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is a significant concern for physicians. Central
8 X; n/ ]$ i2 J. G7 }precocious puberty (CPP), which is mediated
+ e/ K% x; j1 Q4 Q; J7 Kthrough the hypothalamic pituitary gonadal axis, has E# |; ~2 o+ v. V! K
a higher incidence of organic central nervous system
1 Q3 {4 ?- N( a( v1 {* Mlesions in boys.1,2 Virilization in boys, as manifested- b" j# s6 L7 G6 K+ u+ R. F
by enlargement of the penis, development of pubic
+ u- A2 }+ _& b! | uhair, and facial acne without enlargement of testi-
6 {; c+ X; P+ G- f6 R) Wcles, suggests peripheral or pseudopuberty.1-3 We! e- m, e9 L, x7 g0 H
report a 16-month-old boy who presented with the4 L" b- h2 Q) l7 A Z9 f
enlargement of the phallus and pubic hair develop-9 b- P+ O: T8 V; L, @6 L
ment without testicular enlargement, which was due5 n" h5 \* Z1 m( j$ p
to the unintentional exposure to androgen gel used by7 Q7 n+ l8 W% |: x( }/ u. Q
the father. The family initially concealed this infor-
) ]0 q6 w( O1 W4 H! R3 i$ c1 Imation, resulting in an extensive work-up for this
; q- {) L. x2 k; ^2 rchild. Given the widespread and easy availability of- ^: W3 m: d- S* V- o0 Y
testosterone gel and cream, we believe this is proba-
- N" n) U8 |* k3 X7 j" Dbly more common than the rare case report in the
" S8 h" J% ]6 m7 B. K; \literature.4
* M, W/ F( z. BPatient Report+ ~7 U7 h( ]6 c4 s/ X9 G
A 16-month-old white child was referred to the
/ C" s, Q3 t8 M. O) mendocrine clinic by his pediatrician with the concern5 V4 }) I7 N2 ?4 @' r( B6 I1 u
of early sexual development. His mother noticed( h% w/ F" j; X6 A7 [. J
light colored pubic hair development when he was" Z; `# z# M, B0 I2 \3 U. D. {
From the 1Division of Pediatric Endocrinology, 2University of4 K5 T, h, i S1 m, l7 ]; f) m) `
South Alabama Medical Center, Mobile, Alabama.! j2 ?- W# W; T3 G; y
Address correspondence to: Samar K. Bhowmick, MD, FACE,
3 c/ E2 S _: }* _3 [Professor of Pediatrics, University of South Alabama, College of
0 f! b) U& C) `5 f0 FMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;) f: Q9 |2 z: G5 j
e-mail: [email protected]./ e' J- u5 G& k7 w: m* V
about 6 to 7 months old, which progressively became* r& R& @" l4 D
darker. She was also concerned about the enlarge-- o7 @- g9 e/ s2 q/ r& U2 ~- Z J
ment of his penis and frequent erections. The child
3 a m0 B4 Y' W( Mwas the product of a full-term normal delivery, with
5 z0 j5 }5 b+ J& ?# Ya birth weight of 7 lb 14 oz, and birth length of
& S1 P9 `$ w- i8 o# R" b20 inches. He was breast-fed throughout the first year6 S' T7 ^% H! i3 k5 N/ `/ _
of life and was still receiving breast milk along with! G0 o9 ]" V; z( f. w* y
solid food. He had no hospitalizations or surgery,
2 h, G6 w& b2 j( Y3 Gand his psychosocial and psychomotor development5 F" t( ^- H% J
was age appropriate.* r0 T3 { i8 Z% i
The family history was remarkable for the father,
- m9 N, ` f! g1 l+ f/ vwho was diagnosed with hypothyroidism at age 16, w* L7 t1 I, r5 P
which was treated with thyroxine. The father’s
/ [5 J+ |) ^3 f& yheight was 6 feet, and he went through a somewhat
' O% J2 o+ E1 B% `1 mearly puberty and had stopped growing by age 14.
0 u( N2 ~3 c. H2 q" U( e: _1 l' W. UThe father denied taking any other medication. The
! D2 A2 W8 X" Q; N* n( G9 wchild’s mother was in good health. Her menarche9 y3 ~2 K" L. \: C0 u' w- U
was at 11 years of age, and her height was at 5 feet6 ?/ j' H) T; v% J/ H2 {
5 inches. There was no other family history of pre-; V5 m) F2 ~/ F
cocious sexual development in the first-degree rela-
% a& F# v5 y. E! A1 Dtives. There were no siblings.
