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is a significant concern for physicians. Central
" i/ Q1 s8 K, mprecocious puberty (CPP), which is mediated
R4 Q/ \; F5 i" [, Q( \9 F/ [7 Ithrough the hypothalamic pituitary gonadal axis, has
: U5 r9 I1 q0 \a higher incidence of organic central nervous system
+ [9 m' [- `, F1 c, `lesions in boys.1,2 Virilization in boys, as manifested
( p" c) T8 U" @3 z3 a7 \7 O, g; z/ uby enlargement of the penis, development of pubic8 R" F% d& \& O3 m- q2 J: f4 k8 D
hair, and facial acne without enlargement of testi-
" Q- l: I; U# g8 Qcles, suggests peripheral or pseudopuberty.1-3 We
_/ E7 y# A; r W2 U preport a 16-month-old boy who presented with the2 v4 Z- q' {/ s: m5 j* Y, _, c; ~
enlargement of the phallus and pubic hair develop-
3 s3 e3 \' o8 ]( y' u# ~ment without testicular enlargement, which was due
& _/ e, p/ W# M& o' cto the unintentional exposure to androgen gel used by
0 ?1 z' L J) J( a2 D& M6 Xthe father. The family initially concealed this infor-9 \: P3 l6 T5 ~
mation, resulting in an extensive work-up for this
# w$ o+ i+ D& e4 Zchild. Given the widespread and easy availability of
, t9 K' o$ D8 v4 d( Ntestosterone gel and cream, we believe this is proba-
1 b: f1 a- q5 A8 {6 j. I+ z9 pbly more common than the rare case report in the
4 N3 Z/ F, i1 K* p: ?% y. [# k* ?+ P/ gliterature.4
, q6 ^3 u9 U, F2 n/ h+ c2 mPatient Report
7 [9 t1 s7 c, |: }' b" }/ b: ]A 16-month-old white child was referred to the
8 g' d, L2 e" @ _" L# Xendocrine clinic by his pediatrician with the concern( \, g- e. Z) ]
of early sexual development. His mother noticed
/ a& o+ h7 [' H/ S1 Ilight colored pubic hair development when he was, @; n3 T' f0 F1 Z( V
From the 1Division of Pediatric Endocrinology, 2University of1 v2 ]( ]+ E6 k) b2 W' [* d5 T
South Alabama Medical Center, Mobile, Alabama.) T0 q6 M7 M/ {+ A7 I
Address correspondence to: Samar K. Bhowmick, MD, FACE,& w% m( @4 Y7 H$ n C! H
Professor of Pediatrics, University of South Alabama, College of1 v5 O/ }" k0 n$ m: t, \
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
( u1 @) f1 `5 r4 H2 re-mail: [email protected].
. o) z7 Q& w$ M$ Y8 D' |. habout 6 to 7 months old, which progressively became
5 ~! H" b4 C( B4 N9 |8 ~darker. She was also concerned about the enlarge-5 y0 `# o0 y( W
ment of his penis and frequent erections. The child
J& z% k8 w F$ ~; G% |0 uwas the product of a full-term normal delivery, with
5 F# N$ O* a0 D. q& Ka birth weight of 7 lb 14 oz, and birth length of0 P5 c! g1 o+ I* O
20 inches. He was breast-fed throughout the first year
5 u! E7 z& f/ S. R9 W; U5 ]* Tof life and was still receiving breast milk along with- y B+ j1 s4 u, O r# A
solid food. He had no hospitalizations or surgery,
: {3 H3 u7 a( n" v$ d1 @7 Q! aand his psychosocial and psychomotor development
4 S) [4 b( F4 w2 \# ?* O' m3 Uwas age appropriate.3 N- G: l7 A. k. `* ]4 |+ [: e
The family history was remarkable for the father,4 y. H: q0 J- l
who was diagnosed with hypothyroidism at age 16, X" `( @" F/ @1 j2 E
which was treated with thyroxine. The father’s
- x" v l9 N* j; Xheight was 6 feet, and he went through a somewhat) G: m$ E$ n% u8 b% G3 s
early puberty and had stopped growing by age 14.$ O- g7 T5 l: T$ ~- v2 S$ l8 W3 b
The father denied taking any other medication. The
( _) H+ D' |1 j1 Nchild’s mother was in good health. Her menarche1 w4 a& ]3 a0 `0 B7 I& ^: h6 t
was at 11 years of age, and her height was at 5 feet: B& o5 S* c& t) {5 k7 Q$ A# b# P
5 inches. There was no other family history of pre-0 B$ Y2 U: E# @1 L4 T4 h/ x
cocious sexual development in the first-degree rela-3 X1 h4 j( s0 t/ ^
tives. There were no siblings.
