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is a significant concern for physicians. Central) W% s: U7 L8 X) h0 m# F7 g0 N
precocious puberty (CPP), which is mediated( t' E9 E. P/ I l5 L" Q% P
through the hypothalamic pituitary gonadal axis, has3 {) M. G! d& E
a higher incidence of organic central nervous system
8 w3 B- U; ~8 v1 w( I% t! Alesions in boys.1,2 Virilization in boys, as manifested
: ~9 \: Q8 D( b1 P% j2 Z6 Y& Y) e0 ~by enlargement of the penis, development of pubic
+ X' u) p; M M- a4 Bhair, and facial acne without enlargement of testi-
8 j5 g W% N( V+ a- Acles, suggests peripheral or pseudopuberty.1-3 We
( M* |; V# Z6 ]3 D+ H1 Kreport a 16-month-old boy who presented with the
4 n8 q8 p1 w3 D' henlargement of the phallus and pubic hair develop-
, D5 S* ~" {, H6 Qment without testicular enlargement, which was due/ d9 m; ~/ @3 e; a+ z" c& e
to the unintentional exposure to androgen gel used by' {* G) P5 ?3 {" g$ M J& H
the father. The family initially concealed this infor-
8 K# _( w) b, `# m( vmation, resulting in an extensive work-up for this+ b* c. {9 _3 |- Q6 {
child. Given the widespread and easy availability of1 J* z6 T% d) q0 s) M
testosterone gel and cream, we believe this is proba-8 l% W% A, B1 i8 p! K6 U+ R+ O
bly more common than the rare case report in the5 m" H3 o$ x& Z- k2 B% c& [$ b6 @
literature.4
) V8 r. ]$ z. E) u4 h2 XPatient Report
( K& p& F/ a1 t w9 {% R/ sA 16-month-old white child was referred to the
x; Z$ X G! G6 R# V0 A0 {7 eendocrine clinic by his pediatrician with the concern
+ O* h& V4 W. i9 D4 F1 W% nof early sexual development. His mother noticed; G' E8 }" _- e+ o# c* L- C
light colored pubic hair development when he was1 ^& |4 Z9 D s5 B- K5 [
From the 1Division of Pediatric Endocrinology, 2University of+ t0 v; f9 x2 s" Y: {" x; J; I
South Alabama Medical Center, Mobile, Alabama.8 j; C5 e$ q) T5 r
Address correspondence to: Samar K. Bhowmick, MD, FACE,
9 R: d+ E# l S: fProfessor of Pediatrics, University of South Alabama, College of
% M' @1 a9 T; D6 w; m1 k0 YMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;# u$ ^& O/ O6 ?$ N& G, ]& d
e-mail: [email protected].
) Y, T8 A5 \ ^& F0 g- _* B% labout 6 to 7 months old, which progressively became
, j2 }# ]) R; G1 {) Jdarker. She was also concerned about the enlarge-5 `8 W7 V& h+ N' O
ment of his penis and frequent erections. The child
6 ^2 G, f) R, hwas the product of a full-term normal delivery, with
' b7 r2 u: `5 m' p7 Z, J0 F% t" da birth weight of 7 lb 14 oz, and birth length of$ Y* k' V9 @3 t& J; _
20 inches. He was breast-fed throughout the first year1 w9 `$ b! k9 a/ Y
of life and was still receiving breast milk along with
. ?; t' k9 x% y2 z3 u: V3 J! Z! tsolid food. He had no hospitalizations or surgery,1 A' U& r8 n7 V& e6 A- i
and his psychosocial and psychomotor development
H3 b: m: n0 @was age appropriate.
. l2 C3 R: v6 `9 FThe family history was remarkable for the father,$ u" \/ x" Z9 k& g2 k' S
who was diagnosed with hypothyroidism at age 16,
* d) M2 O9 c2 e9 w6 Q( e" z$ T4 ^which was treated with thyroxine. The father’s
; w5 J2 B4 T1 D: J9 k. h* Uheight was 6 feet, and he went through a somewhat, N' D! {+ K( ^) B1 O; ]% ~
early puberty and had stopped growing by age 14.
