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is a significant concern for physicians. Central; x* m9 U! g8 J5 v2 {4 g" e
precocious puberty (CPP), which is mediated
d% b k3 ?7 U8 s/ @( athrough the hypothalamic pituitary gonadal axis, has
- l H- x3 L. P; P- I; f3 Va higher incidence of organic central nervous system% Y. S! r. Q# H9 r+ }1 W' j
lesions in boys.1,2 Virilization in boys, as manifested2 z* C3 G. t+ Z4 T9 `3 O; `. m
by enlargement of the penis, development of pubic, p& I; x5 N h
hair, and facial acne without enlargement of testi-
' [ k3 ?5 \* v3 N) o9 jcles, suggests peripheral or pseudopuberty.1-3 We
) B/ A. D3 X: p5 J) V( B) Greport a 16-month-old boy who presented with the
/ l/ S. k( e+ t: @% \enlargement of the phallus and pubic hair develop-' u+ Z4 ~: u3 B0 Y
ment without testicular enlargement, which was due
! }9 Q* q! Y$ P1 O% b' d( @. F& vto the unintentional exposure to androgen gel used by! R e9 ^! M% h0 z
the father. The family initially concealed this infor-7 |. N( F0 x) ], x
mation, resulting in an extensive work-up for this8 R8 p5 d* y8 m& Y4 B" z
child. Given the widespread and easy availability of
/ N" O4 V5 S: ~" B2 {3 btestosterone gel and cream, we believe this is proba-/ |* H7 K" {' S; Y! t( `! D
bly more common than the rare case report in the- E3 w9 v0 U% M6 x1 _, D
literature.4+ u/ ]5 r/ G7 Q
Patient Report
4 @4 L% L8 k% E' F1 y- P, m: ?A 16-month-old white child was referred to the1 w ?: R9 a. z, V
endocrine clinic by his pediatrician with the concern, M# o+ f* t! Y
of early sexual development. His mother noticed
; [) }( _3 k# \( O8 ilight colored pubic hair development when he was
6 O3 [0 O/ p( B. L; s% z( l e% @From the 1Division of Pediatric Endocrinology, 2University of
; C( i" M7 P% p/ j) y8 ~% RSouth Alabama Medical Center, Mobile, Alabama.
$ e" _. j9 l1 w4 pAddress correspondence to: Samar K. Bhowmick, MD, FACE,
9 O3 k+ [! _+ H/ s+ {. s: l$ ?% E' m9 c/ VProfessor of Pediatrics, University of South Alabama, College of
0 V$ r1 e: }" sMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
, N D! X+ j! |( i6 `, [& f5 ge-mail: [email protected].
. i8 r! X4 f3 ?. v- a$ m. u" iabout 6 to 7 months old, which progressively became+ q" H9 |# P: Q$ a; {7 h! X7 H
darker. She was also concerned about the enlarge-' n( a. e- N M/ N* V, A9 x$ `5 g
ment of his penis and frequent erections. The child9 k2 N/ X5 z& ]: [
was the product of a full-term normal delivery, with. i Q( g, y8 d% Y
a birth weight of 7 lb 14 oz, and birth length of
* Y- K. N7 s* _, H0 t X$ C8 r. C20 inches. He was breast-fed throughout the first year0 x2 E( p" F' k! {! S& W6 P% R
of life and was still receiving breast milk along with
2 ~3 ^- x* q" fsolid food. He had no hospitalizations or surgery,$ A7 G4 U( |% _* b, E
and his psychosocial and psychomotor development+ H3 |' }, b6 S4 Q9 [
was age appropriate.
