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is a significant concern for physicians. Central" D$ x5 D5 L2 Q5 `' j( N
precocious puberty (CPP), which is mediated: T7 G9 t$ k8 g0 X
through the hypothalamic pituitary gonadal axis, has
; k8 Q. a( c0 G! X2 Wa higher incidence of organic central nervous system
9 w) {$ h* J9 |: w, K' `; K0 Elesions in boys.1,2 Virilization in boys, as manifested
. Z) h9 u% i" g5 X$ w8 p, {by enlargement of the penis, development of pubic
. c+ d6 F1 o0 m( shair, and facial acne without enlargement of testi-6 V* M! ]9 B; n. ]3 Q; y O5 n9 q
cles, suggests peripheral or pseudopuberty.1-3 We
! G- |7 }6 ]1 Zreport a 16-month-old boy who presented with the% d$ _* S. `1 n, i4 |+ C1 t: U
enlargement of the phallus and pubic hair develop-0 |1 ~% n J3 E2 T( B
ment without testicular enlargement, which was due
8 `& t8 O& Y' Nto the unintentional exposure to androgen gel used by4 I6 M$ f: k6 F
the father. The family initially concealed this infor-
% s: s/ o& \1 e% _3 _. Wmation, resulting in an extensive work-up for this
* ?2 q4 t- ~- B5 |! l1 Q5 X9 V) h; Vchild. Given the widespread and easy availability of
3 ~0 q: D' d$ z% htestosterone gel and cream, we believe this is proba-, z1 p3 \! W1 A- F
bly more common than the rare case report in the) N$ ~' X3 R& g3 ]) ?& a* {
literature.4
. ?9 c/ J2 W$ }3 ]+ BPatient Report6 F" M; j' V0 v# I" n* s
A 16-month-old white child was referred to the
/ w, @$ @6 \; ] ?endocrine clinic by his pediatrician with the concern2 F M# r# G" `# U- Q. q3 L; y
of early sexual development. His mother noticed
8 ~& u" W ?2 p Xlight colored pubic hair development when he was A2 \, r: b; H+ t3 F! K. g3 E) Q
From the 1Division of Pediatric Endocrinology, 2University of
) P/ {% r5 l. k# T4 [South Alabama Medical Center, Mobile, Alabama.1 _8 W/ N6 |4 Z g9 X4 I
Address correspondence to: Samar K. Bhowmick, MD, FACE,- e! H5 y0 a. e* G0 e+ I+ n
Professor of Pediatrics, University of South Alabama, College of
" O. k% n; t5 T- K( KMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;" N3 O9 m( I1 h' G5 [) P' H! M, u
e-mail: [email protected].
! i% s3 H+ c# {' c) `about 6 to 7 months old, which progressively became0 d) K- i6 N" K' K1 g
darker. She was also concerned about the enlarge-
$ z M9 h$ R3 M- n9 Bment of his penis and frequent erections. The child2 C `: K4 q, S( n9 V2 R' W
was the product of a full-term normal delivery, with
" n6 I+ e+ h+ B6 ]3 _9 Pa birth weight of 7 lb 14 oz, and birth length of4 h- _; a$ ~+ ]! ?
20 inches. He was breast-fed throughout the first year
/ s4 [8 g) Z! `3 a: v0 \3 }# Z4 u tof life and was still receiving breast milk along with
0 s7 R' ?% X0 z/ u7 ~solid food. He had no hospitalizations or surgery,( s- M: Y t- p5 m- ?/ {& m
and his psychosocial and psychomotor development) _& u4 o S1 w9 s! P0 i
was age appropriate.
