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is a significant concern for physicians. Central* u; N- M6 F+ N9 W4 b6 f$ Z
precocious puberty (CPP), which is mediated# G6 a3 _: H# G" u# \
through the hypothalamic pituitary gonadal axis, has4 \1 d! m( D! m& a. G& u
a higher incidence of organic central nervous system B5 d1 B, @$ o; T
lesions in boys.1,2 Virilization in boys, as manifested! M. Y e5 X9 Z6 Y5 v
by enlargement of the penis, development of pubic" c! S# V6 D7 ~0 Y
hair, and facial acne without enlargement of testi-* z5 ]- {4 h( y$ j/ z
cles, suggests peripheral or pseudopuberty.1-3 We5 }# i4 a( e! m: S! D1 Q
report a 16-month-old boy who presented with the
$ [9 [3 X$ G6 w& \! x; G& _enlargement of the phallus and pubic hair develop-1 H% V$ p+ z x: G. J! x
ment without testicular enlargement, which was due7 I W: I+ S4 G" h
to the unintentional exposure to androgen gel used by6 @+ B/ N @, R4 H5 J
the father. The family initially concealed this infor-4 T0 z( S; c- A3 @
mation, resulting in an extensive work-up for this6 t# d& A/ L% J3 U7 `. n
child. Given the widespread and easy availability of! g. W" [5 I4 g7 e5 [$ ~
testosterone gel and cream, we believe this is proba-1 o. W7 p ~5 Y9 M. t T
bly more common than the rare case report in the) v8 ]! {# C1 g
literature.4
4 e- Q4 N& L; D8 ]; }Patient Report
+ V% r6 e0 ^9 A) }1 ^A 16-month-old white child was referred to the8 L# j) Y, a6 p' U/ x9 H. F4 f: y- \
endocrine clinic by his pediatrician with the concern. U4 I8 |0 k* F0 O6 b$ W+ Z! n0 ^
of early sexual development. His mother noticed
3 T' t4 j" S# _. ^light colored pubic hair development when he was- F+ N' |, ?* d$ Y
From the 1Division of Pediatric Endocrinology, 2University of: ]: A" K: Y8 ^, i( T- r5 Z
South Alabama Medical Center, Mobile, Alabama.
! K2 E j* ?7 ]% B9 U t+ fAddress correspondence to: Samar K. Bhowmick, MD, FACE,+ ~; W3 ^& R1 N
Professor of Pediatrics, University of South Alabama, College of
/ g& `; p2 p3 |5 ]' s7 EMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
1 I( U3 u# {( _4 L" Y* p# s8 ?e-mail: [email protected].
1 j5 ^0 W1 h$ o. tabout 6 to 7 months old, which progressively became+ z7 {0 ^4 K, X- R, h3 p& d
darker. She was also concerned about the enlarge-
3 o! @9 A6 ? R* N. C3 |ment of his penis and frequent erections. The child
; {1 O! H9 s* G7 L+ Z& u1 }was the product of a full-term normal delivery, with
' V9 k0 B+ E/ I! U; N4 o; ta birth weight of 7 lb 14 oz, and birth length of
. a( L7 }7 I+ v, W I20 inches. He was breast-fed throughout the first year
3 e8 G5 i1 u- E5 m6 u$ X9 `9 w; Hof life and was still receiving breast milk along with& C/ _% G. ?4 V. M1 d' n5 X- R# @
solid food. He had no hospitalizations or surgery," O, l7 z& P7 V( Z
and his psychosocial and psychomotor development& Q4 t6 t7 X5 T; G9 m" R* S
was age appropriate.
: P8 Q: `- W+ R$ I4 JThe family history was remarkable for the father,. M0 I1 l0 D9 S/ Q4 j! H
who was diagnosed with hypothyroidism at age 16,- K6 @# Z, |% G' k* R
which was treated with thyroxine. The father’s( C2 p5 V# ~# Y
height was 6 feet, and he went through a somewhat
( Z4 c! n9 a" X7 {2 I$ u0 learly puberty and had stopped growing by age 14.
