 Z2 t; f7 Z! R0 k. ]
The diagnosis of exogenous androgens was strongly
B5 s! @1 n3 I0 S2 z: {suspected in a follow-up visit after 4 months because
" z$ W) k. A* O3 x3 o" Athe physical examination revealed the complete disap-
' h1 O" W2 t8 H3 @' N2 Vpearance of pubic hair, normal growth velocity, and
s4 S" q, Y; o! o' ^decreased erections. The father admitted using a testos-
& P5 ?* {+ ?; X; }terone gel, which he concealed at first visit. He was
. A0 H" H1 g! k- `1 Rusing it rather frequently, twice a day. The Physicians’0 k+ k% O: L4 o: J4 t
Desk Reference, or package insert of this product, gel or
z; g6 Y* K9 z3 [$ Acream, cautions about dermal testosterone transfer to
- E$ c$ l* D8 V; N; Punprotected females through direct skin exposure.0 N, `6 R3 [: e* {" _% I: C- ?9 x3 o
Serum testosterone level was found to be 2 times the
3 J( t6 ?4 C/ Y L+ ?* Rbaseline value in those females who were exposed to3 w) s$ q6 ]4 L3 W- c$ n% A- d7 m1 x
even 15 minutes of direct skin contact with their male" N: R6 a4 e1 p1 J2 I" G
partners.6 However, when a shirt covered the applica-9 o4 g1 j" y7 t
tion site, this testosterone transfer was prevented.+ Q) {+ y/ L( ?5 t! D5 u
Our patient’s testosterone level was 60 ng/mL,
4 N3 f" K1 G3 g! I0 z, Pwhich was clearly high. Some studies suggest that: X$ b$ L( C9 _ a; D) g, }6 J9 ?
dermal conversion of testosterone to dihydrotestos-+ D- q" }8 o5 p0 w5 B
terone, which is a more potent metabolite, is more- o/ F& u- k" N- R! j
active in young children exposed to testosterone
* M* Y) E7 C& L, Wexogenously7; however, we did not measure a dihy-
* z' p; Q \. Y2 |/ Idrotestosterone level in our patient. In addition to2 Z6 t3 Y+ [) p, R0 ~+ o# q
virilization, exposure to exogenous testosterone in
w# F& Y% \1 v# ]$ ]! Dchildren results in an increase in growth velocity and
' m$ r% y& O, F8 Aadvanced bone age, as seen in our patient.
. J/ d9 j3 B `7 sThe long-term effect of androgen exposure during
2 R+ j' T% {9 m6 W# y* ]0 W, kearly childhood on pubertal development and final- D# F! }, M% `. b& N3 C1 z
adult height are not fully known and always remain9 ?$ ^4 ?& M$ m5 D
a concern. Children treated with short-term testos-
- C w5 |4 r7 {, C3 Vterone injection or topical androgen may exhibit some) T$ F/ I8 K3 K2 l
acceleration of the skeletal maturation; however, after7 W |8 y2 o9 S. [' {1 u
cessation of treatment, the rate of bone maturation
1 m6 _( G5 X; ]decelerates and gradually returns to normal.8,9
: A" D6 l# B$ W. xThere are conflicting reports and controversy, z: r9 K0 t0 ]6 ^
over the effect of early androgen exposure on adult
D0 c% V$ q- Z4 Ppenile length.10,11 Some reports suggest subnormal, [, M Q# {7 a
adult penile length, apparently because of downreg-
: D6 ?& ~! `* ]+ H2 ^2 o% iulation of androgen receptor number.10,12 However,7 n! k# E: Z2 ^9 r- _
Sutherland et al13 did not find a correlation between
) z0 K' i9 B3 R& u/ B+ gchildhood testosterone exposure and reduced adult/ C2 d9 y9 b+ m$ Y, t: ^
penile length in clinical studies.4 q" _- x! G# K, v6 i+ ]
Nonetheless, we do not believe our patient is
( v7 [% j; o& D2 n% F0 j" l$ D: r( ngoing to experience any of the untoward effects from" s3 C& o) q) _. a' O, U9 _" _6 X
testosterone exposure as mentioned earlier because7 X3 x3 Z# q* X6 i
the exposure was not for a prolonged period of time.