' H" d. i2 D# y OThe family history was remarkable for the father,& F* S* W; n- k% r8 E
who was diagnosed with hypothyroidism at age 16,: r9 Y: F( P% i1 |- m! E H
which was treated with thyroxine. The father’s
# H2 P2 k8 a# I+ t8 D5 ]8 }0 a, qheight was 6 feet, and he went through a somewhat
' O, `% X9 ]: U7 q4 o8 p* tearly puberty and had stopped growing by age 14.; h- p+ j0 }! a: O. p8 F- Y3 I. P
The father denied taking any other medication. The; O5 ^" J$ o9 J6 G- [
child’s mother was in good health. Her menarche; w7 ?" [; M1 b3 r
was at 11 years of age, and her height was at 5 feet
5 v0 f4 N$ Q) o& X) r- G5 inches. There was no other family history of pre-# r1 ~) G' B, a" V( ]
cocious sexual development in the first-degree rela-
& d$ c; _! f1 u+ D$ a( ~tives. There were no siblings./ J2 V2 z! Z1 y
Physical Examination- G$ B- S( I& G, e* }
The physical examination revealed a very active," ]! i8 L! Z- I$ ?/ L
playful, and healthy boy. The vital signs documented5 I, q! `& l. U% ^2 p, ]* \
a blood pressure of 85/50 mm Hg, his length was2 ]; i6 w8 {+ t4 }
90 cm (>97th percentile), and his weight was 14.4 kg
* |/ @* i! s+ n# T3 c4 s: n(also >97th percentile). The observed yearly growth" n5 p% i3 w( h
velocity was 30 cm (12 inches). The examination of0 n9 Q" e3 G! [! r) L/ Q
the neck revealed no thyroid enlargement.
@" L; z: P9 k/ D. g/ ~The genitourinary examination was remarkable for, a! ~7 N+ W! \! Z
enlargement of the penis, with a stretched length of( C* Y3 n* t- P1 E2 C1 S
8 cm and a width of 2 cm. The glans penis was very well0 J# |( g# h; t/ s5 B
developed. The pubic hair was Tanner II, mostly around* F+ l p0 h1 P
540
6 s8 o% z6 H! ]7 q/ Q8 n5 G* iat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ H h; a, _& _! p4 Y3 Y
the base of the phallus and was dark and curled. The
) j& V0 O% }2 K, E9 htesticular volume was prepubertal at 2 mL each.- J4 [4 f4 ~2 ]" i% s0 f# B5 v
The skin was moist and smooth and somewhat/ l- x7 ~7 H3 |, u9 B# [# A
oily. No axillary hair was noted. There were no0 ~' h! P5 B4 n7 I5 ]* i2 \5 H
abnormal skin pigmentations or café-au-lait spots.
' h/ V8 |* n4 }2 w1 s0 }Neurologic evaluation showed deep tendon reflex 2+: j: ?/ W8 n$ n
bilateral and symmetrical. There was no suggestion
1 R. Q) d4 d+ M3 i" J. G. x+ zof papilledema.
' S( C) E( @+ R& s2 LLaboratory Evaluation
* U( ~9 Y" z/ W- A7 ~) @The bone age was consistent with 28 months by5 R* R3 o; k& ~7 x M
using the standard of Greulich and Pyle at a chrono-
) E4 U3 _# \( l+ hlogic age of 16 months (advanced).5 Chromosomal
; ?. F$ @; V8 [, Hkaryotype was 46XY. The thyroid function test
/ J9 w& b0 q) O( D2 ]showed a free T4 of 1.69 ng/dL, and thyroid stimu-7 Q8 W: z+ W5 k3 A
lating hormone level was 1.3 µIU/mL (both normal).$ i! H7 F) r) U9 P
The concentrations of serum electrolytes, blood
3 Y% ^5 o, ~) q, s5 c+ Burea nitrogen, creatinine, and calcium all were
& E& x( h: W* c/ H9 K( Ewithin normal range for his age. The concentration! j) M- o' C- ~0 M' n" U7 n
of serum 17-hydroxyprogesterone was 16 ng/dL. o) L, v# q5 b/ o! @
(normal, 3 to 90 ng/dL), androstenedione was 20# d3 q" c# G; l! |
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-. P% L! {* `: u: Y$ F9 i! P G
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
( P& t3 q2 C& m8 P2 ?% ^% Adesoxycorticosterone was 4.3 ng/dL (normal, 7 to
( C6 T1 R k9 G: p3 a" A5 s1 _49ng/dL), 11-desoxycortisol (specific compound S)
5 q3 n0 I" I b5 s; R2 |was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
' W2 P0 o. `: _, b# Qtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total' w9 `6 `0 }2 l) u$ g; c
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),$ E+ P' Z( Q5 h' C2 M; D5 B5 B2 z. y
and β-human chorionic gonadotropin was less than: A! `% Q& d: j" d: N6 B
5 mIU/mL (normal <5 mIU/mL). Serum follicular" V6 U9 ?$ i) R5 s$ z
stimulating hormone and leuteinizing hormone
9 B% d- J5 D" Q% ]concentrations were less than 0.05 mIU/mL
/ Q+ x7 x+ B- U% ](prepubertal).