8 p5 a9 }! t3 c: I) l& A2 TThe father denied taking any other medication. The
0 G3 t/ N. A7 {' E6 d. e' b8 h9 Achild’s mother was in good health. Her menarche
9 c W( n5 E" j& h% ^was at 11 years of age, and her height was at 5 feet* {% l2 [( W) W0 e" `0 \9 s; c
5 inches. There was no other family history of pre-
! N$ Z' I2 t, E( h& mcocious sexual development in the first-degree rela-9 V! a: ]$ u+ B9 C+ @/ q4 j; F
tives. There were no siblings.* [$ s7 T, E) A# o0 ]6 m# p* U2 m
Physical Examination5 x. W3 G3 o& b- g
The physical examination revealed a very active,8 F( I3 r6 c7 T1 B5 s
playful, and healthy boy. The vital signs documented
, G+ o( c& w. Ma blood pressure of 85/50 mm Hg, his length was
1 c6 t/ p9 ]! L90 cm (>97th percentile), and his weight was 14.4 kg/ q3 [- d4 x1 a: A/ ]
(also >97th percentile). The observed yearly growth7 D) Z2 i( O, w0 m& z& d
velocity was 30 cm (12 inches). The examination of
; ]8 O( i+ `3 R" W5 _1 u' gthe neck revealed no thyroid enlargement.: s9 n# w# f% O4 r- V$ ]' d
The genitourinary examination was remarkable for$ G6 z, j' V/ c( Q @1 K; @ e0 f
enlargement of the penis, with a stretched length of5 E- D% V- e1 q8 G) F4 B
8 cm and a width of 2 cm. The glans penis was very well( E4 m$ S! E/ x, u
developed. The pubic hair was Tanner II, mostly around) e+ m5 o! C: z3 U" t' g4 S
540
) n6 M! E* e2 C7 m: `at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
i+ z% M* G1 |8 Ythe base of the phallus and was dark and curled. The
' h+ u/ {/ ^( s4 X H& e1 ]testicular volume was prepubertal at 2 mL each.5 _9 v' @! z% w5 k% `/ y0 Z
The skin was moist and smooth and somewhat
! ^9 h* @ @' O! }; Uoily. No axillary hair was noted. There were no
2 v) W3 a! D: r" l. R$ A9 kabnormal skin pigmentations or café-au-lait spots.
7 a) [6 ]8 v$ G/ ZNeurologic evaluation showed deep tendon reflex 2+
# t' G* u; G7 i# Z3 xbilateral and symmetrical. There was no suggestion
2 P( H0 p& f& [0 Zof papilledema./ Y* Y9 f0 w1 S" b
Laboratory Evaluation
! d/ n8 b/ I6 P/ f& `0 v9 GThe bone age was consistent with 28 months by7 b v8 u1 k1 P' l" d2 Z: W! K
using the standard of Greulich and Pyle at a chrono-0 x! ^5 D" }# D
logic age of 16 months (advanced).5 Chromosomal
, x0 a' f6 ~- N5 z( h+ W1 P7 N# D' Zkaryotype was 46XY. The thyroid function test9 A' j. R" _( _* N
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
: I ~5 f2 R x9 g+ t7 ]0 M* Q# ?lating hormone level was 1.3 µIU/mL (both normal).
3 j' P* B5 ]4 q: V/ [The concentrations of serum electrolytes, blood
, D8 Q8 ~" G" X% `urea nitrogen, creatinine, and calcium all were
: o* n- G7 c- H0 Rwithin normal range for his age. The concentration& j9 Y! r1 k( P0 b
of serum 17-hydroxyprogesterone was 16 ng/dL
' S) x1 d1 O4 H(normal, 3 to 90 ng/dL), androstenedione was 20
& u# H; ^" c* A0 i" _ R; k) Mng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
- V1 C( G% `- K/ lterone was 38 ng/dL (normal, 50 to 760 ng/dL),
j9 c' _6 j. t2 wdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
/ o' ^4 N I: z! m' r% U* u49ng/dL), 11-desoxycortisol (specific compound S)
1 R, C9 z7 {% E6 t7 N# xwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-& ?! i8 |' ^; T$ f! T( @; u
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total" X7 E/ B& o/ Q( Q
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
/ J: |9 U) j7 ]5 o* O& ]% zand β-human chorionic gonadotropin was less than- |+ ~3 n$ L& C- z' a* o: j% P
5 mIU/mL (normal <5 mIU/mL). Serum follicular% h$ T( J; z' K+ `0 c. H( E# _5 F4 E
stimulating hormone and leuteinizing hormone
$ |7 M0 H! F) {. @1 Sconcentrations were less than 0.05 mIU/mL$ Q& a V5 j: v: o! j
(prepubertal).