5 }$ i+ ], |7 Z8 i' o* i0 f7 S. C/ Q. MPhysical Examination
/ W9 s: `: M2 _/ uThe physical examination revealed a very active,- q( C! K# y8 h' f! e
playful, and healthy boy. The vital signs documented/ `$ k% ]2 A2 }( S, H: g
a blood pressure of 85/50 mm Hg, his length was
8 o. d5 y' m; m! a5 r9 ]90 cm (>97th percentile), and his weight was 14.4 kg
. K2 x8 ]5 l/ @ V5 B: F% p(also >97th percentile). The observed yearly growth' a1 B2 }( [. m4 E; T
velocity was 30 cm (12 inches). The examination of( O- N7 U7 B( j. L
the neck revealed no thyroid enlargement.
$ P3 {) A/ Q$ l7 w% HThe genitourinary examination was remarkable for6 D; W/ `3 V, k6 l+ y4 B M9 h9 P
enlargement of the penis, with a stretched length of! C$ v& u7 @! K2 O
8 cm and a width of 2 cm. The glans penis was very well
. x/ L8 m7 H& [/ w; A! \2 t9 ~developed. The pubic hair was Tanner II, mostly around1 O2 n A8 j. |
540
4 Q% x1 b8 V, t! [) zat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
# J* u4 C$ Z& w: {9 hthe base of the phallus and was dark and curled. The
. c# R, U# @, C& i6 otesticular volume was prepubertal at 2 mL each.1 e8 g, X, w7 h0 V( z) A8 X: O6 d
The skin was moist and smooth and somewhat
$ W( R$ a# q! C9 @: p1 Noily. No axillary hair was noted. There were no2 @7 l) D4 }/ L; U4 |9 R
abnormal skin pigmentations or café-au-lait spots.
( \, p. X; B4 }' bNeurologic evaluation showed deep tendon reflex 2+. {( [6 K9 B, _* D1 |( ~( d
bilateral and symmetrical. There was no suggestion
# r9 \- a L2 {* ?4 c( Hof papilledema.4 } a3 n+ y2 L' k' K8 |
Laboratory Evaluation
) W* ^" B3 i' g( Z2 RThe bone age was consistent with 28 months by
' Z/ Y }. L# Z9 r) Z8 ]using the standard of Greulich and Pyle at a chrono-- F7 R7 [2 z& P. Q$ \
logic age of 16 months (advanced).5 Chromosomal* I, j* C z$ i4 `: W
karyotype was 46XY. The thyroid function test
# c! ~; ?+ C' B) |showed a free T4 of 1.69 ng/dL, and thyroid stimu-# x8 ^5 X( \' Z+ N3 p/ V: W' C
lating hormone level was 1.3 µIU/mL (both normal).
9 \1 E7 Y5 ^3 P3 L- qThe concentrations of serum electrolytes, blood- `. k; q5 E. V
urea nitrogen, creatinine, and calcium all were
) m, O, _- ~8 H0 U0 Z, Wwithin normal range for his age. The concentration
2 ^- c* n' s; R yof serum 17-hydroxyprogesterone was 16 ng/dL
) u) Y' S$ P0 b- h% k8 G0 e(normal, 3 to 90 ng/dL), androstenedione was 20
% S) Y1 H& q4 rng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
2 y. T+ {& C- t/ W* M2 B+ n5 ~" eterone was 38 ng/dL (normal, 50 to 760 ng/dL), D# b, J, e4 o
desoxycorticosterone was 4.3 ng/dL (normal, 7 to7 m6 s' W, I! n
49ng/dL), 11-desoxycortisol (specific compound S)" U( S6 a0 {: w6 r$ n
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 j2 w( o+ x8 m: I2 Ntisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total2 f/ |2 W3 L+ c! q
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),' }, x+ S0 U/ l: j' p4 q$ f
and β-human chorionic gonadotropin was less than# q$ G( C4 d& Z3 M l8 S5 `
5 mIU/mL (normal <5 mIU/mL). Serum follicular% X2 b1 `8 z& z" |+ y2 p
stimulating hormone and leuteinizing hormone
! o! v# P9 @! C4 h; pconcentrations were less than 0.05 mIU/mL
) ~' H; H* o# x/ \) Q8 b(prepubertal).