- _2 U& E2 D6 A" g* NThe father denied taking any other medication. The
- w; U. n7 L& f3 H `, Z& Gchild’s mother was in good health. Her menarche
1 S* E+ u; m* D5 rwas at 11 years of age, and her height was at 5 feet
# J; i9 n! ]+ e4 N6 f5 inches. There was no other family history of pre-
0 ]) l) e" Y, Y, Ucocious sexual development in the first-degree rela- x5 U: |) f- J8 T
tives. There were no siblings. r6 B" u B% A# A) [: l
Physical Examination2 Z7 E) r) x) k; _4 U E
The physical examination revealed a very active,
$ o0 N3 q# l) B( a7 R" W, V) zplayful, and healthy boy. The vital signs documented
+ A- |: n3 {+ e t6 @, w6 [9 ^a blood pressure of 85/50 mm Hg, his length was( K, H. v5 W0 P$ F" f9 F0 p* z
90 cm (>97th percentile), and his weight was 14.4 kg
* i B/ x0 N7 L# i5 w" a; B(also >97th percentile). The observed yearly growth' ^3 m6 l, j% k4 A& C9 O2 k4 k
velocity was 30 cm (12 inches). The examination of& G9 A! V) [9 T
the neck revealed no thyroid enlargement.8 o( X& K% I t1 K6 m3 v0 u' U( f
The genitourinary examination was remarkable for2 Z7 \! n& d0 Z( D. A
enlargement of the penis, with a stretched length of
) n! u7 _7 c, ]. X2 B! `+ @8 cm and a width of 2 cm. The glans penis was very well
2 ?6 g& C9 d2 ]# @' k l+ @developed. The pubic hair was Tanner II, mostly around
; Y! j1 ]' B u- B540% C/ f3 t5 e0 B3 X8 a
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from: S. x7 G9 x* A% Z4 w8 b
the base of the phallus and was dark and curled. The4 O2 a8 V8 x- L, I y0 ]+ b
testicular volume was prepubertal at 2 mL each./ m; X* n9 J: y' R+ n; Z
The skin was moist and smooth and somewhat5 C1 ?2 Y) W& T C+ p$ z) U9 g! Y6 ]
oily. No axillary hair was noted. There were no* p6 P$ I; E# Y7 J, t0 Z8 O6 \
abnormal skin pigmentations or café-au-lait spots.
# c8 o3 H3 o7 v0 M$ [2 K9 ]4 wNeurologic evaluation showed deep tendon reflex 2+
5 f2 [" h9 f# M- fbilateral and symmetrical. There was no suggestion7 y p% z, `* S1 s( m# y* y
of papilledema.
1 M$ }, `; f3 K* V! A' lLaboratory Evaluation' j' z. o* O) o c, I
The bone age was consistent with 28 months by
1 u, Z2 k3 c1 O" ~+ C" o3 [using the standard of Greulich and Pyle at a chrono-4 V& V2 g% G7 ~( z
logic age of 16 months (advanced).5 Chromosomal9 h9 |& o6 T$ y T& ?5 ?. `
karyotype was 46XY. The thyroid function test# r0 ]9 D3 p/ C' b
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
" g4 @9 u& A5 L+ _* m `( H6 ~+ P. olating hormone level was 1.3 µIU/mL (both normal).; s, X& b' a. h2 V
The concentrations of serum electrolytes, blood
5 t% ~5 s1 _7 i& Z& [# o$ i, jurea nitrogen, creatinine, and calcium all were
, Q1 Z* X, |. s% I4 c7 Cwithin normal range for his age. The concentration% m* O# ]# N. }% |9 H
of serum 17-hydroxyprogesterone was 16 ng/dL
h: V& p5 J- R; ]1 ]- _1 Z(normal, 3 to 90 ng/dL), androstenedione was 20
2 f/ ]! `4 w. ~2 l4 w9 Wng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
, i$ h# t6 O2 C3 tterone was 38 ng/dL (normal, 50 to 760 ng/dL),( {6 j! a4 Y, E3 s
desoxycorticosterone was 4.3 ng/dL (normal, 7 to0 G- j* Z' V9 ?
49ng/dL), 11-desoxycortisol (specific compound S)0 v: ~3 g7 V' s" O) `
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-- @, v7 B1 d w' e U6 X; G+ `
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
6 D2 x7 h! F* i' q p9 ?testosterone was 60 ng/dL (normal <3 to 10 ng/dL),7 U+ I: h" G- L; y
and β-human chorionic gonadotropin was less than3 C+ i0 e" E( |* K
5 mIU/mL (normal <5 mIU/mL). Serum follicular
/ m% v- q- U; c; }4 p% hstimulating hormone and leuteinizing hormone6 N t" ]) N5 ^! c0 `# b
concentrations were less than 0.05 mIU/mL3 e2 A- l* ~8 m, E2 q
(prepubertal).