6 ~9 O3 {" }5 m R/ a$ LThe parents were notified about the laboratory
* H' n6 G% D( F6 g- C! ]: d$ G6 sresults and were informed that all of the tests were
/ i. D. G0 _0 @* ~" s% Onormal except the testosterone level was high. The
$ V3 x- F _6 I/ ofollow-up visit was arranged within a few weeks to) B3 d9 z) R; E1 O. ~/ p
obtain testicular and abdominal sonograms; how-
; v! f# E( s- a. `" `: oever, the family did not return for 4 months.
4 x" y+ R3 n F9 e6 @3 p, q' FPhysical examination at this time revealed that the3 b( v7 e% q6 I+ |$ ?
child had grown 2.5 cm in 4 months and had gained
+ U( X* R0 e7 i8 Q1 n d1 K9 o2 kg of weight. Physical examination remained
9 C e+ b1 a$ W/ `2 \ }. V: W C2 Uunchanged. Surprisingly, the pubic hair almost com-
% R+ H3 s! I# e- Wpletely disappeared except for a few vellous hairs at6 G- M) m5 k0 Y3 {; m8 a7 Q3 j+ w! j
the base of the phallus. Testicular volume was still 2
' S% e d/ r, A9 h* U9 |# z gmL, and the size of the penis remained unchanged.! k/ _& s1 g; ]" Z( ]) u8 _. B0 b+ \
The mother also said that the boy was no longer hav-
7 i( c: M; Q- ?0 Z; e# King frequent erections.6 S) c1 y; b; s2 |
Both parents were again questioned about use of: V6 X5 | ~2 K
any ointment/creams that they may have applied to- z# A3 | Y, \. ^5 `2 x, Z* Q
the child’s skin. This time the father admitted the
P% O% r9 \5 ]8 t3 [0 T' Z; \7 } gTopical Testosterone Exposure / Bhowmick et al 541% A$ F$ a4 h8 l8 [
use of testosterone gel twice daily that he was apply-% s- R5 h& |3 c+ h
ing over his own shoulders, chest, and back area for
. m( K1 S1 G6 K9 e1 [1 a; Ma year. The father also revealed he was embarrassed
6 ~* ~6 Q/ Q; R; ^, x1 Yto disclose that he was using a testosterone gel pre-
5 C% w1 ?8 s/ j% f1 jscribed by his family physician for decreased libido) n/ C. r7 u0 x5 W7 j4 A
secondary to depression.
# _; f' n4 p$ K. o# g2 v6 pThe child slept in the same bed with parents.- i5 ? y: {' T
The father would hug the baby and hold him on his
$ ^, w) g+ W8 u: fchest for a considerable period of time, causing sig-
7 W9 o# N( X+ ?9 `& R, V7 ^nificant bare skin contact between baby and father.. @& v* a# K) f. J# O4 c+ l
The father also admitted that after the phone call,. J- |5 d& @/ i. J5 K9 ~/ K
when he learned the testosterone level in the baby
, v0 U3 ^3 s1 _* y, cwas high, he then read the product information
" L4 C" G, t3 m) f9 |packet and concluded that it was most likely the rea-: K9 B4 m& y$ H0 j% ]' n
son for the child’s virilization. At that time, they
) l5 @; v0 Z. f% J" Adecided to put the baby in a separate bed, and the6 r" p5 k9 U# U8 w# l
father was not hugging him with bare skin and had) k. R3 C8 \, r2 X7 I! L* i
been using protective clothing. A repeat testosterone- @3 I* \; t- ^+ U" x2 h
test was ordered, but the family did not go to the# M( I+ P: i, @, {9 x7 X% A6 ]
laboratory to obtain the test.
