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is a significant concern for physicians. Central
2 O* u2 |6 Q p5 O! j& M) [precocious puberty (CPP), which is mediated P5 i. \- ?$ z7 m4 E
through the hypothalamic pituitary gonadal axis, has. V- m* L, e4 Z$ f1 Y
a higher incidence of organic central nervous system: \, u" k' W: F! O" S1 j
lesions in boys.1,2 Virilization in boys, as manifested
. Y4 K+ t1 N+ M/ \8 K! hby enlargement of the penis, development of pubic4 K6 o! @2 q* l1 j' p
hair, and facial acne without enlargement of testi-$ J0 u; y/ m0 I9 L; o0 V2 ^
cles, suggests peripheral or pseudopuberty.1-3 We2 O* |( ~: H0 l& a: v. ^
report a 16-month-old boy who presented with the( Y! t6 D0 T* [, ^
enlargement of the phallus and pubic hair develop-% D; D, ], ]* o% {6 t8 R5 _0 n" K
ment without testicular enlargement, which was due! @7 J0 m. I" b, t/ ^
to the unintentional exposure to androgen gel used by, C6 |' b* V( O7 d! }+ i3 Q, ~
the father. The family initially concealed this infor-, B3 B F; H" _: \$ D" R
mation, resulting in an extensive work-up for this$ w$ u" n7 [6 q/ O* F/ Z
child. Given the widespread and easy availability of
- s8 x& Y" ~$ u0 Ntestosterone gel and cream, we believe this is proba-' f1 T# ]2 f+ [$ n5 T! r
bly more common than the rare case report in the
2 T3 p3 |% K) j+ l1 n$ tliterature.4
0 T e# b: R+ l6 Q% j+ @Patient Report
% G+ ]8 }1 g* M( JA 16-month-old white child was referred to the
$ T Z, ~2 _' H4 P6 \endocrine clinic by his pediatrician with the concern
& ?8 `8 r+ k. E$ Uof early sexual development. His mother noticed
3 F8 h& V5 s6 D& E R$ olight colored pubic hair development when he was
6 \1 O# N, @2 ?6 d7 ]From the 1Division of Pediatric Endocrinology, 2University of4 F @; [7 }( \- L, J
South Alabama Medical Center, Mobile, Alabama.
! P: q6 [( w0 g: WAddress correspondence to: Samar K. Bhowmick, MD, FACE,
) P* C/ C) X* d, X; S2 SProfessor of Pediatrics, University of South Alabama, College of
; u& O0 @4 C0 A. F" r0 @3 P wMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;! t" g' Q y# _. E( d- L( |
e-mail: [email protected].8 z3 N6 s% r/ H$ z2 L0 H
about 6 to 7 months old, which progressively became
4 p/ @/ y# M$ g' }* k$ f( ~; L6 Xdarker. She was also concerned about the enlarge-
* \4 f. _+ U; m$ J- F1 ^3 oment of his penis and frequent erections. The child
% @! Q7 m/ k4 q1 e- K/ [was the product of a full-term normal delivery, with4 r! E7 A$ h9 R4 K- x; d
a birth weight of 7 lb 14 oz, and birth length of
8 [9 y8 j2 H7 ]* i2 o" h& u* P+ s9 ]20 inches. He was breast-fed throughout the first year4 s. p+ {8 Y. z4 R* l" x( l8 T1 @
of life and was still receiving breast milk along with2 o& L% k' J5 _& U
solid food. He had no hospitalizations or surgery,
7 B2 ^9 y, K+ z7 }: Land his psychosocial and psychomotor development
& c- j. e8 l4 C4 R6 \- O) \was age appropriate.
8 i8 g* j1 p% MThe family history was remarkable for the father,
4 c/ c! G$ m, n, W o6 P3 Lwho was diagnosed with hypothyroidism at age 16,& v5 t. ~+ u* H) \
which was treated with thyroxine. The father’s+ ^4 `2 Y4 u8 |' ?: R
height was 6 feet, and he went through a somewhat
! V- f6 L* [$ H( |; M, y, U- e4 oearly puberty and had stopped growing by age 14.
