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is a significant concern for physicians. Central% }( \( V, v9 U' @2 v) j% u7 z
precocious puberty (CPP), which is mediated
" `) P v/ A$ P% Pthrough the hypothalamic pituitary gonadal axis, has
* J6 R4 f) d7 x1 sa higher incidence of organic central nervous system4 Z" K9 [$ L5 M: n
lesions in boys.1,2 Virilization in boys, as manifested7 g, ]8 o' _+ A$ I6 L+ ^4 o
by enlargement of the penis, development of pubic) R- l3 x- K$ x. k/ D
hair, and facial acne without enlargement of testi-; a; z9 P/ C* j: v( u
cles, suggests peripheral or pseudopuberty.1-3 We
5 N& }: M( j8 c; preport a 16-month-old boy who presented with the; D, X( l4 b) [2 W% H
enlargement of the phallus and pubic hair develop-9 N) E9 J+ o! x# F% K7 _) i
ment without testicular enlargement, which was due; q$ F' E ^* B6 L9 `* H
to the unintentional exposure to androgen gel used by
* P5 X% J' j5 W/ Bthe father. The family initially concealed this infor-
) d+ Y m0 P7 _7 X2 d) e' P7 Qmation, resulting in an extensive work-up for this
8 m1 Y' X8 i: a' Bchild. Given the widespread and easy availability of
; W) j: a2 V8 @/ [testosterone gel and cream, we believe this is proba-' }; t) N5 d# y8 `2 i6 g4 ^7 }( D
bly more common than the rare case report in the
* J( F* I6 q9 vliterature.4/ E( ]8 W; P, z+ L: K* Z! b
Patient Report7 S; I6 x( w# n% v: `
A 16-month-old white child was referred to the4 h) \: ?7 Z4 R; Z
endocrine clinic by his pediatrician with the concern
1 \0 O$ q b4 C" d2 xof early sexual development. His mother noticed, C2 q/ R& W- ^2 M+ U4 H
light colored pubic hair development when he was
* T; N! @- |1 o* Q5 e/ T) t$ GFrom the 1Division of Pediatric Endocrinology, 2University of. a+ m5 z4 I7 T+ T/ w3 T: S- Z$ |0 o
South Alabama Medical Center, Mobile, Alabama.
# Z& o( N7 Z b) ^9 `8 @, b& qAddress correspondence to: Samar K. Bhowmick, MD, FACE,
' E/ J. ]$ B% X' sProfessor of Pediatrics, University of South Alabama, College of
5 i1 P8 U7 G- a* o2 n* k9 }. rMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
* J! n. m5 c- d8 f( Ge-mail: [email protected].+ e& x& A% ?- |
about 6 to 7 months old, which progressively became0 C2 i& Y6 P; S' Z' n( I3 ~
darker. She was also concerned about the enlarge-4 I0 r0 J' S S# j
ment of his penis and frequent erections. The child. {9 H; h# i( t/ c. F
was the product of a full-term normal delivery, with
$ X3 }" N. T9 @* \8 b2 j6 Pa birth weight of 7 lb 14 oz, and birth length of
1 g$ n8 ?' P& N* ~5 U20 inches. He was breast-fed throughout the first year: {! x8 p8 J$ S: ]) w( ~
of life and was still receiving breast milk along with/ k0 U; b9 c3 ?- A+ x- @! G, w
solid food. He had no hospitalizations or surgery,
: v* n" }1 n$ N/ O, _9 Pand his psychosocial and psychomotor development1 n% ^8 l2 H- W' ~, Y
was age appropriate.
7 C9 d) A) H1 E7 A$ BThe family history was remarkable for the father, H4 }0 V: Q( f* r L$ m
who was diagnosed with hypothyroidism at age 16,
& _* j6 C, B) Y1 |0 Q2 Z( dwhich was treated with thyroxine. The father’s# v- C+ [6 Z# o& L9 Q
height was 6 feet, and he went through a somewhat
}2 s. Q0 ^- c% f8 H. hearly puberty and had stopped growing by age 14.