1 c( S; c7 W/ d5 j% }& a8 jDiscussion7 s+ B: V4 r2 i+ U
Precocious puberty in boys is defined as secondary8 S- T0 \ r2 m% u3 T+ n- C
sexual development before 9 years of age.1,4
% B, n) x; E L0 r) dPrecocious puberty is termed as central (true) when
/ i/ _. Y! r& }( nit is caused by the premature activation of hypo-+ E0 T: l4 q) {# E
thalamic pituitary gonadal axis. CPP is more com-7 ~; V. n5 Y& p; G# t
mon in girls than in boys.1,3 Most boys with CPP
8 C0 g3 i, _' z# Wmay have a central nervous system lesion that is7 ~' w6 G% A H9 L# N
responsible for the early activation of the hypothal-
0 G. e) l) }" m3 \- Famic pituitary gonadal axis.1-3 Thus, greater empha-
; Q! A9 {! ~9 y' v( wsis has been given to neuroradiologic imaging in# V* v/ r2 I1 l$ }3 r+ z' d; H$ ]: k
boys with precocious puberty. In addition to viril-" w. L6 d! W- K U D
ization, the clinical hallmark of CPP is the symmet-
8 Q" e' S2 P: H, I, _ W7 Drical testicular growth secondary to stimulation by2 x3 M# w' C9 v
gonadotropins.1,3
5 y2 h( Y, L0 `! _Gonadotropin-independent peripheral preco-& K8 X! J3 O, f8 g1 B; [
cious puberty in boys also results from inappropriate. C4 P" B9 d7 |) T* \
androgenic stimulation from either endogenous or9 t4 F n$ W9 `+ n4 j! q7 h
exogenous sources, nonpituitary gonadotropin stim-9 v0 c" X% U/ S9 f4 S+ R
ulation, and rare activating mutations.3 Virilizing1 Y2 ?8 o9 _/ D: A4 O# G
congenital adrenal hyperplasia producing excessive7 P! s# e, m# \7 }* k1 _/ ]' R( }
adrenal androgens is a common cause of precocious( N1 D$ i) n; z
puberty in boys.3,4
C- a7 c$ @3 _: ]0 _The most common form of congenital adrenal8 f! p* }+ b7 J* L
hyperplasia is the 21-hydroxylase enzyme deficiency.
- G) W% Z3 \" \& H' h" XThe 11-β hydroxylase deficiency may also result in
" X Z7 D4 j/ Iexcessive adrenal androgen production, and rarely,
% ~8 o0 S' ?& zan adrenal tumor may also cause adrenal androgen2 \+ j' ~5 T1 v( A
excess.1,3
9 @, w% ?2 x- c" [at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
8 t7 \8 a( u# C" A, {. P542 Clinical Pediatrics / Vol. 46, No. 6, July 2007' U8 a0 n+ ^* i+ I1 j, K' [ {9 W( M: ]
A unique entity of male-limited gonadotropin-
/ \ H p/ X* h' ?; I# G% Rindependent precocious puberty, which is also known$ J) Y `: U& W2 Q$ |9 ^1 S6 ^
as testotoxicosis, may cause precocious puberty at a+ F. [5 W' W" y, A/ @
very young age. The physical findings in these boys
3 L/ q5 Z1 w8 T+ B) _: ~with this disorder are full pubertal development,: p/ U7 @* r. O# c
including bilateral testicular growth, similar to boys! y! ^8 B' S! Z; q0 D K2 h
with CPP. The gonadotropin levels in this disorder0 C* ?7 O5 o' v$ ]2 W
are suppressed to prepubertal levels and do not show
6 f4 v; \; w2 Q4 T- ?% Apubertal response of gonadotropin after gonadotropin-
8 [! x4 C- B5 P& T7 Qreleasing hormone stimulation. This is a sex-linked
9 q8 G: T2 J& U7 n1 }* Y2 `autosomal dominant disorder that affects only( G# |6 P0 @2 }
males; therefore, other male members of the family$ ^3 d; N0 E8 y, N [
may have similar precocious puberty.3$ g! K- ~% \' K' K; R) E
In our patient, physical examination was incon-
' W" B0 b& l- R/ @sistent with true precocious puberty since his testi-/ B5 g6 A o1 L5 b6 C1 i
cles were prepubertal in size. However, testotoxicosis9 w& L% D3 O7 n9 a4 m* e" ?" T
was in the differential diagnosis because his father
0 W$ c4 c# E' m; Qstarted puberty somewhat early, and occasionally,
6 q/ b$ a/ z2 p" t7 s! ?# wtesticular enlargement is not that evident in the1 O1 p! @% A/ h8 |, r/ n
beginning of this process.1 In the absence of a neg-9 q/ t: {$ u/ L% ?9 Y
ative initial history of androgen exposure, our
4 g9 Y+ x) r8 t! E$ W9 |biggest concern was virilizing adrenal hyperplasia,
$ v0 O+ I* R0 S! p9 R. teither 21-hydroxylase deficiency or 11-β hydroxylase