6 `. B3 P+ F& D$ U$ i1 ~6 hThe parents were notified about the laboratory: z+ x$ `2 i* ]
results and were informed that all of the tests were
- C! u2 [3 G. B: M9 L# unormal except the testosterone level was high. The, x- G6 J- I/ c: Q' j7 Q" w
follow-up visit was arranged within a few weeks to4 _5 q7 q( ~4 b
obtain testicular and abdominal sonograms; how-' q: [8 }# W1 ]& a
ever, the family did not return for 4 months.
1 _! h: s z3 R4 ?7 c4 iPhysical examination at this time revealed that the4 A+ X% x5 |' J& m' C
child had grown 2.5 cm in 4 months and had gained
9 D. ^) H* Z& K, I6 I9 D0 j2 kg of weight. Physical examination remained
: S" d! r3 w; L# Gunchanged. Surprisingly, the pubic hair almost com-
0 b9 |7 [8 ?" E g u& s: s, kpletely disappeared except for a few vellous hairs at7 o; E5 q* V! T) E9 ` J3 Q
the base of the phallus. Testicular volume was still 2; k) ~! _5 d% ?6 [
mL, and the size of the penis remained unchanged.4 T- B. N$ U5 p
The mother also said that the boy was no longer hav-$ e. r- l+ {8 f# j5 v1 M( e
ing frequent erections.7 |% }6 k: v3 Z2 b$ E8 J) x
Both parents were again questioned about use of4 ]7 X0 v5 _/ B' q! v
any ointment/creams that they may have applied to
, B: _( g2 a0 H* O& ^, Qthe child’s skin. This time the father admitted the9 O$ w$ C( |$ l/ K7 o
Topical Testosterone Exposure / Bhowmick et al 541
* ~1 T8 r* L. v6 kuse of testosterone gel twice daily that he was apply-
9 @' L( \2 t' c- |0 d" Ting over his own shoulders, chest, and back area for
m: z' E, g# X0 U! l) Ua year. The father also revealed he was embarrassed
. y6 i, g% W4 B2 o" _1 \to disclose that he was using a testosterone gel pre-% D3 \/ T. ]8 c- T. D; _/ {
scribed by his family physician for decreased libido1 h6 u Z5 ~+ T: `0 v
secondary to depression./ W3 B, f# P6 W( ?( W5 w2 S; ?
The child slept in the same bed with parents.
5 w5 X( \) f& W+ x: EThe father would hug the baby and hold him on his
1 J% v2 z. ?4 |) {7 F& W) O qchest for a considerable period of time, causing sig-
& x. o$ ?+ r/ Q1 V+ znificant bare skin contact between baby and father.
! {) Q, F# t) m8 ZThe father also admitted that after the phone call,
U3 m; Y0 V8 m8 Awhen he learned the testosterone level in the baby
4 |4 ?4 s( v2 H$ E/ F4 v/ Owas high, he then read the product information( r2 u- u6 H( W" q2 Y; q
packet and concluded that it was most likely the rea-
5 a; ^# n) ?% Json for the child’s virilization. At that time, they
* U8 _" v, Q {, mdecided to put the baby in a separate bed, and the& M6 B: _8 P: W- | f% X" @
father was not hugging him with bare skin and had
; Y' \! X7 N8 ^& vbeen using protective clothing. A repeat testosterone/ O( b; ?/ G) i9 t: v' f
test was ordered, but the family did not go to the
- @! k5 i+ [' ~* {2 Hlaboratory to obtain the test.( ?0 y/ A) B6 e+ J0 Z" M+ L
Discussion9 R' \$ N& T9 D+ j) T: }: b6 S
Precocious puberty in boys is defined as secondary
; K9 L9 q% Y7 p2 vsexual development before 9 years of age.1,4
: w1 |: P/ n& Q/ A/ \Precocious puberty is termed as central (true) when
- @8 t$ u: l& w5 O9 }2 _it is caused by the premature activation of hypo-
- K; z: h) S+ q% \$ ithalamic pituitary gonadal axis. CPP is more com-
4 {; W- M: x7 e$ u7 E9 \: Fmon in girls than in boys.1,3 Most boys with CPP
: |5 V4 _) }/ X2 V9 Amay have a central nervous system lesion that is* z& c! [7 a# Q' B: |
responsible for the early activation of the hypothal-