. W4 v3 `. ?' j% G" h% X cThe father denied taking any other medication. The
- A; z4 ?; `: ^& C% {child’s mother was in good health. Her menarche
" r( k5 q d' W2 _was at 11 years of age, and her height was at 5 feet
* x1 ~1 ~) L4 j3 r0 Q5 inches. There was no other family history of pre-" U! {: o' d/ `0 |* i
cocious sexual development in the first-degree rela-3 d* W, k5 y( u
tives. There were no siblings.0 H2 H0 O4 @6 t/ \8 b/ }" K, W
Physical Examination) E4 a" @9 \7 T4 ^6 j
The physical examination revealed a very active,9 f; Q3 C x8 `7 u) `' J6 n
playful, and healthy boy. The vital signs documented
5 y, Y, w) s! Pa blood pressure of 85/50 mm Hg, his length was; k/ A; c9 v O# g' ], d$ R1 B
90 cm (>97th percentile), and his weight was 14.4 kg
( C' n6 X/ z# ]' g% X8 @(also >97th percentile). The observed yearly growth
9 G) |' u. R( }# U; [8 nvelocity was 30 cm (12 inches). The examination of
+ i+ p1 Y, } q* _* b3 ?6 X0 ?the neck revealed no thyroid enlargement.8 ~, h% o7 _3 {2 k1 n/ }# b) N
The genitourinary examination was remarkable for
' L( u4 f0 H$ M3 E& K( k5 @+ h) ^enlargement of the penis, with a stretched length of
T. w. t1 l( c9 T0 K7 |8 cm and a width of 2 cm. The glans penis was very well
5 L/ A: T& }) P0 [5 W5 s* Qdeveloped. The pubic hair was Tanner II, mostly around1 E7 g) o0 Z$ s% K' x7 Y
540
8 W! ]; ?% g8 Z0 N& u# d' cat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
3 n+ J- H* h0 h. q; Uthe base of the phallus and was dark and curled. The
; e/ l9 u8 p) N Ktesticular volume was prepubertal at 2 mL each.7 z6 @- B* ~" t
The skin was moist and smooth and somewhat
9 l" \+ h, J) z/ |0 H# q& I, Roily. No axillary hair was noted. There were no
$ U; C" c+ m0 k; w! h6 T- C" p! Babnormal skin pigmentations or café-au-lait spots.6 c0 A8 G6 m! J( N* ~
Neurologic evaluation showed deep tendon reflex 2+ x9 Q! ?/ c2 p6 P2 v$ ]$ D
bilateral and symmetrical. There was no suggestion/ f1 m; {; n) _! d% @
of papilledema.. K3 \+ }0 @" T. p/ W8 v
Laboratory Evaluation
7 G' o3 d* ~! q8 Y* p n0 AThe bone age was consistent with 28 months by% A( O! q: t2 i3 b
using the standard of Greulich and Pyle at a chrono-- ^- S% S/ Y9 B# s7 J* s2 W
logic age of 16 months (advanced).5 Chromosomal: A$ V3 @8 j( l( b u
karyotype was 46XY. The thyroid function test' R* D5 C# R% f' }
showed a free T4 of 1.69 ng/dL, and thyroid stimu-3 W8 y; f1 r. c7 K6 d
lating hormone level was 1.3 µIU/mL (both normal).
' m0 q, A1 T4 r9 IThe concentrations of serum electrolytes, blood( [! v8 f4 |' ~7 H- }! J/ l
urea nitrogen, creatinine, and calcium all were( R A, q* |7 H% {+ e5 y* e( }
within normal range for his age. The concentration
. d8 k8 L7 Q: ~! o" d/ X, `5 Tof serum 17-hydroxyprogesterone was 16 ng/dL* e4 V& C8 Y- O$ ]5 k6 B
(normal, 3 to 90 ng/dL), androstenedione was 204 S6 I3 H0 |, m( V
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
7 Q% z7 F+ U9 d9 Wterone was 38 ng/dL (normal, 50 to 760 ng/dL),- Q5 ~) P( f0 O
desoxycorticosterone was 4.3 ng/dL (normal, 7 to0 L1 E6 B4 {3 P/ F/ S0 y% J
49ng/dL), 11-desoxycortisol (specific compound S)
. f9 u$ T, W; }/ t, ~! |was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-6 Q6 V T: X4 s/ R
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
6 c5 Y+ e! b1 F) s: } Dtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),* G2 i' f0 w& B- i: \1 |1 O
and β-human chorionic gonadotropin was less than
3 O# m! k2 \) H4 y: b+ d9 H5 mIU/mL (normal <5 mIU/mL). Serum follicular$ H+ c2 M$ Z# R9 `- c2 X
stimulating hormone and leuteinizing hormone
) X }& D! @# g8 [$ ]5 t7 w" wconcentrations were less than 0.05 mIU/mL4 l" O; U8 U* I+ X, V
(prepubertal).+ A* k$ K( `4 |% w; Z" _( x/ W5 c
The parents were notified about the laboratory, }/ t5 M- H. U1 ~5 a
results and were informed that all of the tests were
9 L, l( M4 L0 A8 s! A- T6 s& knormal except the testosterone level was high. The& U) c1 ?4 v5 L' \% H2 P3 H4 Z
follow-up visit was arranged within a few weeks to% C. W! D) b1 }
obtain testicular and abdominal sonograms; how-7 b/ q) b1 V4 R* R% e. N6 U$ w
ever, the family did not return for 4 months.