7 S( L' L7 ` vdeficiency. Those diagnoses were excluded by find-
% G) O: l! T$ a- iing the normal level of adrenal steroids.( g/ j8 P3 m" |" U7 I5 g) |
The diagnosis of exogenous androgens was strongly
1 B+ }0 Q& E2 esuspected in a follow-up visit after 4 months because
' }5 y/ f% T5 z8 m/ r- m+ Mthe physical examination revealed the complete disap-
' d) w, n) M# [ x; n. `4 Kpearance of pubic hair, normal growth velocity, and) l0 c0 B( ]) c! @# d* x; G4 l
decreased erections. The father admitted using a testos-* \7 L! W) f% m& z: p
terone gel, which he concealed at first visit. He was$ K& P8 `( \' {4 E! U, D9 h* ?; e! e
using it rather frequently, twice a day. The Physicians’
( `5 N0 n7 y3 B- K2 Z% fDesk Reference, or package insert of this product, gel or2 t# q- a; w. _) Q( z8 V1 v0 s/ J$ O
cream, cautions about dermal testosterone transfer to! p( n4 ^5 e" [$ n+ L
unprotected females through direct skin exposure.1 i) G) T6 o q4 a5 D8 H
Serum testosterone level was found to be 2 times the
& J- o# G" b7 L% K" O. J4 ^6 `) mbaseline value in those females who were exposed to; h$ I. ~0 c; Q2 u1 G
even 15 minutes of direct skin contact with their male8 R. V" _6 |# {0 C
partners.6 However, when a shirt covered the applica-) J8 z7 E4 X0 { L6 X+ |2 L
tion site, this testosterone transfer was prevented.& I( A% @9 \! |' z7 ?
Our patient’s testosterone level was 60 ng/mL,
! Y5 D$ k: Q2 w% g& awhich was clearly high. Some studies suggest that
& n& m$ H' s% J0 i/ \5 adermal conversion of testosterone to dihydrotestos-
; O: D: c+ Q j, c. }9 J8 j5 Aterone, which is a more potent metabolite, is more( l* v1 m. {$ ~
active in young children exposed to testosterone
' o- O1 D, `. t# m9 F& F- r: J9 @exogenously7; however, we did not measure a dihy-
% Z! U+ z8 x& R# \drotestosterone level in our patient. In addition to6 N- {. a7 N' @1 t. u
virilization, exposure to exogenous testosterone in
- U0 w1 Z+ w3 t# j# r( g! E8 A1 tchildren results in an increase in growth velocity and
6 N I6 \6 ^0 v1 s) z) zadvanced bone age, as seen in our patient.
: p$ a! I" c& \The long-term effect of androgen exposure during
, |3 B- \9 v+ Jearly childhood on pubertal development and final
& I0 d; l+ u+ c& |$ eadult height are not fully known and always remain9 b9 h E' y2 {- [# S+ S
a concern. Children treated with short-term testos-" l5 w% R. E' T; O f: r
terone injection or topical androgen may exhibit some. `& Y& F" F1 J) o9 U% W" s4 T6 S8 \
acceleration of the skeletal maturation; however, after$ H3 J- F s* \
cessation of treatment, the rate of bone maturation7 C/ Y. U* U3 Y! @( T; u1 o
decelerates and gradually returns to normal.8,9! E$ q7 e& @; B# {; \2 J; D! f; l
There are conflicting reports and controversy
2 H* Y+ ^. T$ v; ~+ Hover the effect of early androgen exposure on adult/ u1 D0 ]6 c. _
penile length.10,11 Some reports suggest subnormal
( @. n0 ^( X$ O4 T, sadult penile length, apparently because of downreg-5 q H- g- `, `. l/ {, D* U; p
ulation of androgen receptor number.10,12 However,
- k8 g* `% e, V: o# JSutherland et al13 did not find a correlation between
( N# q! F) r3 F. E h& ^% vchildhood testosterone exposure and reduced adult
9 |3 e9 O- }$ {: v- ypenile length in clinical studies.) M( |2 M. a# A: [3 v" M
Nonetheless, we do not believe our patient is
: z& L" j8 m/ i7 {/ Z) @going to experience any of the untoward effects from
# G+ `' f5 i$ D& ?) {testosterone exposure as mentioned earlier because
" E2 b! l. Z3 ?) f) f8 vthe exposure was not for a prolonged period of time.- v) c% j% r8 [6 ~
Although the bone age was advanced at the time of# x; X! N) p8 j+ H# _$ ]
diagnosis, the child had a normal growth velocity at
1 f; ^! M/ k7 b& P% k6 ~& c9 bthe follow-up visit. It is hoped that his final adult+ {8 _- c& m& `) n, b& P# ~
height will not be affected.