! w; \, F0 _$ x) h1 h; m3 ]! k+ }& namic pituitary gonadal axis.1-3 Thus, greater empha-5 G b' p1 r4 j* x! D* O
sis has been given to neuroradiologic imaging in
2 A# N7 [. n' D1 l o# C$ K$ T4 X' _boys with precocious puberty. In addition to viril-
5 i) p6 v; s5 n7 b. y/ \0 J- {5 }ization, the clinical hallmark of CPP is the symmet-- ?! j( |; W. M
rical testicular growth secondary to stimulation by
) H( t/ s Z7 Ogonadotropins.1,36 P( K4 g8 V+ j
Gonadotropin-independent peripheral preco-
, h+ c7 N1 q, ecious puberty in boys also results from inappropriate/ ?) ?' [. M2 i7 a0 ^0 D( R
androgenic stimulation from either endogenous or8 U, k& Q1 J, f2 C* L+ j+ L# C
exogenous sources, nonpituitary gonadotropin stim-% x4 X. i5 R7 W
ulation, and rare activating mutations.3 Virilizing
6 I: C. T& L, F: wcongenital adrenal hyperplasia producing excessive
- Z- ]9 q( P+ G: q9 F4 v- {& yadrenal androgens is a common cause of precocious
3 r6 q7 M1 N2 a8 G8 Ipuberty in boys.3,4
$ y4 B9 c: J% L3 A) J+ t( BThe most common form of congenital adrenal$ I( I3 H5 S8 r0 g
hyperplasia is the 21-hydroxylase enzyme deficiency.
/ @" R( K2 G- q/ hThe 11-β hydroxylase deficiency may also result in5 e& g& S( r1 Q7 ?. [
excessive adrenal androgen production, and rarely,
2 j/ k# G# [" ]$ c) F Tan adrenal tumor may also cause adrenal androgen
t" P+ [8 _$ }: J0 j1 wexcess.1,3# [+ E* p! H, Y, |' u/ @% z; \
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from+ x2 [3 C7 ?1 Q
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
" S) k5 G* ]8 @ c1 Z: W' OA unique entity of male-limited gonadotropin-9 e i/ L; ^- R: r4 F
independent precocious puberty, which is also known
1 \, y" G, V! q3 a8 C' `as testotoxicosis, may cause precocious puberty at a9 b1 Q3 X9 r: G6 n" }
very young age. The physical findings in these boys( q: Y8 D6 c4 X( k# H
with this disorder are full pubertal development,* f. m* O; u, z$ H4 \
including bilateral testicular growth, similar to boys
. o0 }% J( G& M% q- X1 owith CPP. The gonadotropin levels in this disorder9 `1 X' K# _. x& ]" v2 H
are suppressed to prepubertal levels and do not show
6 E* {7 l C1 Ipubertal response of gonadotropin after gonadotropin-
8 {! Y" |% K- b4 g: greleasing hormone stimulation. This is a sex-linked2 s- }# z! j. C# D# F
autosomal dominant disorder that affects only! c! ]4 j9 u) o7 d5 R
males; therefore, other male members of the family
2 W: p+ \# \; f7 ^9 Rmay have similar precocious puberty.3
. Z& M% N* x. zIn our patient, physical examination was incon-
; L( D- W2 M( g/ Ksistent with true precocious puberty since his testi-! b" a- M+ t7 f4 d7 {
cles were prepubertal in size. However, testotoxicosis
0 S9 D1 k- i# E Uwas in the differential diagnosis because his father
0 R- L0 `1 L ]* c& `* u% I- z% E8 `started puberty somewhat early, and occasionally,
, f" e( d/ k& g9 {% ^testicular enlargement is not that evident in the
& G0 O+ m, b0 C3 Z+ n! Qbeginning of this process.1 In the absence of a neg-: t! Z, y; I6 y, h
ative initial history of androgen exposure, our
& m9 Y( G5 }& x, e6 ^% hbiggest concern was virilizing adrenal hyperplasia,
' T, e+ _9 x9 b' P9 ]5 f. G' c4 Qeither 21-hydroxylase deficiency or 11-β hydroxylase- y* v5 d; M7 x0 t( b! a% J
deficiency. Those diagnoses were excluded by find-( A2 _& c- _5 W2 r5 z- g
ing the normal level of adrenal steroids.& a$ A" R6 Z( Z1 b
The diagnosis of exogenous androgens was strongly% j, ?- P8 x* E
suspected in a follow-up visit after 4 months because2 s* L& o, t7 ]5 ?