: L* _6 y6 P" A$ F, ^) BThe father denied taking any other medication. The
8 V+ `7 I% }1 echild’s mother was in good health. Her menarche
7 A( K- G6 B* H% Mwas at 11 years of age, and her height was at 5 feet5 d$ p; ?, Z& d
5 inches. There was no other family history of pre-
, S8 G3 ?9 n7 H, y ]: ]: Dcocious sexual development in the first-degree rela-
* x# `, l/ G5 ytives. There were no siblings.0 w }/ w# W( C$ [
Physical Examination
7 u3 |( E1 y6 j# G6 VThe physical examination revealed a very active,
9 }2 t3 x* |0 N5 bplayful, and healthy boy. The vital signs documented
) |& u9 A }* N7 s4 \a blood pressure of 85/50 mm Hg, his length was
( V* S1 ?4 |8 B8 ~- p, a5 {" O90 cm (>97th percentile), and his weight was 14.4 kg
$ B* q* G- [$ M, v(also >97th percentile). The observed yearly growth
7 G" f8 t% F" }+ R( N* @& q; hvelocity was 30 cm (12 inches). The examination of8 `# F2 h8 ]$ F" L7 ^
the neck revealed no thyroid enlargement.$ J$ w8 U5 R) x, ]$ g
The genitourinary examination was remarkable for2 `$ o# F% V, G$ w. W8 R
enlargement of the penis, with a stretched length of$ K. ~" t6 E7 L9 k* I
8 cm and a width of 2 cm. The glans penis was very well6 o# T& {9 q! i. C0 I
developed. The pubic hair was Tanner II, mostly around. d4 `# q6 f. K# ?
540
( N% y7 w D1 ?( ^6 pat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
3 ~ P$ u# ~( L! ^the base of the phallus and was dark and curled. The
; r) z3 \, E1 _6 |: F" W8 E" H _testicular volume was prepubertal at 2 mL each.9 V1 ?2 Q2 v& m) g: p
The skin was moist and smooth and somewhat
2 l } h- P. n: Boily. No axillary hair was noted. There were no5 H5 F/ v1 L' P4 r: p
abnormal skin pigmentations or café-au-lait spots.9 x6 G, _9 H) a- |
Neurologic evaluation showed deep tendon reflex 2+3 @3 p6 r: j, p/ p g
bilateral and symmetrical. There was no suggestion1 I5 K" H& E. I. n* Q8 G' V: V
of papilledema. ]; }( |% F% A4 a. P
Laboratory Evaluation
6 B! j7 m: I2 ^ w4 pThe bone age was consistent with 28 months by
8 P, f4 o9 v3 |' K' D& x& {) ousing the standard of Greulich and Pyle at a chrono-
* w3 x8 @' `6 O6 \' u* B1 flogic age of 16 months (advanced).5 Chromosomal
/ K- W% ?7 H1 p" N# C' ykaryotype was 46XY. The thyroid function test M' [) x, ^# _, L
showed a free T4 of 1.69 ng/dL, and thyroid stimu-. A# Q2 H& _/ P7 @, m
lating hormone level was 1.3 µIU/mL (both normal).8 y8 C0 e- u# H* L8 z8 Q0 A
The concentrations of serum electrolytes, blood
% X5 ?* ~/ @- P3 c" V$ nurea nitrogen, creatinine, and calcium all were
5 [% d7 w5 p9 @( ?( v& o% S. `- d1 C" Bwithin normal range for his age. The concentration- ]; I/ ]7 O0 k$ Y4 }8 h
of serum 17-hydroxyprogesterone was 16 ng/dL
: ?2 Q4 V3 J. l(normal, 3 to 90 ng/dL), androstenedione was 205 h( O+ [/ ~- [, W, l4 Y
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
& n$ ?* Y+ N; w% ^terone was 38 ng/dL (normal, 50 to 760 ng/dL),
9 p1 v, a, [8 A; idesoxycorticosterone was 4.3 ng/dL (normal, 7 to1 U+ @3 d6 K& v5 W- l
49ng/dL), 11-desoxycortisol (specific compound S)
* c) G" ?3 h9 V- v& ?3 mwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-1 a$ M; d3 U x' B; K+ d
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total( G, V, z1 X# h: X
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),/ b$ _" ^/ Y3 `2 |2 _7 ~* ^
and β-human chorionic gonadotropin was less than
) K- k2 E" }0 _% P6 c6 h5 mIU/mL (normal <5 mIU/mL). Serum follicular6 Y% L1 B6 q" V Q
stimulating hormone and leuteinizing hormone) ?5 D0 M* ~. v* _% i
concentrations were less than 0.05 mIU/mL
* a7 |4 v5 z! i+ S+ ^(prepubertal)." Y8 {! ^( ?' C9 b/ |3 [; f9 I
The parents were notified about the laboratory2 E6 c0 p# } \8 t! }
results and were informed that all of the tests were
* w# ?- I3 N6 i H+ g4 @# Xnormal except the testosterone level was high. The
+ F% _& J1 n5 t9 X/ tfollow-up visit was arranged within a few weeks to
- Q- b8 y9 p1 `4 N; R" vobtain testicular and abdominal sonograms; how-. ?- n: n$ N$ p1 F# b0 \
ever, the family did not return for 4 months.