% ]# j; e1 y( SPhysical examination at this time revealed that the
8 d3 R4 m3 h; @/ Z) Dchild had grown 2.5 cm in 4 months and had gained
0 s) s) i6 m% T( x5 i2 kg of weight. Physical examination remained
' Q/ K' g8 P7 F' U h6 [; _unchanged. Surprisingly, the pubic hair almost com-+ k8 q! n0 F; q" b1 Q# {4 v
pletely disappeared except for a few vellous hairs at
, Z/ y7 f; ~" h, a# ythe base of the phallus. Testicular volume was still 2" m( K6 n; @9 W8 X! Z9 T" r
mL, and the size of the penis remained unchanged.9 R* i, \9 b) b4 h& G7 V
The mother also said that the boy was no longer hav-
5 s2 S, _6 ` h" r: g$ c% sing frequent erections.$ G9 B8 p* H, C
Both parents were again questioned about use of
# c, M. V4 M" l1 h/ P: v( nany ointment/creams that they may have applied to
$ c& k* G; D0 |! o% Kthe child’s skin. This time the father admitted the' A' x! y) m& h. |- G
Topical Testosterone Exposure / Bhowmick et al 5418 l3 z4 Y5 a1 i) o
use of testosterone gel twice daily that he was apply-9 r; G1 _( L+ ~( u
ing over his own shoulders, chest, and back area for
3 G/ Y& `1 F% q4 g" n( Ga year. The father also revealed he was embarrassed' m ]5 a4 W: Y8 s$ S0 {
to disclose that he was using a testosterone gel pre-+ c5 u, }; ]# j# e0 o4 |, B
scribed by his family physician for decreased libido
4 | B$ D! c1 |. n( r; [secondary to depression.* C7 m9 o" A3 ^6 u/ v# M5 ~2 |) O' D
The child slept in the same bed with parents.
3 L: i$ p* d% iThe father would hug the baby and hold him on his+ K4 l% x+ J% p" v9 i }; L
chest for a considerable period of time, causing sig-) Q: G7 [- B8 f* K
nificant bare skin contact between baby and father.
" N, V1 I7 P0 @' b+ z2 o' X& RThe father also admitted that after the phone call,! j2 j9 i, a2 x8 C6 n ?
when he learned the testosterone level in the baby' X: J& y8 G( o, [; @% x
was high, he then read the product information
( r$ I) E3 w3 w: ~/ Ipacket and concluded that it was most likely the rea-
4 M! H: g( s5 g6 m# h7 lson for the child’s virilization. At that time, they
} @7 y' D. i7 t0 u4 ^" pdecided to put the baby in a separate bed, and the
1 u& j b$ y" W5 g+ zfather was not hugging him with bare skin and had! J$ C2 V& @4 ~
been using protective clothing. A repeat testosterone) [6 d% U9 H# y; N6 A
test was ordered, but the family did not go to the6 r! C0 h8 g$ Z/ k8 r) A: i6 X+ M
laboratory to obtain the test.