, G( u+ b: T2 n5 m2 r& d7 {# D& CAlthough rarely reported, the widespread avail-1 U9 f o3 i: G8 ^
ability of androgen products in our society may
# w, L5 s9 l# tindeed cause more virilization in male or female6 T! L0 G0 l" x- Q( _
children than one would realize. Exposure to andro-; a, j) z/ z' D' q
gen products must be considered and specific ques-
l6 ~8 {+ J: J, ~/ T! {- {) @tioning about the use of a testosterone product or, j0 d4 J4 a$ B c
gel should be asked of the family members during$ u5 j+ L6 i) \) F
the evaluation of any children who present with vir-7 a' |9 r/ Q7 {0 a8 e5 }$ L
ilization or peripheral precocious puberty. The diag-/ H- V0 F& O- k( K
nosis can be established by just a few tests and by
. X" E" @( K x/ h) Oappropriate history. The inability to obtain such a
# z0 [6 P. w, e4 ~history, or failure to ask the specific questions, may
$ c# b. K+ @6 R! h, ]" @result in extensive, unnecessary, and expensive; v) i& q1 d2 d" {* |# @ x
investigation. The primary care physician should be+ W2 l6 \) _6 l" G3 U6 E
aware of this fact, because most of these children4 n$ ^& w& o3 C% k$ _; E3 L2 \
may initially present in their practice. The Physicians’
$ d6 B- Z0 J. {3 M, N- ~Desk Reference and package insert should also put a
- M7 [: {6 b% A: F7 Fwarning about the virilizing effect on a male or2 g$ |3 R& z- c! j, q
female child who might come in contact with some-# Q. P: p5 x3 [, V0 D1 w# v
one using any of these products.
7 k: U7 I3 g& N- f9 b1 k" aReferences7 H- f6 V, Z" o. [9 `1 e
1. Styne DM. The testes: disorder of sexual differentiation
7 E5 U/ x# k( p, v0 B+ S8 R& Zand puberty in the male. In: Sperling MA, ed. Pediatric
" x' n/ z; G6 gEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;- e1 r6 l5 y8 z6 C7 J* ?: |, ]( t; x
2002: 565-628.
5 p% T( w0 L; H0 v- [2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious. \ b- G+ g1 n9 D1 j
puberty in children with tumours of the suprasellar pineal
" X3 O5 Q. N2 W: |) D1 V) `( oat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
7 ?0 z" ^+ g/ [/ P; Z& ATopical Testosterone Exposure / Bhowmick et al 543$ t0 O# b6 `& A; ^) a' i- `
areas: organic central precocious puberty. Acta Paediatr.
, g' ?. `" M3 m# Q; p4 c2001;90:751-756.# p( J2 A3 k1 e' S& }. M, H
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
) p: y: |4 | Z, m3 ^/ ]$ gPediatric Endocrinology. 4th ed. New York, NY: Marcel+ ~0 z: ~2 b( r* v/ @
Dekker Inc; 2003:211-238.& H$ c+ v: B7 n4 j1 y1 X8 N
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual k; [! Q7 p1 s
development in a two-year-old boy induced by topical7 |: u& @' |: f
exposure to testosterone. Pediatrics. 1999;104:e23.2 ~" L4 d: C0 ]2 x
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of: ]; J. m* s* e0 k O3 X% T+ U4 x
Skeletal Development of the Hand and Wrist. 2nd ed.
( K5 X3 @$ q* Z' k) A" BStanford, CA: Stanford University Press; 1959.) p9 Q- @* h: A
6. Physicians’ Desk Reference. Androgel 1% testosterone,! t8 I/ d0 {& Z& |. @
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
! z3 \' D! v. z" ~+ @5 OEconomics Company, Inc; 2004:3239-3241.2 Z& Z A0 w9 R8 Z* L
7. Klugo RC, Cerny JC. Response of micropenis to topical
' q# A, h0 M% o" r! Atestosterone and gonadotropin. J Urol. 1978;119:
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