' a* z% ?# S6 F7 m- J2 w, u( |/ vPhysical examination at this time revealed that the
; L& z( d3 @, u1 l0 F3 Tchild had grown 2.5 cm in 4 months and had gained! V2 [8 C, V/ w, p
2 kg of weight. Physical examination remained
/ ~6 ^8 c0 P; Kunchanged. Surprisingly, the pubic hair almost com-; d: E# p; G, W
pletely disappeared except for a few vellous hairs at7 E: ?' q4 Z, J, ]* T3 C
the base of the phallus. Testicular volume was still 28 u0 j9 R0 B$ x# N6 Y$ p7 Q
mL, and the size of the penis remained unchanged.! N+ s/ x) _: ~0 z0 A5 ~+ L v
The mother also said that the boy was no longer hav-
' V E6 i$ m/ m2 e* k- z @6 @ing frequent erections.% S4 f# h0 F% x6 C1 g+ S3 {0 M
Both parents were again questioned about use of
# Y1 v/ C9 ~5 Z) w. u- @any ointment/creams that they may have applied to+ l% l6 W7 ?$ T5 ?
the child’s skin. This time the father admitted the
! J; h: u1 {5 Z5 o: aTopical Testosterone Exposure / Bhowmick et al 541
9 G3 ]/ L. R7 } u0 C1 Huse of testosterone gel twice daily that he was apply-/ u& G+ _$ {2 G1 |. I! a1 F
ing over his own shoulders, chest, and back area for
2 D9 U9 t$ y( H5 f$ Ma year. The father also revealed he was embarrassed
+ p1 K8 ]8 l/ U: gto disclose that he was using a testosterone gel pre-. g3 g. Q4 Y# {9 n' Y: X
scribed by his family physician for decreased libido8 E6 b/ I) D' J; {/ E' f
secondary to depression., N7 q% _2 @- G* U8 }2 r& N( O" x
The child slept in the same bed with parents.
" [4 I, p$ ^+ h1 T* g. BThe father would hug the baby and hold him on his6 [2 Z% L. f4 j0 F
chest for a considerable period of time, causing sig-% ?/ {' y: }$ D* v
nificant bare skin contact between baby and father.! {& t, \: \1 X
The father also admitted that after the phone call,
5 i" ]7 Q. Q- z+ Pwhen he learned the testosterone level in the baby! `4 q& E. r& v- G2 P
was high, he then read the product information
8 v* P0 J t' G E y. Lpacket and concluded that it was most likely the rea-
; u/ z5 B' u/ _) a: Wson for the child’s virilization. At that time, they( N" e+ ?' ~: X$ ~" I, c2 e- S
decided to put the baby in a separate bed, and the
. h, o3 E+ H9 x+ Gfather was not hugging him with bare skin and had
! I) H) v7 o- {; ^" _) M$ \been using protective clothing. A repeat testosterone/ r) k" O9 e( h/ ^5 B
test was ordered, but the family did not go to the% N) a& ~: t0 W" O8 c/ U4 _2 q( Y
laboratory to obtain the test.- o. k* }/ ~3 W6 q8 S1 |2 s) ^
Discussion$ L7 r) k! a8 H9 |+ ?