9 f0 b2 P& h& [! c( g0 D2 rThe family history was remarkable for the father,' I+ b4 I' c2 g* r: j( T
who was diagnosed with hypothyroidism at age 16,
% `: R& z5 `+ e1 @( |- rwhich was treated with thyroxine. The father’s
' v$ \ ^8 \; N: \height was 6 feet, and he went through a somewhat7 R& t" `0 c2 T4 q) I% g4 r& H
early puberty and had stopped growing by age 14.+ G7 y* q9 }4 Z7 P) y( q
The father denied taking any other medication. The6 a% E6 O2 J/ g5 f9 m
child’s mother was in good health. Her menarche" E' ^8 I4 u5 M. T1 n3 ~) Q0 o+ @
was at 11 years of age, and her height was at 5 feet
/ g5 u( ?5 L- ~; v5 inches. There was no other family history of pre-
8 q) V4 r# G: w \1 acocious sexual development in the first-degree rela-* O$ V! h! J: Q4 \. j' k
tives. There were no siblings.! [7 `2 d% @4 w2 d
Physical Examination
; ]" Y# s {& tThe physical examination revealed a very active,9 T/ y! O; E: r7 i1 ~
playful, and healthy boy. The vital signs documented8 p' v9 G9 X) b3 d
a blood pressure of 85/50 mm Hg, his length was/ }% B0 o) T$ Q# ^
90 cm (>97th percentile), and his weight was 14.4 kg
' s7 |- W# p+ y) M* E. Y' \, R(also >97th percentile). The observed yearly growth$ S$ D. k7 H/ I7 K) [
velocity was 30 cm (12 inches). The examination of2 A' Q" F3 Y8 h9 ?( ?
the neck revealed no thyroid enlargement./ p9 R. V2 p8 z3 l4 j9 \6 Y
The genitourinary examination was remarkable for
) ?% ?6 n* O& ?2 y8 q. {enlargement of the penis, with a stretched length of
; F$ p' P) p3 `% R- N8 cm and a width of 2 cm. The glans penis was very well0 {* G. u8 t/ P. t' A q
developed. The pubic hair was Tanner II, mostly around. x; J9 R; \8 U
540
! N9 {3 \6 F1 |- Y/ \at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from4 }1 b$ e3 Q5 N* p1 @
the base of the phallus and was dark and curled. The
. e2 p9 G$ V7 E1 T3 D0 ^testicular volume was prepubertal at 2 mL each.5 v' M9 G: Q; q, E+ v" S4 R' l
The skin was moist and smooth and somewhat3 x5 C% O) e3 z) }8 E( {
oily. No axillary hair was noted. There were no
1 @5 ?* ?/ H2 ]- k5 x. J% ]$ oabnormal skin pigmentations or café-au-lait spots.% \# }; p9 W& p/ G
Neurologic evaluation showed deep tendon reflex 2+
% w9 b- K T9 v" R) u V" I: kbilateral and symmetrical. There was no suggestion& c# d( h# `9 n/ A( }
of papilledema.* X6 k- ?# z- ?, v* y4 }! o
Laboratory Evaluation$ g8 L+ c+ \4 x
The bone age was consistent with 28 months by0 |5 b; ~( c+ X+ j9 e" j
using the standard of Greulich and Pyle at a chrono-
4 Z& J5 D7 h, s' l7 Rlogic age of 16 months (advanced).5 Chromosomal
- Z; [& e: _' d4 ekaryotype was 46XY. The thyroid function test
" R8 m7 I" M8 pshowed a free T4 of 1.69 ng/dL, and thyroid stimu-( s9 c. K/ o# h0 \# X
lating hormone level was 1.3 µIU/mL (both normal).
; O( k! K6 ^# K! V3 @3 xThe concentrations of serum electrolytes, blood
$ Y! [/ x2 f' l) [0 rurea nitrogen, creatinine, and calcium all were% |: V4 i- O9 g: r
within normal range for his age. The concentration3 q* {+ Y8 \! m/ ?& x9 C4 f- o
of serum 17-hydroxyprogesterone was 16 ng/dL# W* \4 p6 D$ G
(normal, 3 to 90 ng/dL), androstenedione was 20
( e T$ A' ?7 B% i m$ G, O; u& Png/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
, p0 o. r+ e2 {" O; }terone was 38 ng/dL (normal, 50 to 760 ng/dL),
! p; P* V# u+ J! W! Ddesoxycorticosterone was 4.3 ng/dL (normal, 7 to
$ ~6 h |$ D# n u5 g" Q49ng/dL), 11-desoxycortisol (specific compound S)' }) ]1 G: \/ ^/ V; A3 ~+ D, N
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-, B) E) u( R( h- r6 y0 Y
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total+ F4 b3 q! c% N/ }2 [
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
- g6 R$ @+ x) k8 J4 X- }: Cand β-human chorionic gonadotropin was less than# G: ?$ A) e) Q6 H; Z
5 mIU/mL (normal <5 mIU/mL). Serum follicular
$ E! f* F% b7 r7 U; S6 `9 v/ rstimulating hormone and leuteinizing hormone/ ?3 Z* x; g1 J! F7 w2 t
concentrations were less than 0.05 mIU/mL# o! H5 E. A/ Z2 S) J+ P. D7 j, Z
(prepubertal).