# D3 h, y" V7 J4 S; t |The parents were notified about the laboratory- V, I" ?2 ]0 K7 M
results and were informed that all of the tests were
# y. t$ S/ O' }. @- tnormal except the testosterone level was high. The: l7 n1 b4 k5 c
follow-up visit was arranged within a few weeks to2 A! G: E; ]' j+ K8 [6 z9 s) Q
obtain testicular and abdominal sonograms; how-* |6 u! ~; [# Q
ever, the family did not return for 4 months., N. o0 b' Z5 f2 [5 Y* _/ L1 W
Physical examination at this time revealed that the
1 S8 M2 B+ L4 n9 _child had grown 2.5 cm in 4 months and had gained. p1 \; K9 H. q* h4 k& U6 ^% {
2 kg of weight. Physical examination remained
- V( P' n" d2 ^+ wunchanged. Surprisingly, the pubic hair almost com-
9 U- P# L+ ^* S7 n$ rpletely disappeared except for a few vellous hairs at" S1 |' ~. c. U& K$ ^: e8 t
the base of the phallus. Testicular volume was still 2
* G- } s0 e% x. Q* UmL, and the size of the penis remained unchanged.
5 s2 x) \! T2 Q* I' h3 JThe mother also said that the boy was no longer hav-
% T# s w) `9 L* b' |/ a9 [ing frequent erections.9 v* r: o L. _# N2 {
Both parents were again questioned about use of: g. ?, d r; ^( L2 ]4 N
any ointment/creams that they may have applied to
* Y; R) l( Y3 c) |1 c1 wthe child’s skin. This time the father admitted the
7 J6 r& s/ N2 C p# `Topical Testosterone Exposure / Bhowmick et al 541
o o8 [) n* R* I* uuse of testosterone gel twice daily that he was apply-
% u" Y6 @% S; N$ G: x# Ling over his own shoulders, chest, and back area for
$ p. @% x% i& e9 ^a year. The father also revealed he was embarrassed
) ]; S; s6 |: Z3 [5 F& zto disclose that he was using a testosterone gel pre-
) {% D; a* f4 D" Y0 f; Q3 iscribed by his family physician for decreased libido( ~7 i7 B6 y7 `; r4 Y+ z( B
secondary to depression.
9 ~. p+ V, `8 t6 v. ^The child slept in the same bed with parents./ {/ Z2 E- J* A) S! P; A
The father would hug the baby and hold him on his
$ n% T* |& v& m0 `+ T Lchest for a considerable period of time, causing sig-0 N( n# T7 h, x% Y. \
nificant bare skin contact between baby and father.
# `! Y! i6 x' P) SThe father also admitted that after the phone call,7 ]( d( g* m6 ~* r* E+ u6 Y; C- n
when he learned the testosterone level in the baby
+ y0 o4 Y+ ^8 {7 o& F, R# ~2 x2 Uwas high, he then read the product information% o P! d4 F& }" n5 ^4 ?
packet and concluded that it was most likely the rea-
. p+ D* C1 X2 d2 S' wson for the child’s virilization. At that time, they) t+ w0 y6 L" j$ l- k4 e) C
decided to put the baby in a separate bed, and the
* T' C4 V4 `" i0 Hfather was not hugging him with bare skin and had
- H5 ~* W9 y2 Sbeen using protective clothing. A repeat testosterone
, g8 Z4 \6 Z' C2 jtest was ordered, but the family did not go to the
; b9 B& y3 V5 v8 T, Glaboratory to obtain the test.