3 m) ^6 ]) d o- @0 D |Physical Examination% J6 X1 z* Z7 a5 [
The physical examination revealed a very active,; f5 |. z @* ^/ \7 x' D
playful, and healthy boy. The vital signs documented6 G: A4 v! ?% b
a blood pressure of 85/50 mm Hg, his length was
. J/ G: S3 I% C) S9 x& W90 cm (>97th percentile), and his weight was 14.4 kg
4 n( m* B, i# F' X5 y) I- T& O(also >97th percentile). The observed yearly growth: ?: Y- j2 {9 v$ A/ V2 g7 Q& A
velocity was 30 cm (12 inches). The examination of
) i+ L4 Y- d( ^ p: P& ~3 @the neck revealed no thyroid enlargement.( S# Q( R6 \/ T6 }' ?& t
The genitourinary examination was remarkable for5 d1 u: f: u, U" S2 M
enlargement of the penis, with a stretched length of* C# j9 ~0 p' I
8 cm and a width of 2 cm. The glans penis was very well
0 w" S: _" F) X1 V8 tdeveloped. The pubic hair was Tanner II, mostly around
8 a5 A1 ]1 c2 s% u' }6 q5405 ?) D3 o& {4 S2 U# E3 [& L
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
) s3 T" b- |4 E' T9 Vthe base of the phallus and was dark and curled. The
: n- r- Q$ U+ G' j9 u/ i3 X" ttesticular volume was prepubertal at 2 mL each.
2 n7 f b3 d5 |The skin was moist and smooth and somewhat5 u- w, B u$ Q5 L
oily. No axillary hair was noted. There were no% {! h! C: C$ W9 }7 q8 X0 c% S
abnormal skin pigmentations or café-au-lait spots.
^0 ]; ^) g4 ]9 ]4 l4 ]Neurologic evaluation showed deep tendon reflex 2+
\7 O$ B5 Y9 _5 p Jbilateral and symmetrical. There was no suggestion' A; I9 J- ?7 N% m
of papilledema.4 m" A" G0 J L t& D/ ]6 p( S
Laboratory Evaluation9 m& a; a& |2 A+ H1 ?2 ^
The bone age was consistent with 28 months by
) _& U" O2 Q( g; v& pusing the standard of Greulich and Pyle at a chrono-
& t* }8 e5 y* i' Y# H6 ylogic age of 16 months (advanced).5 Chromosomal
c& w* j. O) T7 w% Z( g2 x2 ukaryotype was 46XY. The thyroid function test3 T P/ ]) j3 c* Y# z4 v" P; f
showed a free T4 of 1.69 ng/dL, and thyroid stimu-. t3 w% ]) P2 |1 M
lating hormone level was 1.3 µIU/mL (both normal).3 U* I8 A" g) J) b* m0 Q# Y+ h
The concentrations of serum electrolytes, blood0 u7 V2 M' x% u' @- U/ S! W7 x. ?
urea nitrogen, creatinine, and calcium all were
4 d3 A+ S( m: V8 D5 l0 K. awithin normal range for his age. The concentration5 f- F& D: |4 L0 w' x |
of serum 17-hydroxyprogesterone was 16 ng/dL) s" U0 }: `( j: W7 _
(normal, 3 to 90 ng/dL), androstenedione was 20
, o/ w4 k: G) png/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
( N/ x# c( r, E1 J2 l/ lterone was 38 ng/dL (normal, 50 to 760 ng/dL)," @$ a3 M5 J/ u! z: h4 u4 S% C
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
+ a! q: K5 v3 f) Q' I5 X5 _7 Q49ng/dL), 11-desoxycortisol (specific compound S)0 A5 F L3 X" n/ z6 A
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
' e8 i( |* \) ]0 P2 Btisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
) M0 N# P/ e* O1 Xtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
9 _0 ?: P# n3 B% \' L& L* dand β-human chorionic gonadotropin was less than1 x& u @" v& _" d( s+ E0 J
5 mIU/mL (normal <5 mIU/mL). Serum follicular1 W0 }+ E% U! F8 a4 a1 ~8 J* X4 ]. y
stimulating hormone and leuteinizing hormone7 i8 k; h. K: q: A/ }
concentrations were less than 0.05 mIU/mL
1 L3 P% i$ ^" D7 e0 S(prepubertal).
* R( W( Z" j' o8 L6 B2 \8 P& J% kThe parents were notified about the laboratory1 l4 x7 `; R9 H: l" L% @$ I
results and were informed that all of the tests were+ e, Q$ b% p1 h }6 ?