the physical examination revealed the complete disap-) G+ P' u0 i9 W7 r* t6 H$ v
pearance of pubic hair, normal growth velocity, and
6 i5 d* G; Y+ b, I0 m" Kdecreased erections. The father admitted using a testos-
6 Q: {! g/ ]" [/ c* o2 fterone gel, which he concealed at first visit. He was: |4 X" x9 D2 S( n7 k3 _
using it rather frequently, twice a day. The Physicians’
: W" t0 E2 r8 t9 ODesk Reference, or package insert of this product, gel or& k( Q: m! q- Q
cream, cautions about dermal testosterone transfer to
6 s! T/ l& q' |4 D. l. u1 y: O+ yunprotected females through direct skin exposure.
8 f( R6 Q; K/ {3 V: K iSerum testosterone level was found to be 2 times the, ^) F' Y5 m3 {% P
baseline value in those females who were exposed to* {9 {: R ]3 G/ Y1 f( Z0 Q5 W/ u, h
even 15 minutes of direct skin contact with their male6 J/ q0 w c3 ~* A) ~% Q# k
partners.6 However, when a shirt covered the applica-" q0 M+ }8 M# n, e( U- G( y7 [7 c, @
tion site, this testosterone transfer was prevented.
8 ^- a$ @2 P3 |4 k9 x5 ^# c+ L5 ]Our patient’s testosterone level was 60 ng/mL,* D! O' {( A( _% e/ G) v. {
which was clearly high. Some studies suggest that
+ [( y2 D6 t( Q5 e1 m6 tdermal conversion of testosterone to dihydrotestos-5 u! p+ t- _2 b2 a8 c8 a7 |. E
terone, which is a more potent metabolite, is more
% v! u; X8 I9 K( I& c* nactive in young children exposed to testosterone
; L2 d& N7 `/ Iexogenously7; however, we did not measure a dihy-
0 ? V' x9 j* U6 ~drotestosterone level in our patient. In addition to- z4 s/ p+ O/ z9 x+ i4 Y; J
virilization, exposure to exogenous testosterone in
- v( G& z- U* Y$ X* {0 J* achildren results in an increase in growth velocity and
3 |/ I1 Y; R" \$ Y) q1 qadvanced bone age, as seen in our patient.1 V7 t' m3 P& t9 L- h. G2 g
The long-term effect of androgen exposure during' i. K, @& E, Q; ?8 R+ b2 ?- u1 R
early childhood on pubertal development and final
1 N6 K1 ~3 ^ U# sadult height are not fully known and always remain5 M. p. u! m( C) l4 F
a concern. Children treated with short-term testos-
% W" {6 i# G# _% vterone injection or topical androgen may exhibit some
8 Z5 L, \$ C ?) W8 j' _acceleration of the skeletal maturation; however, after
, [+ L7 [; B O5 L. L. ~cessation of treatment, the rate of bone maturation
' g f% w b L2 {& s9 c5 kdecelerates and gradually returns to normal.8,9
4 l. z) } c. F, D1 b- ~+ LThere are conflicting reports and controversy
0 z. C3 {# S: h/ M! [over the effect of early androgen exposure on adult$ l" t3 `' E% |3 r1 z
penile length.10,11 Some reports suggest subnormal
1 N& h# j1 {, C3 hadult penile length, apparently because of downreg-' S9 c6 X6 l9 a N) v) f* S0 L
ulation of androgen receptor number.10,12 However,
# S+ k- y+ P+ L K/ Y6 eSutherland et al13 did not find a correlation between
A& y) w# x g" L# u' t, Ochildhood testosterone exposure and reduced adult* J2 L# J! R B! v
penile length in clinical studies.3 u z. M- O# W! p6 ]# H6 [9 K7 J/ w
Nonetheless, we do not believe our patient is: T" g5 @6 L# J0 M9 ~' @) E
going to experience any of the untoward effects from2 d0 X4 d1 s, ?5 T' s) I
testosterone exposure as mentioned earlier because; y+ v: K* @& n( Z' ~
the exposure was not for a prolonged period of time.