. [7 ` F1 o1 v( k; ^. \( h3 DThe parents were notified about the laboratory% V/ {; w: ^" ?1 m" f- K+ C4 D7 U1 p
results and were informed that all of the tests were' v( s% Q b3 d" {2 ^
normal except the testosterone level was high. The4 z. P: o% ~ f& ~
follow-up visit was arranged within a few weeks to
6 W/ a2 t5 V: {: I9 Uobtain testicular and abdominal sonograms; how-* B' ]9 h3 B& A' K1 U) r
ever, the family did not return for 4 months.& m' ]2 O$ W9 P1 A4 ?1 v7 l
Physical examination at this time revealed that the$ w6 }5 x9 b% q% M( i% a
child had grown 2.5 cm in 4 months and had gained7 p, l( ~% o6 X/ ~. i9 M) h4 K
2 kg of weight. Physical examination remained- l9 {) }/ p/ Y y( P1 m8 W
unchanged. Surprisingly, the pubic hair almost com-# V& j; k, @9 t3 D4 w1 `, }
pletely disappeared except for a few vellous hairs at, r' E7 _6 A/ @( z4 K. H, j
the base of the phallus. Testicular volume was still 2. g" R' }+ N* s
mL, and the size of the penis remained unchanged.5 o0 e8 k" ?3 ^. f. ?, A" H' j3 Z
The mother also said that the boy was no longer hav-8 K {) Y E5 k" L' C7 J
ing frequent erections." Q( y9 j4 K/ x$ F2 \2 o' X. W
Both parents were again questioned about use of( `0 ]& z' t% ^! n+ G5 d! q
any ointment/creams that they may have applied to
4 J) }6 U# y! pthe child’s skin. This time the father admitted the# M, m. d6 Q# [9 c$ p g% c! H
Topical Testosterone Exposure / Bhowmick et al 541
6 H( x# p9 H1 [/ H5 [- ]3 ~+ vuse of testosterone gel twice daily that he was apply-
" H/ P3 e& M, R' ying over his own shoulders, chest, and back area for7 e/ s3 s5 f* j B: ]/ H5 I
a year. The father also revealed he was embarrassed$ X2 @ q7 r7 ^1 j9 U
to disclose that he was using a testosterone gel pre-# w# A6 Y1 J! z b- l9 {/ ~1 i
scribed by his family physician for decreased libido4 `* o5 J' Q6 t* \& @' m: o
secondary to depression.0 i) {7 z/ U- [0 _
The child slept in the same bed with parents.
2 y- z' x3 m% i# u) d8 [6 W* qThe father would hug the baby and hold him on his7 e+ A- X3 \" L1 u. `
chest for a considerable period of time, causing sig-
+ V8 }5 C- a- I7 D* Fnificant bare skin contact between baby and father.; I9 `# j4 x0 ?% ^. a& K
The father also admitted that after the phone call,% C1 T# w. J8 w$ E
when he learned the testosterone level in the baby
6 x8 s$ w1 h$ k* Z; U1 [was high, he then read the product information9 w1 f& K$ C& p' e3 Y8 _& t( w
packet and concluded that it was most likely the rea-+ r- m$ k8 K4 B. O# v" O1 m }- k
son for the child’s virilization. At that time, they& C7 I7 A3 K& R; z! O
decided to put the baby in a separate bed, and the' b J! R+ b+ ~! N3 p
father was not hugging him with bare skin and had7 |: ~( K: x" W& m4 Y7 N/ A5 F1 A
been using protective clothing. A repeat testosterone* T" X) b4 |% g: m- R+ V
test was ordered, but the family did not go to the
2 |. y* d" a+ W) _% _7 a9 ^laboratory to obtain the test.