normal except the testosterone level was high. The6 r: H) L: I& U' o; Y+ O
follow-up visit was arranged within a few weeks to0 A& u# J/ L4 c0 e' X! g+ F3 G
obtain testicular and abdominal sonograms; how-9 K5 D; _5 j7 i
ever, the family did not return for 4 months.3 [' m$ ~% ^2 D
Physical examination at this time revealed that the
6 A% W B# F n. O S; Nchild had grown 2.5 cm in 4 months and had gained
1 T8 i, ~: Y4 H& M/ g5 F2 kg of weight. Physical examination remained- [& _8 |0 O0 h7 l" \! ]; a
unchanged. Surprisingly, the pubic hair almost com-0 }0 }3 t* O j. {3 J6 Q
pletely disappeared except for a few vellous hairs at
2 u1 e5 y8 s$ T5 A! Z/ o% |the base of the phallus. Testicular volume was still 20 t8 @: ^' [/ |3 y6 Y2 ^5 V
mL, and the size of the penis remained unchanged.* b/ L+ Y4 W/ g! q9 U4 t
The mother also said that the boy was no longer hav-
# u& A5 b" T5 F6 k7 bing frequent erections.6 M/ a- B' e+ a
Both parents were again questioned about use of
# i2 g( M7 ~' N( R& w2 ~' W* Tany ointment/creams that they may have applied to$ P7 k9 M, r `$ P; r
the child’s skin. This time the father admitted the
5 _- O$ _; ]& ~! q1 l, _) lTopical Testosterone Exposure / Bhowmick et al 5416 x! w; H* z6 U8 h& {5 u1 \
use of testosterone gel twice daily that he was apply-
$ v k( V& x0 e, C3 l0 ~ing over his own shoulders, chest, and back area for- h4 q, g8 @6 z; k3 M# t' Y
a year. The father also revealed he was embarrassed
% x6 O9 Y9 `& f* }# v) uto disclose that he was using a testosterone gel pre-* t0 g9 h2 z% |2 {5 W
scribed by his family physician for decreased libido
/ r9 s4 ]( g$ E& isecondary to depression., O& A ^$ g" [. Q" P
The child slept in the same bed with parents.
* L/ g& _+ \/ A. S1 Z4 @The father would hug the baby and hold him on his1 W; c' J6 Q& V4 M' L
chest for a considerable period of time, causing sig- D2 e+ }* c3 O0 u% H Q& B
nificant bare skin contact between baby and father.
* z6 o- i9 T IThe father also admitted that after the phone call,
1 B( H- S3 J8 Qwhen he learned the testosterone level in the baby: |# i/ h* o9 ~9 W7 d
was high, he then read the product information% t; F1 Y. t' d3 k' g. G# `
packet and concluded that it was most likely the rea-% ^, c* n5 \: e
son for the child’s virilization. At that time, they
% D. A6 o$ y( r L4 x! hdecided to put the baby in a separate bed, and the
. m% r: v5 X6 i* @' A; sfather was not hugging him with bare skin and had
5 b. C& W# g9 Tbeen using protective clothing. A repeat testosterone- t5 h4 P, q' w. l1 y
test was ordered, but the family did not go to the) \/ o# q$ S- J9 n: I+ h
laboratory to obtain the test.