$ N& Y. g$ i( U7 Q: L; ?Discussion
9 X( f# X$ s7 {" h. y; tPrecocious puberty in boys is defined as secondary+ o8 z& R# \: e
sexual development before 9 years of age.1,4$ l7 ]! ~0 a) h" U! Y8 N* O9 j* }7 f
Precocious puberty is termed as central (true) when
8 x& g: y9 J5 o8 O& vit is caused by the premature activation of hypo-) F* n; n$ @4 K
thalamic pituitary gonadal axis. CPP is more com-! ]% q8 H; |5 y* ]; W' y
mon in girls than in boys.1,3 Most boys with CPP
# S, E8 b2 H" e, hmay have a central nervous system lesion that is% O& m7 s9 j$ i& p5 I
responsible for the early activation of the hypothal-
* s, K# W+ \+ x2 v# h4 pamic pituitary gonadal axis.1-3 Thus, greater empha-
3 h, Z6 U7 t4 @7 w& k3 Osis has been given to neuroradiologic imaging in* _! P1 ~; \3 c+ Y |% ?$ B0 T
boys with precocious puberty. In addition to viril-% h9 y9 d, \- ?" F
ization, the clinical hallmark of CPP is the symmet-
y+ I- {7 h' X2 _/ c; Srical testicular growth secondary to stimulation by4 o7 X0 Z, v6 U( s/ F1 R! g E
gonadotropins.1,3; R/ x8 G: k1 j7 E2 O0 j% r
Gonadotropin-independent peripheral preco-( o% k& O6 _. J" W& L5 n
cious puberty in boys also results from inappropriate
9 ^. ~5 B( @' ^+ d! Randrogenic stimulation from either endogenous or
5 i* X$ ?" M* }exogenous sources, nonpituitary gonadotropin stim-
6 Z# a$ [4 t, ?1 Culation, and rare activating mutations.3 Virilizing4 c. ^$ p+ A) ~
congenital adrenal hyperplasia producing excessive
7 J- z. b" N7 h8 V* gadrenal androgens is a common cause of precocious. _2 U+ O e6 j# ^3 i
puberty in boys.3,4) [7 { p* A& R5 b9 K
The most common form of congenital adrenal" x e) i) g( _1 u
hyperplasia is the 21-hydroxylase enzyme deficiency.5 l( j! U- p- W
The 11-β hydroxylase deficiency may also result in
3 s1 n' z* h/ n$ T6 p* f4 ]8 Dexcessive adrenal androgen production, and rarely,
: X/ R7 Z7 x7 u1 Ban adrenal tumor may also cause adrenal androgen$ A4 T9 J) a( y, h5 N! o6 p
excess.1,3
$ B* V* _$ e! M v' O) l3 sat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
7 h' R K7 O4 Y1 K" [ ]9 W# T0 y542 Clinical Pediatrics / Vol. 46, No. 6, July 2007- O, t0 G9 `! [
A unique entity of male-limited gonadotropin-, S! y: R/ a# z R* u( u* ~1 d
independent precocious puberty, which is also known
! F3 s8 D) F$ i% a, b+ yas testotoxicosis, may cause precocious puberty at a
$ O1 _# y" w$ N% xvery young age. The physical findings in these boys
4 Z0 R- \: B# l1 U6 o) c0 Zwith this disorder are full pubertal development,+ }: R7 {$ g4 _( I% M
including bilateral testicular growth, similar to boys3 X' y' {6 a. d- H3 o2 ?- J
with CPP. The gonadotropin levels in this disorder
- g0 i0 @) H: L5 c+ b( A+ ]) W4 @' ?are suppressed to prepubertal levels and do not show
- _6 k o! c' T# {pubertal response of gonadotropin after gonadotropin-
& `" x/ g- Q& K2 m5 hreleasing hormone stimulation. This is a sex-linked) `; F0 D% n" R) V
autosomal dominant disorder that affects only4 E" h9 o/ C k$ a5 H+ p5 F+ s
males; therefore, other male members of the family
8 Q1 m2 ]6 } _+ V9 ]3 a( Smay have similar precocious puberty.34 B& n. L% ]& ^' G0 \% m/ q
In our patient, physical examination was incon-4 p& V9 I2 E& D
sistent with true precocious puberty since his testi-
0 v* q! t+ e- tcles were prepubertal in size. However, testotoxicosis
' N6 F4 J1 T0 ~! l5 G0 p" B8 Wwas in the differential diagnosis because his father3 n5 P( U% f! ?& I8 n; ^4 [! v1 ]
started puberty somewhat early, and occasionally,+ {8 F0 i) U; x& f) _
testicular enlargement is not that evident in the7 X# i) _3 [) K0 I o' Y! _
beginning of this process.1 In the absence of a neg-
& ?% \7 [) |$ D! |ative initial history of androgen exposure, our0 }$ W1 \& t' w# e" Y- _. V
biggest concern was virilizing adrenal hyperplasia,
1 I6 g( D: ]7 f0 V* t) Teither 21-hydroxylase deficiency or 11-β hydroxylase4 _9 ?0 v, S. [: u \
deficiency. Those diagnoses were excluded by find-
- f) p( J% `0 q; |ing the normal level of adrenal steroids.