Precocious puberty in boys is defined as secondary
8 B" s: t v, c; z) o6 N/ @sexual development before 9 years of age.1,45 w, _9 `! c! L' {
Precocious puberty is termed as central (true) when
& p. _5 {; e# E( t; A" sit is caused by the premature activation of hypo-0 X% O- U) s0 u, k% A! x
thalamic pituitary gonadal axis. CPP is more com-/ @4 b9 L" n# s
mon in girls than in boys.1,3 Most boys with CPP6 [. `# I9 m+ _7 e# r
may have a central nervous system lesion that is
3 P A6 N/ u9 |& o) ^: v6 }# Eresponsible for the early activation of the hypothal-3 I6 T$ F1 P2 C* C0 i
amic pituitary gonadal axis.1-3 Thus, greater empha-6 a: A. d- X5 `- g* o* ^
sis has been given to neuroradiologic imaging in
+ K2 |3 O# Q5 m, M+ E3 D- E) e6 y1 qboys with precocious puberty. In addition to viril-
4 j* Y' S0 n, S7 R, w8 @ization, the clinical hallmark of CPP is the symmet-# _5 I: q" l, ~$ I& m4 h3 U
rical testicular growth secondary to stimulation by
2 ]& j6 H, k% G+ v0 B& Pgonadotropins.1,3" d. N' R2 m" j: b8 K W4 q
Gonadotropin-independent peripheral preco-
) m* ~+ V; L) D, Vcious puberty in boys also results from inappropriate* c `& f3 j& _% v0 }; u
androgenic stimulation from either endogenous or! d' U. U4 }3 l. r. _. m
exogenous sources, nonpituitary gonadotropin stim-
% s+ K# k8 z5 |7 \- [: Qulation, and rare activating mutations.3 Virilizing( a2 z0 ]+ Z) _5 X
congenital adrenal hyperplasia producing excessive
( ?9 n3 X- c* ]+ s& \adrenal androgens is a common cause of precocious
7 C7 M. z" o5 f3 \puberty in boys.3,4
$ W1 b" \& o5 q) RThe most common form of congenital adrenal' p1 x1 W7 l! R. T) ?: T
hyperplasia is the 21-hydroxylase enzyme deficiency.- Y5 l" h% t, ^" X9 \
The 11-β hydroxylase deficiency may also result in
2 U. V) f" R) Q" n# a0 [2 ]7 {excessive adrenal androgen production, and rarely,; L9 J, ^9 ^0 i3 ?. y1 p8 G
an adrenal tumor may also cause adrenal androgen, s0 U ?# W1 D- D. b' ~
excess.1,3
! X6 }- g3 s: j6 V# b: p/ Z/ C1 fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
) N( ?. h X$ g0 N7 M4 J542 Clinical Pediatrics / Vol. 46, No. 6, July 2007. K: q3 W* {4 w2 Q9 l9 i8 K7 n# m: k
A unique entity of male-limited gonadotropin-% k, a& e& f( l, l5 S g
independent precocious puberty, which is also known
" K* r6 [% n) H- o# mas testotoxicosis, may cause precocious puberty at a
! Z. B- }1 q! A/ i }+ D8 D3 Fvery young age. The physical findings in these boys
2 u' N/ M: A+ I( w1 ?with this disorder are full pubertal development,; y( w% |+ \& I( P' }% G+ G" x B
including bilateral testicular growth, similar to boys
# h+ _" H+ M4 C1 I' T, Ywith CPP. The gonadotropin levels in this disorder! w1 v) k' h! R! a8 K$ g
are suppressed to prepubertal levels and do not show5 w( Z+ L( }4 p0 E" B' a
pubertal response of gonadotropin after gonadotropin-/ e: |8 J& _+ q% R
releasing hormone stimulation. This is a sex-linked! ~1 {; ]3 N4 ^; z" [
autosomal dominant disorder that affects only1 ~) P4 k. t, |
males; therefore, other male members of the family' U8 ] h+ \1 Y' G# ~8 z
may have similar precocious puberty.3; a' z4 C* V# Q5 V
In our patient, physical examination was incon-
6 G* p: V9 ]' o4 w* R8 p: W# K; usistent with true precocious puberty since his testi-& P$ [: B' v: M; v% L$ v Z r+ h* J0 f
cles were prepubertal in size. However, testotoxicosis. z. o; E+ n6 F6 [: q
was in the differential diagnosis because his father# V Z5 i m b% u1 j0 u
started puberty somewhat early, and occasionally,2 B1 ?* L* f0 G0 s/ M7 F8 o4 i' f
testicular enlargement is not that evident in the# O. B/ J4 u: V5 b$ X# A
beginning of this process.1 In the absence of a neg-
+ R# B8 I' Q: ~3 d Fative initial history of androgen exposure, our
, i0 {3 s, W; z& T8 }3 Ubiggest concern was virilizing adrenal hyperplasia,; E( [4 N! U* m' l: z- l
either 21-hydroxylase deficiency or 11-β hydroxylase$ U5 i% V/ U: T/ S- A* f- F, S
deficiency. Those diagnoses were excluded by find-6 @9 ^3 T7 ^# ?9 C' p; H
ing the normal level of adrenal steroids.