0 }. m+ D) _! o! ?1 i ?Discussion
/ c8 d: _ e9 C- X/ a' P2 u1 \0 dPrecocious puberty in boys is defined as secondary! M7 \/ B9 ~1 |( l& b
sexual development before 9 years of age.1,49 Z# j( n- j E' R
Precocious puberty is termed as central (true) when
% \7 e9 O! A2 ]9 W; t" u' z$ {it is caused by the premature activation of hypo-
9 n% } u" s, Z `6 L( S9 {/ Jthalamic pituitary gonadal axis. CPP is more com-
* j3 W# |/ e$ [% r7 t( \5 f/ h$ Vmon in girls than in boys.1,3 Most boys with CPP F) |* U/ b. m! t9 f, Q; o
may have a central nervous system lesion that is
1 N' Z# U" O( `+ M0 ~responsible for the early activation of the hypothal-
5 ~) p6 m! V! f$ Gamic pituitary gonadal axis.1-3 Thus, greater empha-4 r2 u; @6 | o7 e7 G
sis has been given to neuroradiologic imaging in
- P% n! P' s- a8 g4 \: Pboys with precocious puberty. In addition to viril-
. q3 K* @0 ?* n0 m' l& i R! b" cization, the clinical hallmark of CPP is the symmet-
$ D* X* |, S6 v, |, R4 S6 n% u, Brical testicular growth secondary to stimulation by
+ q# k( Y1 E# L& o% ^gonadotropins.1,3" y& e" Z; f: N, g& g
Gonadotropin-independent peripheral preco-
( Y( A ~ s# I$ Ccious puberty in boys also results from inappropriate
6 b5 I3 u8 S4 D5 X5 Aandrogenic stimulation from either endogenous or9 D0 g& h" u. w9 b
exogenous sources, nonpituitary gonadotropin stim-
* n( X% e" a6 g& A$ [* nulation, and rare activating mutations.3 Virilizing6 R4 C! d6 u# O- ]8 e
congenital adrenal hyperplasia producing excessive, c5 P& }9 m2 b7 {- |+ J. W
adrenal androgens is a common cause of precocious
, k+ Z5 ^; }9 n! T. z Ypuberty in boys.3,4
8 ^9 k' E9 N! s" QThe most common form of congenital adrenal
9 t( ~3 E( }; m/ }- B5 z+ P6 lhyperplasia is the 21-hydroxylase enzyme deficiency.7 o; T! m3 H% l5 i# H' X( f8 A
The 11-β hydroxylase deficiency may also result in% J* c9 l3 [5 e% X! V* H; w
excessive adrenal androgen production, and rarely,
- L& A( n2 }% X2 m8 M8 Ian adrenal tumor may also cause adrenal androgen2 g& Q& A; ~5 v0 Z# H
excess.1,3 r% j) M. l! E6 C7 U+ J
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from) B6 A+ N5 K) w! K! ]. m
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
) \: K3 o, p" W3 u' d9 {# S" |A unique entity of male-limited gonadotropin-
6 `/ H p! E; C; O1 X: e1 windependent precocious puberty, which is also known& x1 ~: R/ x7 r R: ~
as testotoxicosis, may cause precocious puberty at a& ~$ X# s+ u8 a
very young age. The physical findings in these boys0 H {2 I' w. u4 P3 L
with this disorder are full pubertal development,% U& f+ d% J6 K& K2 r+ G
including bilateral testicular growth, similar to boys
/ Y. f' E8 U2 o( W- q' N8 r2 Bwith CPP. The gonadotropin levels in this disorder2 @+ m( t, D! k6 w: `
are suppressed to prepubertal levels and do not show7 ?4 ~1 b- T+ D
pubertal response of gonadotropin after gonadotropin-
# p1 z5 r9 ~) v) kreleasing hormone stimulation. This is a sex-linked& Q, E+ w0 l! D, v; V. {7 T
autosomal dominant disorder that affects only
$ ?7 j% R F6 g6 Emales; therefore, other male members of the family! H2 }. D+ x8 z/ v9 |
may have similar precocious puberty.35 a/ l# T, |' ?; @' e6 Y0 D' h5 q
In our patient, physical examination was incon-; g( k# y3 H5 l+ J# V
sistent with true precocious puberty since his testi-
3 E4 Q. }( [) w& B. G$ X! ~cles were prepubertal in size. However, testotoxicosis
, O/ T7 x: {1 l# g& |2 Pwas in the differential diagnosis because his father3 H* R6 Y& I, y! N+ W2 R1 I
started puberty somewhat early, and occasionally,2 W' ^/ E0 A9 ]6 e
testicular enlargement is not that evident in the+ Y/ Q! a% k6 A; S* G
beginning of this process.1 In the absence of a neg-; v; Q* n( z/ N
ative initial history of androgen exposure, our
4 f1 k9 `) s9 j9 N' H6 ]7 J6 Q- jbiggest concern was virilizing adrenal hyperplasia, L. k" s+ A- k- A
either 21-hydroxylase deficiency or 11-β hydroxylase5 H: n2 v! v6 I# t
deficiency. Those diagnoses were excluded by find-
2 f$ w% p5 i) l7 i0 M$ L0 B) \" e6 Q0 I( King the normal level of adrenal steroids.