( I1 T5 }+ X. j4 ?6 R. b# NThe parents were notified about the laboratory
0 c" e' |" g/ L0 e% y1 c! Q; }% j% Q& gresults and were informed that all of the tests were- `7 n% k7 m% }7 V+ L3 g
normal except the testosterone level was high. The
- e M* t6 m9 E: P# B4 M: Y+ Nfollow-up visit was arranged within a few weeks to
7 \! |9 `9 \9 |- B$ k3 ~ a2 X# lobtain testicular and abdominal sonograms; how-' T" c5 @# p+ {$ F; b* B0 r
ever, the family did not return for 4 months.( @6 v% T" o) k- w3 S3 W$ x
Physical examination at this time revealed that the
4 ~$ q# v. s) t% [child had grown 2.5 cm in 4 months and had gained
( |: L6 T6 t' U- {5 `- M1 K2 kg of weight. Physical examination remained
8 A5 K) a( G* w# lunchanged. Surprisingly, the pubic hair almost com-
# E' Q& e( m" y! v( R' @& N. Upletely disappeared except for a few vellous hairs at
. y E( Q) f, nthe base of the phallus. Testicular volume was still 2
1 T. A' U2 r7 t2 _mL, and the size of the penis remained unchanged.. a. l; w; ]9 {8 z5 B. K
The mother also said that the boy was no longer hav-
9 k3 Q* O' h* y$ W- z: b7 ring frequent erections.8 C2 |" q* B4 W1 A
Both parents were again questioned about use of5 Q$ x- h% I1 T* ^2 m% w, b
any ointment/creams that they may have applied to# B( S9 [* a, b+ K
the child’s skin. This time the father admitted the
" s2 g5 |1 P) E- |0 ]* K5 N9 F4 ZTopical Testosterone Exposure / Bhowmick et al 541: {+ U; l( |, s
use of testosterone gel twice daily that he was apply-
4 U* |4 r# q# K2 v6 n- V- t' ying over his own shoulders, chest, and back area for* X7 ]6 G% j2 a1 s0 s: T! e2 y
a year. The father also revealed he was embarrassed
3 z6 l! {- _- |9 d6 \& j |0 bto disclose that he was using a testosterone gel pre-
5 ]: @, K- s( x4 E& D2 @scribed by his family physician for decreased libido' V( o# a8 ~+ B
secondary to depression.
" r0 d3 ~' m0 GThe child slept in the same bed with parents.
. ?. |3 _( A! Q% o" RThe father would hug the baby and hold him on his5 R* G. b# c' Z2 z
chest for a considerable period of time, causing sig-
B, {# H3 i, o7 ` {" y! Dnificant bare skin contact between baby and father.
: I6 D7 u' R6 ~The father also admitted that after the phone call,8 M. V6 i* i0 j% i
when he learned the testosterone level in the baby4 a4 b, ?- v0 l/ }) Y" u; b( g
was high, he then read the product information
) x+ M4 s6 p5 f. {1 D( rpacket and concluded that it was most likely the rea-
( v) C/ e" l/ Q% ?/ |1 Bson for the child’s virilization. At that time, they
9 ^. [/ R; Z( c5 ydecided to put the baby in a separate bed, and the; l# B1 J: T# @
father was not hugging him with bare skin and had
0 U7 ?4 I# s- o4 K' Kbeen using protective clothing. A repeat testosterone7 K" k" ?" M& c1 ~- P- ?2 t4 ^! f
test was ordered, but the family did not go to the# ?) Z, d7 \5 D. k2 j) d$ \
laboratory to obtain the test.