3 _9 @; Q) j V- X4 X& H9 R# VThe diagnosis of exogenous androgens was strongly
9 C& Z) n/ H' i8 R3 O# F9 [suspected in a follow-up visit after 4 months because
2 |" b% J1 J M6 z S, V# Z% mthe physical examination revealed the complete disap-
. ?( m+ a! z4 M- n7 Apearance of pubic hair, normal growth velocity, and
% y L( P6 p# g. {- D, I& X6 K: @decreased erections. The father admitted using a testos-& K G0 z2 B$ Y2 x6 ]# i: l4 h
terone gel, which he concealed at first visit. He was* o/ t8 u+ @8 y# F# @: L L6 s
using it rather frequently, twice a day. The Physicians’# U8 f: u6 D' x* S5 I
Desk Reference, or package insert of this product, gel or
3 h1 W% z' Z% A0 P; |cream, cautions about dermal testosterone transfer to) Z; l, p) A* K* r
unprotected females through direct skin exposure.3 O& ]6 n3 N. W; Z! x7 q7 j, ~+ Z& E
Serum testosterone level was found to be 2 times the# Y; A) |. ]" L. _6 D6 G
baseline value in those females who were exposed to% W9 E V# X- v: e
even 15 minutes of direct skin contact with their male# }' q7 ]$ \$ z0 V* S1 b1 A
partners.6 However, when a shirt covered the applica-
/ }+ \3 \5 o" |+ P/ J; Ftion site, this testosterone transfer was prevented.0 e! c8 D3 ^* l6 C% D
Our patient’s testosterone level was 60 ng/mL," O. K2 j* T# Q: l) n+ ~
which was clearly high. Some studies suggest that
4 d- w, W: _3 P: adermal conversion of testosterone to dihydrotestos-9 |+ x/ Q3 z$ }4 V" V, ~
terone, which is a more potent metabolite, is more' i# o. Y0 k1 T+ C( V
active in young children exposed to testosterone
3 `: x3 Z: o0 D6 N% ]& [exogenously7; however, we did not measure a dihy-
8 U: |: F8 q+ z z: _1 {8 B+ t- s: }drotestosterone level in our patient. In addition to
' o+ y `2 A: a3 A0 g0 V7 Yvirilization, exposure to exogenous testosterone in
: d! `. ]: R( V Y, H- tchildren results in an increase in growth velocity and
: c1 V% G, h o; O( Cadvanced bone age, as seen in our patient.
- Y- Q/ {3 p! @. [2 ^$ aThe long-term effect of androgen exposure during
3 ?# u1 L' y) \9 Nearly childhood on pubertal development and final
1 ^' K5 {6 V X5 |1 Fadult height are not fully known and always remain8 p" u; P5 g- ^3 O3 K, A
a concern. Children treated with short-term testos-
# z: i9 I" t' H; {terone injection or topical androgen may exhibit some
+ A' `) p* w" N9 F9 b+ `acceleration of the skeletal maturation; however, after
6 ?! a/ z, Q$ S5 R1 rcessation of treatment, the rate of bone maturation
6 N7 V* H$ ~! e$ v5 Qdecelerates and gradually returns to normal.8,9
: P! z% F, P1 j8 v2 ^, N* HThere are conflicting reports and controversy
# z: A8 |5 t3 x% N1 G6 nover the effect of early androgen exposure on adult
" W% B$ R7 g/ k/ F' w, j: [0 \penile length.10,11 Some reports suggest subnormal& T8 r, A$ q" V4 X9 C+ d
adult penile length, apparently because of downreg-
) m8 Y& r2 D/ Y" B9 E0 Wulation of androgen receptor number.10,12 However,
* g K6 q& G9 h0 w+ YSutherland et al13 did not find a correlation between
- a- ^4 Q+ O/ |8 j7 y" V p" g+ \( I9 Achildhood testosterone exposure and reduced adult# |# i1 S# \& V
penile length in clinical studies.; w6 t2 r: ?! C% k2 ?8 {- R, b
Nonetheless, we do not believe our patient is0 F' G% p5 K$ v8 \8 n d
going to experience any of the untoward effects from9 g& O0 T7 p% Z: V0 y0 c
testosterone exposure as mentioned earlier because/ z0 R, ^2 Q* V" |! \
the exposure was not for a prolonged period of time.