/ b; ~2 H$ N! a( KDiscussion
6 k- t* J0 k( W9 g. c+ F" lPrecocious puberty in boys is defined as secondary
# p$ U. o: R5 r" X* e+ Jsexual development before 9 years of age.1,45 D9 T, Q: r3 I
Precocious puberty is termed as central (true) when7 ]5 I" p6 E. ?8 Q w( e$ D9 @9 h9 x
it is caused by the premature activation of hypo-
# d: m0 [) P& M6 K% ]5 c8 Bthalamic pituitary gonadal axis. CPP is more com-
9 F' z7 {4 B5 i" d/ rmon in girls than in boys.1,3 Most boys with CPP
c1 t2 N0 B$ `% U1 t: Mmay have a central nervous system lesion that is: C; h+ F2 ?/ Y3 @) q0 R
responsible for the early activation of the hypothal-
! j: n& P$ Y; a$ Q0 d* U2 @amic pituitary gonadal axis.1-3 Thus, greater empha-# f! v" C( _) d
sis has been given to neuroradiologic imaging in- {7 b. @' y- |# f9 Q1 G5 n
boys with precocious puberty. In addition to viril-
2 O, X! K: H' e W( Cization, the clinical hallmark of CPP is the symmet-
3 U4 U0 D* O/ E3 N9 Urical testicular growth secondary to stimulation by
0 D7 V j7 N" W6 ^* J) f. O b6 egonadotropins.1,3! a0 H2 E' Y9 Z2 a8 N* z
Gonadotropin-independent peripheral preco-& u: Y- H4 v7 O* h# w; S
cious puberty in boys also results from inappropriate
% b* t7 i( R& e5 Xandrogenic stimulation from either endogenous or$ t& e3 b" |" S
exogenous sources, nonpituitary gonadotropin stim-! ]) y9 I) ^+ U
ulation, and rare activating mutations.3 Virilizing
2 z0 f% W8 ]0 f3 gcongenital adrenal hyperplasia producing excessive
# p% U+ E' b; A" A' ^( fadrenal androgens is a common cause of precocious) R0 f1 L1 u0 G
puberty in boys.3,45 A; \' w1 _1 z/ @
The most common form of congenital adrenal! a' }' B$ C. a; w9 Y3 m
hyperplasia is the 21-hydroxylase enzyme deficiency.
! B g! a) j* f3 ?The 11-β hydroxylase deficiency may also result in
; k1 k) J! I/ r! { w( @+ W1 Fexcessive adrenal androgen production, and rarely,/ \; R3 L& J$ N: ^- k5 {' [
an adrenal tumor may also cause adrenal androgen
5 l$ q" Y( Z$ p) Jexcess.1,3& u3 M6 i# }0 y x P3 Z x7 I1 s
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
! q& r0 `7 N2 G8 F2 k542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
1 E( i" z$ {, A7 UA unique entity of male-limited gonadotropin-
, R' y5 g7 x6 I3 iindependent precocious puberty, which is also known4 M: K, F, J& m4 U2 D. }+ p; z
as testotoxicosis, may cause precocious puberty at a
) c# y2 t4 U. s" V% w2 Jvery young age. The physical findings in these boys
; W8 I$ {1 i& x& y3 X2 F8 ?with this disorder are full pubertal development,
1 h# d5 |. K: F1 b7 k( Zincluding bilateral testicular growth, similar to boys/ c' c& c' |$ f
with CPP. The gonadotropin levels in this disorder
( \* S z! @) ware suppressed to prepubertal levels and do not show
9 t2 o* R( B1 L8 S3 @/ y: z: k/ K) epubertal response of gonadotropin after gonadotropin-
" |! P# E9 X7 y: yreleasing hormone stimulation. This is a sex-linked
3 U9 Q) Z! M. ?autosomal dominant disorder that affects only* E1 T8 ^' G0 y& n: d2 d+ x
males; therefore, other male members of the family
# n& H4 Z7 I. W4 c2 s6 ?: Mmay have similar precocious puberty.3
4 A, Z M; e/ W) ?' qIn our patient, physical examination was incon-
/ r1 X/ q8 ~' j: }sistent with true precocious puberty since his testi-- H1 K* w& f. h0 O7 d
cles were prepubertal in size. However, testotoxicosis1 ~' K: j4 B$ l) D& ?