. h. ?& N3 j7 S& F sThe diagnosis of exogenous androgens was strongly6 Q2 \' R& ?$ ?6 c- s
suspected in a follow-up visit after 4 months because
: r6 |6 h4 Y# o0 T& fthe physical examination revealed the complete disap-
5 m! x- {2 _9 |7 N0 Ppearance of pubic hair, normal growth velocity, and
, [) f- H0 Y; g1 u' c8 b. @decreased erections. The father admitted using a testos-. J/ i4 C& Y# v8 Y" q( ~/ d
terone gel, which he concealed at first visit. He was
' Q) l3 R# r2 {! \$ i& H) G. susing it rather frequently, twice a day. The Physicians’0 N9 \' _1 b: v- H& ?" e% Q
Desk Reference, or package insert of this product, gel or1 o! Y, r+ {% G- |
cream, cautions about dermal testosterone transfer to H. m7 h7 M m+ L4 ~" |$ ~
unprotected females through direct skin exposure.+ F2 u' y. l' R& z8 H- b
Serum testosterone level was found to be 2 times the4 w( \! U [" U; A5 B3 `5 [$ u9 Z0 R4 a& T
baseline value in those females who were exposed to
% |& p' C( D; b8 q7 {. P* l; eeven 15 minutes of direct skin contact with their male
8 Z" E( e* R+ Q+ v1 jpartners.6 However, when a shirt covered the applica-) S' W) C& l* ]3 X+ b L5 {; d
tion site, this testosterone transfer was prevented.
' l: }8 T9 q$ K' O; V7 IOur patient’s testosterone level was 60 ng/mL,
A4 h2 o+ ~( l. u7 `- t' Lwhich was clearly high. Some studies suggest that
G# g' r n: a/ S# H( Gdermal conversion of testosterone to dihydrotestos-+ ~! g6 E; Y9 i E6 ^ d
terone, which is a more potent metabolite, is more
P; `1 T3 J4 T2 ~4 Dactive in young children exposed to testosterone
8 I$ q5 }" V, T1 W, @" fexogenously7; however, we did not measure a dihy-0 h( e4 H4 a9 K E, L) `
drotestosterone level in our patient. In addition to5 t% V$ M2 H. m5 U5 R1 o& L/ e5 P9 v
virilization, exposure to exogenous testosterone in
* f# o. I& F# w- e# S1 i- |children results in an increase in growth velocity and
5 k1 Y! `6 w5 K0 C) Uadvanced bone age, as seen in our patient.
- r3 s- S# \0 Y! j$ T( |The long-term effect of androgen exposure during
3 V. Y" F, W: |% L4 B+ qearly childhood on pubertal development and final
$ J6 V* W: F+ H, g6 X! |+ dadult height are not fully known and always remain
" M D" _' [* M. p$ v: pa concern. Children treated with short-term testos-( m& \2 d) |- `1 l
terone injection or topical androgen may exhibit some
5 u9 D* [, y4 K _3 \acceleration of the skeletal maturation; however, after2 w. [- A( U: ~5 w! p7 V4 {- g
cessation of treatment, the rate of bone maturation" ~, M* V$ M) H/ f, G* A% E
decelerates and gradually returns to normal.8,99 T* G' h5 z( R; T# m# e$ \& W/ K; N
There are conflicting reports and controversy
" s6 v+ h% v2 w+ Z$ a0 Y; Nover the effect of early androgen exposure on adult
& D) N4 E# A) Z. P# m' X4 Y/ g- Tpenile length.10,11 Some reports suggest subnormal- A5 @. A" E. k/ c9 A5 z; A9 ~
adult penile length, apparently because of downreg-+ x; \5 k3 f* u2 P, s2 [
ulation of androgen receptor number.10,12 However,
( ^3 n M2 I% ~$ C/ e4 fSutherland et al13 did not find a correlation between/ ]5 C. T; r. l4 H6 N
childhood testosterone exposure and reduced adult
3 v5 ^' G9 s; s) J' ]& o! b$ g: jpenile length in clinical studies.( R' ]/ ?6 i. |& h: k; B
Nonetheless, we do not believe our patient is; z( L/ c# E8 o; Q* }
going to experience any of the untoward effects from1 n7 ~/ l7 V3 X% R
testosterone exposure as mentioned earlier because
: B$ B, K- S1 u' k8 p8 R; V7 F kthe exposure was not for a prolonged period of time.