5 {! ~& g. B5 H# q# h1 T! @Discussion" e# C" _& i! }5 h
Precocious puberty in boys is defined as secondary6 k% ]1 l4 v# @+ B
sexual development before 9 years of age.1,41 V" q8 Z. _6 g. h' r! X
Precocious puberty is termed as central (true) when
* P; h `3 x, o9 Y* iit is caused by the premature activation of hypo-
( I; }8 k, S& U7 J }/ x; f+ r! h5 {9 \thalamic pituitary gonadal axis. CPP is more com-
3 E$ a: p% j) E7 q& q {mon in girls than in boys.1,3 Most boys with CPP
) _" b, L* n$ omay have a central nervous system lesion that is$ H6 J/ b+ N# \2 F0 H) }
responsible for the early activation of the hypothal-) [1 v/ e) g, O4 d2 k/ q9 c
amic pituitary gonadal axis.1-3 Thus, greater empha-4 X+ h0 ?' }1 B
sis has been given to neuroradiologic imaging in
|- _# R% k0 | ]; ^! N' mboys with precocious puberty. In addition to viril-
2 I r" c$ l' C8 P& {. iization, the clinical hallmark of CPP is the symmet-
. R& @: x# J3 B) ~rical testicular growth secondary to stimulation by2 R* o$ W; x% E4 K
gonadotropins.1,3
1 |# l* f% Z* IGonadotropin-independent peripheral preco-
5 n$ k+ X5 _. c' t3 J( Ccious puberty in boys also results from inappropriate
& s0 |* z1 j( wandrogenic stimulation from either endogenous or
- B7 u' c M' n+ f2 ]. Vexogenous sources, nonpituitary gonadotropin stim-5 e. F% [- C: z! K( J
ulation, and rare activating mutations.3 Virilizing* Q2 L6 E5 j/ n* A$ G* l
congenital adrenal hyperplasia producing excessive/ U% G, W( `! s" B/ ^! S, ~0 m$ [; g- Y
adrenal androgens is a common cause of precocious
2 I2 Z- ^$ y' Y3 p3 M( t A8 m$ f4 tpuberty in boys.3,4$ H& m8 u% n: K. w% i
The most common form of congenital adrenal
* }0 W' X: p' l) S7 fhyperplasia is the 21-hydroxylase enzyme deficiency.' j! W! M2 L% O4 {
The 11-β hydroxylase deficiency may also result in; U, f9 K* k! s5 a# w( X
excessive adrenal androgen production, and rarely,
4 a: }9 ~- _# z2 D3 p) W' U: Uan adrenal tumor may also cause adrenal androgen& G2 }! }2 H/ S: R. |+ D
excess.1,3
; t! x% W8 l; N% W7 {at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ N5 |% |: K; t, [
542 Clinical Pediatrics / Vol. 46, No. 6, July 20075 q; A$ l; z$ ~1 K+ s# H/ {
A unique entity of male-limited gonadotropin-- S' T. I5 j6 x( S; Z( c4 {' s
independent precocious puberty, which is also known! e' s* P9 H$ B7 X( x* }% E
as testotoxicosis, may cause precocious puberty at a' C4 R8 G0 @/ w: [5 J7 P
very young age. The physical findings in these boys
- ~9 ] q" m) p) A' u0 ]7 L' L7 |with this disorder are full pubertal development,3 a& Q* Y" z0 [$ x6 \
including bilateral testicular growth, similar to boys8 X1 f& ?7 b' k5 Q& s; I9 I, {9 T
with CPP. The gonadotropin levels in this disorder
4 F& Z5 C) k1 I8 m% ?7 yare suppressed to prepubertal levels and do not show2 Z7 c, v) j# k$ z; y6 ~
pubertal response of gonadotropin after gonadotropin-
* T M. k: F4 J I, ^6 W1 mreleasing hormone stimulation. This is a sex-linked
+ p/ i0 B% y8 j( z' mautosomal dominant disorder that affects only, M1 d0 ]: o% F, C6 s. Z7 z
males; therefore, other male members of the family
" w0 A5 _) _, u" k7 q; hmay have similar precocious puberty.35 X4 p7 I3 I- k
In our patient, physical examination was incon-( K: A v/ u: P1 d8 A8 k1 j3 N: M* Z
sistent with true precocious puberty since his testi-
8 g1 K; O4 P; @& W4 x3 J) N) j$ Scles were prepubertal in size. However, testotoxicosis
+ V! D$ K3 g* G5 kwas in the differential diagnosis because his father g/ D; q; A2 L& d6 D! x/ [: ^
started puberty somewhat early, and occasionally,
! E7 V6 p9 C) I" C) E) k- ktesticular enlargement is not that evident in the
2 I# t0 n5 t9 Y- ibeginning of this process.1 In the absence of a neg-
, \4 Q! x0 ?0 x2 pative initial history of androgen exposure, our
) }1 X E. J3 E! x2 u- C- fbiggest concern was virilizing adrenal hyperplasia,- M1 w4 p# ]. Q0 G
either 21-hydroxylase deficiency or 11-β hydroxylase
: ?% P3 j. `' sdeficiency. Those diagnoses were excluded by find-
; `1 e' Y! \4 w( Bing the normal level of adrenal steroids.