, i7 r# c: p4 R2 I$ H KDiscussion
% K* j6 D* \9 J. H" B5 a! ?Precocious puberty in boys is defined as secondary: v1 K' F2 F% F3 i
sexual development before 9 years of age.1,4
: R0 b3 [, K' x$ R( [; RPrecocious puberty is termed as central (true) when$ F/ r9 ~4 n9 _9 ~
it is caused by the premature activation of hypo-
$ p3 A! j0 G5 G+ V8 w/ mthalamic pituitary gonadal axis. CPP is more com-
3 i W; I# `. n5 j8 k; [2 t" Omon in girls than in boys.1,3 Most boys with CPP
4 w9 z- e! p I+ Pmay have a central nervous system lesion that is
* k g! u8 f. x" |, O; t: m* hresponsible for the early activation of the hypothal-
9 n! e+ z$ s+ U, O" camic pituitary gonadal axis.1-3 Thus, greater empha-
6 X# ^2 }# d# {, T9 E+ x2 esis has been given to neuroradiologic imaging in
* M1 ], y0 S( M% u8 T5 Z8 wboys with precocious puberty. In addition to viril-
1 Z. T" s' l9 ~( ~8 l f! }# w9 }/ \ization, the clinical hallmark of CPP is the symmet-
0 m+ r3 j3 B4 W8 W% n$ t5 Lrical testicular growth secondary to stimulation by
* Q6 {6 [: b0 S6 X' i$ k; _gonadotropins.1,3
" S6 S% y9 l. D* k1 x8 aGonadotropin-independent peripheral preco-
8 c, n: D2 w) C+ `2 A& T7 Hcious puberty in boys also results from inappropriate
X# v6 u3 t/ ~ o nandrogenic stimulation from either endogenous or
- x8 `9 f& W# H- |: ]exogenous sources, nonpituitary gonadotropin stim- q) n- \# O7 N& B
ulation, and rare activating mutations.3 Virilizing0 R: v) }& r" T: h4 Q- I
congenital adrenal hyperplasia producing excessive
; i- U( ? t+ s% W% C" Wadrenal androgens is a common cause of precocious' N9 G9 E& D$ z
puberty in boys.3,4
; f* f6 y- u9 f4 n4 ^% J2 RThe most common form of congenital adrenal9 n1 j- e8 i( j
hyperplasia is the 21-hydroxylase enzyme deficiency.; V" ?1 f4 s0 Y6 l, B
The 11-β hydroxylase deficiency may also result in
* Y4 m1 E2 h! E5 B3 Q5 _excessive adrenal androgen production, and rarely,
$ f( I, r$ Y& \ kan adrenal tumor may also cause adrenal androgen
4 F4 t& C( m9 w6 y6 W' @excess.1,37 B2 b( E8 P9 V7 J9 X
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ a0 M: M0 j9 J3 O542 Clinical Pediatrics / Vol. 46, No. 6, July 20076 y/ Z( g$ a' S8 _' _. Y, e
A unique entity of male-limited gonadotropin-* {. @+ Z8 y$ ^+ N8 f+ [
independent precocious puberty, which is also known* u4 i8 J4 x8 r! G7 V
as testotoxicosis, may cause precocious puberty at a; V, D0 D* e5 W
very young age. The physical findings in these boys6 p) L- L r$ K
with this disorder are full pubertal development,8 y2 V4 q( @- S2 F7 d. {4 z: I
including bilateral testicular growth, similar to boys
& P( Y R& i% gwith CPP. The gonadotropin levels in this disorder
D+ A1 H+ ^1 I5 u c* Kare suppressed to prepubertal levels and do not show
" }/ H9 f1 O) A5 s- C4 y g# H% Dpubertal response of gonadotropin after gonadotropin-
! u" y3 }2 s& q% mreleasing hormone stimulation. This is a sex-linked: f- ?0 D: [) U" s) U
autosomal dominant disorder that affects only
& f# s! e; N! Q6 M- R# c7 I L+ @males; therefore, other male members of the family% P1 I: K' O* J3 X0 y
may have similar precocious puberty.3- @# N% B9 L5 L/ f0 w$ g) A/ L
In our patient, physical examination was incon-
% h, u* Y7 ]& ?! Usistent with true precocious puberty since his testi-
. I! X# s3 Y8 a0 d3 ~cles were prepubertal in size. However, testotoxicosis
) N, @2 v, S! {was in the differential diagnosis because his father
8 R5 f- i* l( L' ?- cstarted puberty somewhat early, and occasionally,1 \3 K9 S& l8 b& f. I6 ?' K9 ]
testicular enlargement is not that evident in the
+ h+ s7 Q9 ]7 C3 m6 n: D$ J/ cbeginning of this process.1 In the absence of a neg-
' e4 q& b* H+ \' Jative initial history of androgen exposure, our
/ h4 v6 J2 B7 c( mbiggest concern was virilizing adrenal hyperplasia,% P1 U0 ^) ]1 {
either 21-hydroxylase deficiency or 11-β hydroxylase
: K, D- Y; q% E5 i5 ~+ Zdeficiency. Those diagnoses were excluded by find-. b( U5 S) x+ N" v( s$ N1 G
ing the normal level of adrenal steroids.! I( h4 c3 j4 A
The diagnosis of exogenous androgens was strongly
! N Q0 H! R( Nsuspected in a follow-up visit after 4 months because. N1 q9 R' x3 k* z l1 W
the physical examination revealed the complete disap-2 ^) e: L3 Q$ c" X) R% ?( `' P
pearance of pubic hair, normal growth velocity, and
4 _# Q% R$ |& n5 m& P% @decreased erections. The father admitted using a testos-
( b' D5 ]( G/ i0 l9 E: {* sterone gel, which he concealed at first visit. He was; {3 Y, G. E' e( J$ y5 H
using it rather frequently, twice a day. The Physicians’7 n |# x, }( e# P3 Z' e0 Y. ~, `
Desk Reference, or package insert of this product, gel or9 I! \% \5 \1 ^: d
cream, cautions about dermal testosterone transfer to& f+ m& H3 ^8 `/ g* d8 M( i
unprotected females through direct skin exposure.