9 y7 d ]5 m& r. [6 b$ GAlthough the bone age was advanced at the time of1 ^! q# ^; a& z, o. B' [8 U
diagnosis, the child had a normal growth velocity at
) F3 G) N N# x' Xthe follow-up visit. It is hoped that his final adult
# O1 e* y. q) W! n9 u5 X, C! H- Iheight will not be affected.
" D, h5 |+ J8 K9 dAlthough rarely reported, the widespread avail-) [4 i" W. H1 K! c% X& S
ability of androgen products in our society may
# @0 S& T( j3 Z) Mindeed cause more virilization in male or female
, l0 j# q. u( l b7 e8 q; tchildren than one would realize. Exposure to andro-
0 P, B. I/ Y: G" t1 f& l( `gen products must be considered and specific ques-
# g7 C# _7 A- }+ H. u5 Ltioning about the use of a testosterone product or
/ ] d3 Z! v$ ]6 y4 lgel should be asked of the family members during
6 W* H" B' A0 I$ dthe evaluation of any children who present with vir-! l% }3 W* ]$ c. G% ^
ilization or peripheral precocious puberty. The diag-2 _/ s% ~- A8 h+ P5 U3 S5 V w
nosis can be established by just a few tests and by
- n {9 j( u- u, Q! E9 Xappropriate history. The inability to obtain such a
* w8 A. n1 I$ _8 a; O {1 Ihistory, or failure to ask the specific questions, may3 z$ T, e3 D" V4 J6 j1 ?7 H
result in extensive, unnecessary, and expensive0 ~) m J# [/ R" @8 U% j
investigation. The primary care physician should be
9 x, P$ B7 g) q/ @aware of this fact, because most of these children& z, Z: H X: A- z
may initially present in their practice. The Physicians’% g6 }9 y' i8 F, i/ [
Desk Reference and package insert should also put a
2 K! f6 O! Z7 `warning about the virilizing effect on a male or" C: \5 I2 ]; i5 o7 T
female child who might come in contact with some-2 y' A8 W9 v/ ? G+ U
one using any of these products.
5 w' O1 [. q( b B. |References7 u2 E% z$ F( S8 H5 P
1. Styne DM. The testes: disorder of sexual differentiation
3 |0 {6 Y. f* V( \and puberty in the male. In: Sperling MA, ed. Pediatric' l. Q9 y9 v" K1 i2 }; ?+ j5 G0 V
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;% W: C1 \) d: q2 ^# o
2002: 565-628.4 n6 [3 a9 V1 J7 E7 L0 U
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
0 B5 z n( y- p7 Y5 I+ V8 H. x6 npuberty in children with tumours of the suprasellar pineal+ _( ^) W3 N! }/ h$ r3 Q
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$ \% s5 r% H- wareas: organic central precocious puberty. Acta Paediatr., y T* K2 R) B( a9 n! Z/ u
2001;90:751-756.
W! {3 j; A4 U/ `( D3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.. z) \% h* G$ c! G) z8 X
Pediatric Endocrinology. 4th ed. New York, NY: Marcel
' M/ K: w% ]# X1 V9 ?5 |* yDekker Inc; 2003:211-238.& l0 c! h) [% C) L) S( L; A
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
7 T) j& z# a- N6 r# y+ Ndevelopment in a two-year-old boy induced by topical$ R. A. {) Y0 M1 |! n
exposure to testosterone. Pediatrics. 1999;104:e23.
+ D a: N) A8 F* v+ k5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
$ N! B8 V/ [: H3 G' ZSkeletal Development of the Hand and Wrist. 2nd ed.
6 T- l% O& l7 h, _8 F5 C7 R$ FStanford, CA: Stanford University Press; 1959.* B1 H3 b, ?' `" R/ [: l9 R. X
6. Physicians’ Desk Reference. Androgel 1% testosterone,
' p0 Z4 R, u7 \5 i% QUnimed Pharmaceutical Inc. Montvale, NJ: Medical6 O" @" t' W! |6 w; l; h
Economics Company, Inc; 2004:3239-3241.
+ A6 q4 \$ {/ f" |8 B m1 R% E4 m7. Klugo RC, Cerny JC. Response of micropenis to topical
2 h- ?2 A( o& b- l; Jtestosterone and gonadotropin. J Urol. 1978;119:8 f/ K) d, J" \+ @
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