" e! n) ]) z# V) L$ OThe diagnosis of exogenous androgens was strongly
( {4 l5 T' `/ m8 K3 ssuspected in a follow-up visit after 4 months because
9 L, ~" v: ?' e/ [the physical examination revealed the complete disap-9 p7 L9 w: g% J1 H; ]1 n
pearance of pubic hair, normal growth velocity, and
: x G) j; I& ]) {2 h4 U5 K; Hdecreased erections. The father admitted using a testos-8 f# F h) V& b4 R/ Q9 `9 }2 K5 }* _% E
terone gel, which he concealed at first visit. He was
+ f1 Z/ X2 ^; g. f6 Lusing it rather frequently, twice a day. The Physicians’
+ P+ G% C6 v% \* S* ?% R; x! oDesk Reference, or package insert of this product, gel or
" p7 h3 s+ z; D, M0 t5 U. ^cream, cautions about dermal testosterone transfer to
* [. q- ^0 @7 zunprotected females through direct skin exposure.
) w/ K( O* b Z- B0 uSerum testosterone level was found to be 2 times the
; x2 h! U1 M6 U& _ B' P4 e' Cbaseline value in those females who were exposed to
8 g: m, [. f/ o# d1 y. }) Keven 15 minutes of direct skin contact with their male+ S* h1 }* V% @' N6 `0 r
partners.6 However, when a shirt covered the applica-
! S- l* g. n+ l3 Y7 p; Ution site, this testosterone transfer was prevented.
" y: K; U j6 cOur patient’s testosterone level was 60 ng/mL,
9 `. s# F5 k8 [7 R6 v pwhich was clearly high. Some studies suggest that
; s r; R3 @, L3 x8 Xdermal conversion of testosterone to dihydrotestos-
# W; O5 X3 u5 R4 cterone, which is a more potent metabolite, is more4 G0 T. C" _/ K! d/ p+ U% S
active in young children exposed to testosterone
( g I2 M" ~6 B8 ]5 a( j4 X3 v# Sexogenously7; however, we did not measure a dihy-) T3 q" f5 J; l: m3 @7 F! o
drotestosterone level in our patient. In addition to) h% e' l1 V) e! n
virilization, exposure to exogenous testosterone in
+ S$ w: X* Z& nchildren results in an increase in growth velocity and) E/ s/ } h1 s7 X7 }; y7 k
advanced bone age, as seen in our patient.& v& z$ k( @- i
The long-term effect of androgen exposure during8 L: x6 t6 ~) g0 s- p0 s' O# d
early childhood on pubertal development and final
0 Z) ]+ a% f' ?/ a: \8 {1 Uadult height are not fully known and always remain$ @7 w1 P, I1 X
a concern. Children treated with short-term testos-
4 y+ F, l) v5 n8 q! X. fterone injection or topical androgen may exhibit some x9 n8 P' J$ e5 x# `
acceleration of the skeletal maturation; however, after
1 V& V2 L" C- s& u0 \3 j1 @! N# mcessation of treatment, the rate of bone maturation
) l7 h: s4 _3 O( x" Udecelerates and gradually returns to normal.8,9
( ~/ _& e# a& kThere are conflicting reports and controversy; W9 ]3 a1 @. s
over the effect of early androgen exposure on adult
1 n' e3 u$ Z, C3 ~penile length.10,11 Some reports suggest subnormal+ _) m$ F, G0 S+ t1 H
adult penile length, apparently because of downreg-
3 I4 J- Q7 h v4 l, zulation of androgen receptor number.10,12 However,
; w+ P: _ f$ KSutherland et al13 did not find a correlation between
- Q0 W( P7 t* f4 l' \" Cchildhood testosterone exposure and reduced adult% C o3 {, q7 @# p: {
penile length in clinical studies.
) A- k9 \. T2 e- R) F mNonetheless, we do not believe our patient is
9 X9 s; y- o+ v9 k/ `4 Z/ xgoing to experience any of the untoward effects from5 K0 p" _3 Z2 q/ j8 r; t
testosterone exposure as mentioned earlier because
6 X& |8 A2 D3 j9 s* R, Gthe exposure was not for a prolonged period of time.& w. Z+ N5 x7 @: \
Although the bone age was advanced at the time of
7 \" `9 d' j7 v4 Adiagnosis, the child had a normal growth velocity at3 R6 U8 T! `6 G8 @4 v
the follow-up visit. It is hoped that his final adult
6 k7 B- V, @4 x2 |2 a' ^height will not be affected.