) |0 _" T4 b, k- NAlthough the bone age was advanced at the time of2 T5 N% e0 L' Q* \/ q% R( ^5 l# X
diagnosis, the child had a normal growth velocity at, Q; e* M/ [& ^4 ]3 _! X
the follow-up visit. It is hoped that his final adult4 c. \1 x C' I, h: V6 I4 u5 ?: t
height will not be affected.
1 K$ P6 Y/ V6 f9 H9 dAlthough rarely reported, the widespread avail-
! \. W- b& t1 U- p+ J$ J1 _: Vability of androgen products in our society may
/ k- L, o5 _* @, d0 w' Dindeed cause more virilization in male or female
" X3 M( Y/ Z; I$ J7 _/ T9 q) ochildren than one would realize. Exposure to andro-
2 ~% J# F6 s2 ~; F0 n* a7 fgen products must be considered and specific ques-
5 V& a. V/ S5 @4 Ztioning about the use of a testosterone product or
$ C7 p! X6 i4 }% }- agel should be asked of the family members during# e( {/ @( x$ R+ c) y; l1 e. }/ I, z
the evaluation of any children who present with vir-
- [0 i$ X* j; K; X8 a& C9 e; hilization or peripheral precocious puberty. The diag-
. A+ x* [; H2 \" x; X( Jnosis can be established by just a few tests and by
1 C/ H6 T2 G7 o% |+ ~appropriate history. The inability to obtain such a
. f0 f0 Y6 i" I# H. h0 _. ~& L9 Hhistory, or failure to ask the specific questions, may
+ C v. F5 g' j: T8 H2 M0 D- ~result in extensive, unnecessary, and expensive I7 Y/ M# |4 b# z% H
investigation. The primary care physician should be! ] p+ A& M3 C$ b
aware of this fact, because most of these children' I/ ~4 z" \, g. b" @) V- E/ Z
may initially present in their practice. The Physicians’" m6 G; Z" s9 ^' I1 [( J3 T( n
Desk Reference and package insert should also put a3 f. M0 U2 ]/ z) [
warning about the virilizing effect on a male or
W) m7 q/ i& Y* s* Ofemale child who might come in contact with some-
! E$ g# l+ K j z/ oone using any of these products.
" \: R+ R+ v. s8 r- |: @1 KReferences0 V; r, O$ x% E
1. Styne DM. The testes: disorder of sexual differentiation
( V9 K" Q( J1 t% i1 Aand puberty in the male. In: Sperling MA, ed. Pediatric: N7 g0 I% g! k* z4 w' x2 \9 J
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
, p" Q6 f! Z0 b! r8 P2002: 565-628.
/ C; A) A& t# N9 s0 i4 _2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious2 O1 o1 B6 K, {! T6 U" b! J
puberty in children with tumours of the suprasellar pineal
$ |0 T" }% E# ]- `1 p- aat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
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areas: organic central precocious puberty. Acta Paediatr.# B0 b: l! K2 D
2001;90:751-756.+ |: j: |4 [ |5 r, U( x
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
% m1 A* s# T7 v8 MPediatric Endocrinology. 4th ed. New York, NY: Marcel
: w. h% q" m2 r) v' L, M8 UDekker Inc; 2003:211-238.: O; `7 i O2 p6 V" @
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual% o* h2 c$ I( ]5 d. U
development in a two-year-old boy induced by topical; A3 f3 I/ [; Q* S+ E
exposure to testosterone. Pediatrics. 1999;104:e23. q% k+ R( O0 e: U- U) R4 u: `
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
+ M; N; D, m+ }9 B$ qSkeletal Development of the Hand and Wrist. 2nd ed.
* \5 @( u. {6 V4 T6 _Stanford, CA: Stanford University Press; 1959.+ x, V3 V' M" W8 z
6. Physicians’ Desk Reference. Androgel 1% testosterone,' o+ U$ J0 F( B' c
Unimed Pharmaceutical Inc. Montvale, NJ: Medical' G. l- t9 } b) S. w, d$ G" p( L
Economics Company, Inc; 2004:3239-3241.2 [1 r$ l# X" s3 S9 [5 f- c+ @8 Z
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