was in the differential diagnosis because his father" D; H: X" {$ _( p
started puberty somewhat early, and occasionally,: e0 n- H4 I7 G9 N, k1 s3 B5 g
testicular enlargement is not that evident in the" |& U- l. \3 H. d, Q) B
beginning of this process.1 In the absence of a neg-
9 L+ T# U. S/ r5 v Fative initial history of androgen exposure, our
' l# j2 U9 K V4 J) i9 ~biggest concern was virilizing adrenal hyperplasia,
3 @/ v. M4 h, \$ q- v) s& Zeither 21-hydroxylase deficiency or 11-β hydroxylase
5 Z1 \7 c/ c5 O: S% k/ Q; udeficiency. Those diagnoses were excluded by find-
2 l' b$ V) D+ Y+ p9 d1 ping the normal level of adrenal steroids.% k* L# a; C% }
The diagnosis of exogenous androgens was strongly# c" Z; _ l! M/ [6 c3 e
suspected in a follow-up visit after 4 months because7 i$ g; L' F/ _7 y' D
the physical examination revealed the complete disap-
. `" x$ x* ?# M! p2 hpearance of pubic hair, normal growth velocity, and
2 @" {/ U2 t$ V* `) hdecreased erections. The father admitted using a testos-, z8 _9 o# v7 ?1 q4 ]4 z9 u' T
terone gel, which he concealed at first visit. He was v" a% P7 j, N6 I9 n& }' t
using it rather frequently, twice a day. The Physicians’4 j2 `' h( j6 o, v
Desk Reference, or package insert of this product, gel or
# f3 C4 ?' q0 p2 m& s7 Ecream, cautions about dermal testosterone transfer to. P( i" ~: {( l& j# H" l. r
unprotected females through direct skin exposure.
{8 c# |( H& B" p* z! pSerum testosterone level was found to be 2 times the
0 O* Y- t# c; C- I! ~! M$ Ybaseline value in those females who were exposed to
" y" u; o W; @* B9 L- b1 J7 I7 neven 15 minutes of direct skin contact with their male1 K4 _0 }$ v2 I: B& O3 k
partners.6 However, when a shirt covered the applica-5 h- x& ?& {: G- v
tion site, this testosterone transfer was prevented./ @$ j5 }; |( T. l8 {, l, ~7 k" j
Our patient’s testosterone level was 60 ng/mL, r0 E# F" T G
which was clearly high. Some studies suggest that! Z3 E1 E5 A8 k
dermal conversion of testosterone to dihydrotestos-) i" J( }# s! d R& g
terone, which is a more potent metabolite, is more
. L$ v! m% M# j3 [6 r2 b& q l, Nactive in young children exposed to testosterone
( S6 l! G0 o( }4 y1 |. ` o3 yexogenously7; however, we did not measure a dihy-
5 }2 D& _/ t3 ]% ~( p/ L, J3 fdrotestosterone level in our patient. In addition to* H. V# w* a9 D$ x$ P
virilization, exposure to exogenous testosterone in c- l; d" W, U0 x" a4 y
children results in an increase in growth velocity and
* u1 }0 m0 {" b6 h, n7 M! R, W* Cadvanced bone age, as seen in our patient.' F# y! l9 u8 d, U6 y- Q
The long-term effect of androgen exposure during( r% m' n9 h5 N( B) a# ?
early childhood on pubertal development and final
. h% W+ U2 C" Z# {adult height are not fully known and always remain3 ?: ]- V7 e) N! p P, o: p2 D+ c
a concern. Children treated with short-term testos-
9 J" N/ |9 v3 c! V- M: Jterone injection or topical androgen may exhibit some
9 \' _2 t. G( B7 {/ dacceleration of the skeletal maturation; however, after
0 T) l, K; p( g4 q/ j4 Jcessation of treatment, the rate of bone maturation0 u6 R3 g% B$ m: k1 b5 \
decelerates and gradually returns to normal.8,9$ Y! I& `9 ^% i
There are conflicting reports and controversy8 F! l# `; ]+ M, Y: v: Y8 G
over the effect of early androgen exposure on adult" ^. w/ Y( @' o: i: Y! m/ E
penile length.10,11 Some reports suggest subnormal" d1 V! U) @4 Y) c1 I' T; v. ?
adult penile length, apparently because of downreg-6 o, c7 g3 @9 ?
ulation of androgen receptor number.10,12 However,
1 y, y }6 [1 n* {- U$ SSutherland et al13 did not find a correlation between, v5 d0 _3 S$ D
childhood testosterone exposure and reduced adult8 A# j$ R' ]7 |& i# ]* V
penile length in clinical studies.
% ^2 s% h' w( R' ]3 s. GNonetheless, we do not believe our patient is
c: ~1 `' [+ Zgoing to experience any of the untoward effects from O G: I1 z6 U! r
testosterone exposure as mentioned earlier because/ G7 j2 l* K3 {& S$ T% Y; N
the exposure was not for a prolonged period of time.