& N0 i4 Z- ]$ QThe diagnosis of exogenous androgens was strongly
. g' l" w, L3 F' B8 d0 q5 wsuspected in a follow-up visit after 4 months because
0 k& N( L+ q4 U" L3 O* vthe physical examination revealed the complete disap-$ B7 u9 ~! _! W4 j) t" c
pearance of pubic hair, normal growth velocity, and
# q' a F7 ], U3 e% Y3 zdecreased erections. The father admitted using a testos-- x! C2 T& n6 |. Z9 }& f
terone gel, which he concealed at first visit. He was' U( G2 q m8 o5 M8 ?
using it rather frequently, twice a day. The Physicians’
1 N. `1 V1 `# ~& IDesk Reference, or package insert of this product, gel or
' n" k8 {- ?# C1 ~9 ?% l/ hcream, cautions about dermal testosterone transfer to
- o3 G5 v& Y# z" M. g' runprotected females through direct skin exposure.
: a9 E1 N: `/ p- _5 SSerum testosterone level was found to be 2 times the* \9 r- P& \# p/ P
baseline value in those females who were exposed to t. G" S$ a+ }% S' \: g
even 15 minutes of direct skin contact with their male7 w0 ~+ g/ G2 I6 F
partners.6 However, when a shirt covered the applica- a% m- V* K/ c
tion site, this testosterone transfer was prevented.
b6 f- K7 C' ]) BOur patient’s testosterone level was 60 ng/mL,
. l) L# h- S0 @& twhich was clearly high. Some studies suggest that5 ^; x4 C5 L1 y4 ?" \( D3 F
dermal conversion of testosterone to dihydrotestos-
/ Y' S' O& }3 s0 U" k) Aterone, which is a more potent metabolite, is more
; W( W8 P2 u3 D% d4 X( Eactive in young children exposed to testosterone) f5 W$ I7 B/ O( H) ^) W% h
exogenously7; however, we did not measure a dihy-
5 Q/ y: \- ~4 O- I' c4 adrotestosterone level in our patient. In addition to; C- j) h- M! _+ X# ~/ o8 v) j
virilization, exposure to exogenous testosterone in
* e( s/ e) J4 Q/ [& z; Echildren results in an increase in growth velocity and
& t; H5 W6 L4 n" C% h* T3 A: Tadvanced bone age, as seen in our patient.( |& p! ?0 b# {& p, }9 z9 a+ @
The long-term effect of androgen exposure during
4 f$ d+ r' ]6 z1 F. W$ F. c+ a! ?" Qearly childhood on pubertal development and final3 z5 E; P$ J/ U0 U8 d Q
adult height are not fully known and always remain: |. N6 ?* _+ p; w2 x/ l% h
a concern. Children treated with short-term testos-1 K% J% s9 Q" P) Z/ E
terone injection or topical androgen may exhibit some
- U" Y; ~% ^# `' t3 b/ n+ Tacceleration of the skeletal maturation; however, after, l3 D4 @& W+ D# o
cessation of treatment, the rate of bone maturation* @6 e' B+ g2 B% t
decelerates and gradually returns to normal.8,9
5 m+ l& M/ _& E9 g5 HThere are conflicting reports and controversy
- u! m0 W5 }$ J! G" Y, R8 fover the effect of early androgen exposure on adult: G1 L1 O9 ?& A
penile length.10,11 Some reports suggest subnormal
7 i7 P3 f! F) M' ^$ ~4 Nadult penile length, apparently because of downreg-% {5 T: m% Y/ i6 u* B) V1 d' }0 Y: o/ C: I
ulation of androgen receptor number.10,12 However,5 U5 N' l9 f! E) m& Q& ^
Sutherland et al13 did not find a correlation between
6 K% f: n% @1 ~2 r( J4 G1 ?childhood testosterone exposure and reduced adult
, ~0 D/ F4 B" U$ U5 L3 }+ npenile length in clinical studies.$ [3 q% J: h( W4 f
Nonetheless, we do not believe our patient is
5 T; o; ]( G) b0 L/ ?going to experience any of the untoward effects from
2 q% t0 m/ C1 @1 _' |# G- v# O& ftestosterone exposure as mentioned earlier because
8 Y) L# n+ K m4 t1 s ethe exposure was not for a prolonged period of time.. B, ~' }6 m1 i% g4 K
Although the bone age was advanced at the time of
! s8 x z- ^5 S# ydiagnosis, the child had a normal growth velocity at. i V0 M/ D: a0 W& v+ u
the follow-up visit. It is hoped that his final adult7 K2 \/ p F8 K. Y# P5 L3 C
height will not be affected.