7 L# B( i0 d) y# t- s9 BAlthough the bone age was advanced at the time of
, c- x3 n8 j6 j6 cdiagnosis, the child had a normal growth velocity at
_; f) b; @ C3 |9 jthe follow-up visit. It is hoped that his final adult
% v& \% W7 a, s5 {; aheight will not be affected.$ w9 y% K/ e$ b( b M% C( Y$ x2 a
Although rarely reported, the widespread avail-6 x1 r# ~+ f3 w0 ^ {3 L8 Q
ability of androgen products in our society may
8 C. X5 `6 o& ]# `" ~8 I' X. H/ b5 Eindeed cause more virilization in male or female
* R" E4 S1 j* ]( T/ z: Qchildren than one would realize. Exposure to andro-
- t) E4 F1 o# L1 s. g9 T# vgen products must be considered and specific ques-/ I% ]5 ?3 g$ @
tioning about the use of a testosterone product or; f$ |8 l$ t$ ?8 s# }/ d0 I3 c% A( Y9 V
gel should be asked of the family members during& _+ d8 S. `1 s% G, T8 f* a% T0 O
the evaluation of any children who present with vir-, f+ {9 N: _9 E: T- G2 R
ilization or peripheral precocious puberty. The diag-
) ]- t! S% J; \nosis can be established by just a few tests and by
& X( h' C6 K- M& \appropriate history. The inability to obtain such a2 K* o' O' x9 o+ i/ I
history, or failure to ask the specific questions, may) I. i- P' Z! U# n( j
result in extensive, unnecessary, and expensive
" L8 B0 w+ e! f1 S( h9 minvestigation. The primary care physician should be
( Q5 l' F% L5 V+ j* q$ U/ Vaware of this fact, because most of these children
T9 a0 `% B; ?6 p/ ] k Ymay initially present in their practice. The Physicians’+ h6 S+ ^1 E$ X4 a* M i- ?
Desk Reference and package insert should also put a; ~, R" I3 D! U# v. X
warning about the virilizing effect on a male or
9 ^2 j, |* Z) e {' gfemale child who might come in contact with some-
/ j4 `' B2 D! X' B1 Q# Vone using any of these products.
0 X, ]3 ?5 j+ hReferences0 z7 }% g3 U a3 P3 Y; A
1. Styne DM. The testes: disorder of sexual differentiation) u: J% g( |$ i6 J+ |- E$ S% R4 `
and puberty in the male. In: Sperling MA, ed. Pediatric
0 H4 j& ?/ w% q- U' A. a5 \Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
! Z u" L: A1 |2002: 565-628.
9 M* w/ M3 q& \. i2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious0 W$ o2 E7 ?/ w5 Y- X( Y' S
puberty in children with tumours of the suprasellar pineal
0 k' D2 m: D' O$ L9 d/ Iat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* s) f+ y+ h; n- kTopical Testosterone Exposure / Bhowmick et al 543
3 e. U. V2 ^8 f" E4 Careas: organic central precocious puberty. Acta Paediatr.
+ |) \' [# Q9 W( @# z2001;90:751-756.
5 }& B: d1 h" L7 C+ `/ {1 J) z/ t3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.% p: f0 [% `& r# h' f1 R
Pediatric Endocrinology. 4th ed. New York, NY: Marcel5 v5 P* d' q: ]8 G. l) W
Dekker Inc; 2003:211-238.! r' E3 ~# ?- [: z3 X5 @3 A$ H
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual& g( m3 k& m \# ^6 D9 i% u
development in a two-year-old boy induced by topical
6 M! f5 C* }; Y& `# T/ d/ K5 L yexposure to testosterone. Pediatrics. 1999;104:e23.) S0 r9 r' B. e. y% D5 H
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
& D1 K& i& s/ _5 s: Z! m1 XSkeletal Development of the Hand and Wrist. 2nd ed.: }" b# `, b# h: C1 K' p8 J7 z* E
Stanford, CA: Stanford University Press; 1959., @2 V6 T% e' r
6. Physicians’ Desk Reference. Androgel 1% testosterone,
8 k% f( n, v! P6 _6 C! oUnimed Pharmaceutical Inc. Montvale, NJ: Medical
, Y" x1 b! c7 I/ EEconomics Company, Inc; 2004:3239-3241.9 g$ R5 i$ L) H2 z/ A5 v
7. Klugo RC, Cerny JC. Response of micropenis to topical
& @4 N. G! Z- I; V; otestosterone and gonadotropin. J Urol. 1978;119:
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