3 u3 B. @$ G3 \8 }6 Z) a! _Although rarely reported, the widespread avail-
$ g/ ]( x, O O/ @% pability of androgen products in our society may5 m; D) o, }* |# ]/ j0 w' w
indeed cause more virilization in male or female6 B4 M* J* o& F
children than one would realize. Exposure to andro-
% @7 N. f2 q* h9 n% p+ Cgen products must be considered and specific ques-/ E9 C9 q+ @! O! j( z) i* B t! k
tioning about the use of a testosterone product or6 [$ S# t8 y/ Q
gel should be asked of the family members during
, ?6 V+ q/ X& x4 e p0 ^the evaluation of any children who present with vir-
! h5 `3 O4 c8 i! Z9 T0 o' g4 Silization or peripheral precocious puberty. The diag-- c' }2 }, W X
nosis can be established by just a few tests and by
+ W! g$ i e% } `1 C4 O/ u. wappropriate history. The inability to obtain such a7 Q" J& b8 L! D8 Q+ t: @3 [
history, or failure to ask the specific questions, may
- T) I+ [1 _0 S3 Q w6 }! k: vresult in extensive, unnecessary, and expensive
; ]9 ?$ S3 G; o+ C+ ^investigation. The primary care physician should be; O7 Z4 m( @1 N2 q) K" C) G
aware of this fact, because most of these children- m [* y# U4 E
may initially present in their practice. The Physicians’, T0 {. T4 d; f( O1 p8 K
Desk Reference and package insert should also put a
* b0 T% l$ ]2 C: [) L! G; l& Nwarning about the virilizing effect on a male or0 J5 |9 D2 c* d
female child who might come in contact with some-/ B; Z% S; h" G1 n; x/ a
one using any of these products." X: u5 g, l+ {) M3 B" v6 H3 w
References% j m5 A# |9 T7 h
1. Styne DM. The testes: disorder of sexual differentiation
- w/ |( }0 O! eand puberty in the male. In: Sperling MA, ed. Pediatric! w% \( |6 [: G) p& A; \
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
6 l. f. E1 b* ^" D0 ~2002: 565-628.2 K3 h( A, p0 S6 }) L" C
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
' [; B1 v9 l7 ^3 z2 Bpuberty in children with tumours of the suprasellar pineal8 S6 x- a; @+ R" R4 }" F
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
& t3 o! c+ k- F5 P7 i4 C* f" bTopical Testosterone Exposure / Bhowmick et al 543
' h6 H5 e* _# t! h& Vareas: organic central precocious puberty. Acta Paediatr.
- |; M, j' n4 W2 x/ T' I2001;90:751-756.
5 s$ M2 B% G4 n! Q3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
$ H* w2 u: D$ s, n" F% TPediatric Endocrinology. 4th ed. New York, NY: Marcel9 e0 j9 Z4 Q9 d& F; `. Y
Dekker Inc; 2003:211-238.& ]* c# s5 J! g) O- b' F N
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
) E: r7 P0 |. odevelopment in a two-year-old boy induced by topical
2 p) b+ u; ?! b9 @exposure to testosterone. Pediatrics. 1999;104:e23.
- g7 l5 b0 x3 v2 L0 [5 r6 [5. Greulich WW, Pyle SI, eds. Radiographic Atlas of2 }& x( I5 \1 q8 W
Skeletal Development of the Hand and Wrist. 2nd ed.5 c3 I4 b: x+ z) h8 J# X0 X
Stanford, CA: Stanford University Press; 1959.- `! |- M/ w$ b3 G6 Z' d
6. Physicians’ Desk Reference. Androgel 1% testosterone,
' ~3 l' E u# q4 _+ H! yUnimed Pharmaceutical Inc. Montvale, NJ: Medical
! y/ `& U: k; w# T& `Economics Company, Inc; 2004:3239-3241." ^8 B( | |$ y* c
7. Klugo RC, Cerny JC. Response of micropenis to topical
& m" p- v2 m' @0 P1 w7 Y; ntestosterone and gonadotropin. J Urol. 1978;119:7 U( a5 y2 L4 j; Z, L3 S( J$ n
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