* X+ R4 j N5 B( [4 r sAlthough rarely reported, the widespread avail- l( E5 u, t# q
ability of androgen products in our society may2 N/ Y- M p" m* Y: l1 m
indeed cause more virilization in male or female) e" z+ \, k* r. \$ c1 {
children than one would realize. Exposure to andro-
+ h# |3 k) ?# F9 d# ]gen products must be considered and specific ques-
2 d$ c7 N# u& [$ y* ~( wtioning about the use of a testosterone product or
, C! V' i9 @; I2 _gel should be asked of the family members during. L, y8 S* Y; x- B( b; V( B
the evaluation of any children who present with vir-
( n' U! ], T' j& \ilization or peripheral precocious puberty. The diag-
0 X, Q" P' X8 k; Q8 B- Ynosis can be established by just a few tests and by
( d7 N0 ~9 r$ ?1 V f0 e C: qappropriate history. The inability to obtain such a9 {; o3 `% p- ]: s2 C( M
history, or failure to ask the specific questions, may4 }; j& ]7 v) c) D8 A
result in extensive, unnecessary, and expensive
4 k0 Z" |1 Y o& \ x% E/ jinvestigation. The primary care physician should be5 n3 ]. F3 b' o2 E2 B$ Q
aware of this fact, because most of these children
! A& `; W1 U v Q7 ~may initially present in their practice. The Physicians’; i# l) e- d) [; l
Desk Reference and package insert should also put a
5 j9 U' H% W, n, ewarning about the virilizing effect on a male or
# P. s& j9 ^+ Efemale child who might come in contact with some-9 u9 n) m! n* C% h) z
one using any of these products.
# N/ d+ `. h1 A, OReferences$ ^5 L/ y2 Y' c$ n2 s" ^5 t+ d6 \
1. Styne DM. The testes: disorder of sexual differentiation9 n# v4 c+ W: w" P, h
and puberty in the male. In: Sperling MA, ed. Pediatric
* O$ d; H* V! R0 g6 M# E( @9 bEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;. Y4 [/ h! K, ~# ? y# Y, M
2002: 565-628.3 `9 R z7 e" K2 c: z; @! _) N
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
3 w6 _2 a+ d, Rpuberty in children with tumours of the suprasellar pineal6 m m; {4 x" c( W, q! D9 O( a
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* a! r, `5 s# l9 h3 uTopical Testosterone Exposure / Bhowmick et al 543
9 F: F1 b3 W! q* O5 lareas: organic central precocious puberty. Acta Paediatr.( f* h# w3 D; W5 L/ y
2001;90:751-756.1 K4 l& X. I' v2 G3 J" A
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
: y$ n/ J; Z8 s2 A. u2 @" I: I6 xPediatric Endocrinology. 4th ed. New York, NY: Marcel) v- [) ?; G, X
Dekker Inc; 2003:211-238.% Q$ Q0 M$ M7 ?1 g5 X
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual* \0 j$ B! y) j# m* Z' ~6 G
development in a two-year-old boy induced by topical
0 h8 }* w* k( S) J6 K8 I: Uexposure to testosterone. Pediatrics. 1999;104:e23.
1 w2 f; ]0 R5 ~3 S; X5. Greulich WW, Pyle SI, eds. Radiographic Atlas of5 F6 |1 F$ \, S8 L# r! X4 }" ]' n
Skeletal Development of the Hand and Wrist. 2nd ed." ^$ _: N/ y b
Stanford, CA: Stanford University Press; 1959.
' F! a# @& {2 o* h$ M. o6. Physicians’ Desk Reference. Androgel 1% testosterone,
" F' ? F% r/ F e- s! n: ~2 g* UUnimed Pharmaceutical Inc. Montvale, NJ: Medical% d8 c' C& _" ]7 d' C/ i
Economics Company, Inc; 2004:3239-3241.
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