1 C, l: J6 u4 m1 U7 y L6 b# ZAlthough the bone age was advanced at the time of
" C# n$ W1 x, W2 Qdiagnosis, the child had a normal growth velocity at
( x' x `6 V# I' f; V- tthe follow-up visit. It is hoped that his final adult
+ d! {! v2 Z) i; Jheight will not be affected.# g( @' S7 Z! A, k5 R
Although rarely reported, the widespread avail-
) n* `5 a" Z1 Z7 F3 G$ J Tability of androgen products in our society may
: }4 D( ]0 z) Gindeed cause more virilization in male or female
! W# n. Z! p7 d- w. gchildren than one would realize. Exposure to andro-
- l; }/ m# B- D3 c1 Bgen products must be considered and specific ques-
4 s8 k: [- f' f* o% A# }tioning about the use of a testosterone product or
' @5 ~) B2 X0 x, tgel should be asked of the family members during% b/ i& H6 j3 D9 N) z/ q0 m5 [
the evaluation of any children who present with vir-
) N$ k) C0 |- @/ ?# m8 Dilization or peripheral precocious puberty. The diag-
" u8 X3 @( N( ~- O& wnosis can be established by just a few tests and by
9 S; @1 U) v7 P) ]; Mappropriate history. The inability to obtain such a- j$ e1 y4 U' p2 H
history, or failure to ask the specific questions, may% m% T9 C& D. U2 n0 u7 c
result in extensive, unnecessary, and expensive: H7 _7 M, }" ~! z
investigation. The primary care physician should be4 t4 z. e3 X# t9 a, p
aware of this fact, because most of these children
+ }7 D# I/ r; ?; k/ N& {8 Vmay initially present in their practice. The Physicians’
1 I5 @( V+ M! i$ X& vDesk Reference and package insert should also put a3 Z$ c4 \; S* Z8 G9 \" \' J3 F
warning about the virilizing effect on a male or6 {6 c( B% z, S! I& f
female child who might come in contact with some- u% R2 D/ J9 F3 `4 G
one using any of these products.
. n4 D" Z2 h' H; o+ e& [6 w8 U" JReferences
: s1 t5 E/ h% _2 o1. Styne DM. The testes: disorder of sexual differentiation4 x+ A( r i3 Z! @1 j
and puberty in the male. In: Sperling MA, ed. Pediatric+ ~$ q, ^1 L& l( k
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
& c* ~+ J4 D: S2002: 565-628.* Y' v( Y; F4 c& t; n
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious2 _) @* f8 B F! ~' e5 ]0 ]
puberty in children with tumours of the suprasellar pineal) v6 ~2 d6 Y" V$ }; d/ w/ n
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
0 a9 r9 G( ?* |% y- R$ L9 zTopical Testosterone Exposure / Bhowmick et al 543
. f7 T' S |1 r8 mareas: organic central precocious puberty. Acta Paediatr., ]& v: V- C1 q4 n7 B) |/ h
2001;90:751-756.
1 J5 W' p% Y o% v. A3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.1 N) _/ S3 r& ~6 l- V3 c8 _7 ?) Q# p4 u
Pediatric Endocrinology. 4th ed. New York, NY: Marcel
% y) r, k% H6 [) zDekker Inc; 2003:211-238.& B" t K. U- n- C$ S
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual5 w4 `0 p* b7 N
development in a two-year-old boy induced by topical" o- M( ^( N( \: { q& v( e
exposure to testosterone. Pediatrics. 1999;104:e23.5 o* N0 K/ l' p% a9 q6 U0 H
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of! R0 {1 W& Z# `* w- q
Skeletal Development of the Hand and Wrist. 2nd ed.: f5 Z+ Y2 e* C8 [# N; [
Stanford, CA: Stanford University Press; 1959.3 R8 X; Q/ y k" h! @: h5 E2 y; p
6. Physicians’ Desk Reference. Androgel 1% testosterone,
! _2 Z w4 F1 y/ W: z" [Unimed Pharmaceutical Inc. Montvale, NJ: Medical0 g$ O* n6 A7 k8 D
Economics Company, Inc; 2004:3239-3241.
6 m# A& ^: t {: l+ d( d4 m7. Klugo RC, Cerny JC. Response of micropenis to topical/ [, ^% R O0 z+ Q/ |* n
testosterone and gonadotropin. J Urol. 1978;119:' G; Q0 W' P1 K6 \" m" U
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