3 C8 T+ o3 u9 q J# IAlthough the bone age was advanced at the time of9 L5 H/ i" S& e% x5 {
diagnosis, the child had a normal growth velocity at
! W3 E3 E! F4 e. O8 L6 uthe follow-up visit. It is hoped that his final adult: _# L2 D0 G1 k5 C
height will not be affected.
4 k* [: f: h H( i2 `Although rarely reported, the widespread avail-0 K, R i% q; {; q
ability of androgen products in our society may q2 S6 X4 L4 W. t
indeed cause more virilization in male or female8 K) O8 G; m5 O+ Y( j' r
children than one would realize. Exposure to andro-
' |3 l$ n9 H8 U) p4 k. R1 Agen products must be considered and specific ques-! F' J, h4 d, x& [# W* e
tioning about the use of a testosterone product or/ @( y) v0 h5 l. L5 w
gel should be asked of the family members during( s0 P2 ?) n6 P' C' l& d
the evaluation of any children who present with vir-
9 u+ U! H0 @1 R! l& silization or peripheral precocious puberty. The diag-
' }4 t" `# @3 \5 r7 snosis can be established by just a few tests and by
6 v* h7 `9 t8 K) m( d" _appropriate history. The inability to obtain such a3 L0 b5 x( T* u, Z5 @$ k. ^1 t' f @" m
history, or failure to ask the specific questions, may& ]1 V$ |2 O0 W0 e4 J- j% A3 m
result in extensive, unnecessary, and expensive
, P: R2 ~2 Q1 U+ winvestigation. The primary care physician should be1 U! N( i( e; c% p8 P
aware of this fact, because most of these children
' f& A0 n" f- ?, [& E1 ^3 gmay initially present in their practice. The Physicians’
' [+ S: O3 q6 q0 ^1 f* }6 b1 Y! UDesk Reference and package insert should also put a2 ]# X) b- X7 o& ^/ t8 l
warning about the virilizing effect on a male or
, O; ~" r/ l9 @' V- q- \female child who might come in contact with some-' I. d5 v9 @3 G5 m
one using any of these products.9 n' U8 @; d: U0 G5 Z# T
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! c6 D' n' O7 Q! G5 b, p2 SEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
7 v0 g- }1 r* R/ o* F, S9 H/ j2002: 565-628.
" y% v# P) h" i4 E. J r( K: n2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
) F+ ? V& s, @+ |0 e9 _0 Upuberty in children with tumours of the suprasellar pineal& y1 ~2 x ] k/ x" @
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Pediatric Endocrinology. 4th ed. New York, NY: Marcel
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4 S, E% A N1 U4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual! [; m0 v& c& i+ [* v
development in a two-year-old boy induced by topical0 o2 }& i8 L J, |6 c7 [5 z
exposure to testosterone. Pediatrics. 1999;104:e23.& F7 O' j( U/ C) A
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
' _& n2 o- O" m- J, Q) ISkeletal Development of the Hand and Wrist. 2nd ed.
' Z4 `4 {) r' G1 S* m+ UStanford, CA: Stanford University Press; 1959.8 d7 W1 V3 m1 ?& x+ \' p4 F; \
6. Physicians’ Desk Reference. Androgel 1% testosterone,: ^3 }+ O t7 t- x
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
9 i& Q: _1 l4 Q. G9 @$ NEconomics Company, Inc; 2004:3239-3241.
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