, e( y6 K' k* A9 Y/ U' f8 u' }Serum testosterone level was found to be 2 times the
Z0 l+ |6 U9 v. K/ S' \ _baseline value in those females who were exposed to
- l5 y9 { V! H2 d1 V1 n# {even 15 minutes of direct skin contact with their male9 D$ U W: ?# a( c) K
partners.6 However, when a shirt covered the applica-
! M8 q) h! L3 m5 m, T$ v1 Ution site, this testosterone transfer was prevented.
9 K" x. S/ L' {( q4 m3 JOur patient’s testosterone level was 60 ng/mL,( E7 R$ y! P. A" u7 W, T2 @
which was clearly high. Some studies suggest that) P8 z+ u/ A* v Z
dermal conversion of testosterone to dihydrotestos-( b. w) F4 A# Z* X. \2 Y2 g
terone, which is a more potent metabolite, is more
8 E; Q3 T% t1 {4 Hactive in young children exposed to testosterone
5 k- l9 R# f, ^1 x" ^1 ^exogenously7; however, we did not measure a dihy-
c% S# Z6 s% n+ B' L% Sdrotestosterone level in our patient. In addition to
: o. g; Y+ U4 D& dvirilization, exposure to exogenous testosterone in
3 ^7 x& @1 b. i" D8 l& zchildren results in an increase in growth velocity and
$ c6 I# u" M, K4 K9 T/ w5 Kadvanced bone age, as seen in our patient.
" {. B7 H3 A# o5 k6 @2 e* RThe long-term effect of androgen exposure during# k- |2 E3 {1 R3 N/ ~, i8 n7 Y+ s
early childhood on pubertal development and final
' o+ U# U/ ~, Z; j" \1 badult height are not fully known and always remain' A2 S9 f2 |; ^
a concern. Children treated with short-term testos-
; G( D4 I9 c' I( a$ Sterone injection or topical androgen may exhibit some
# o. ^2 V, k( }+ _7 @acceleration of the skeletal maturation; however, after( W9 E- f. I, A8 M' C
cessation of treatment, the rate of bone maturation1 G* ^4 U* l8 L) I; R+ U
decelerates and gradually returns to normal.8,9
: O1 I, J- M/ Z2 Y( ~There are conflicting reports and controversy2 w0 Q# C3 y; q% V# N! W! s) z
over the effect of early androgen exposure on adult
0 r$ F9 ]" K4 M& x$ c9 S6 A$ |$ Mpenile length.10,11 Some reports suggest subnormal0 I, ~8 I3 U- O% U- ~% V! }# B
adult penile length, apparently because of downreg-4 P2 F* |+ C$ q3 g1 P: E8 S& N
ulation of androgen receptor number.10,12 However, t- ^0 s6 i( [2 I; o
Sutherland et al13 did not find a correlation between
$ u1 i5 n" c5 p6 V+ t% F; j* e( q1 nchildhood testosterone exposure and reduced adult
1 _ i7 o3 B7 t4 a' Epenile length in clinical studies.) B7 F5 B( t) w6 d8 a
Nonetheless, we do not believe our patient is. \, z* f9 m8 ^: r4 j! e
going to experience any of the untoward effects from [. \- [ X" _
testosterone exposure as mentioned earlier because
W* X+ m" m' J$ Fthe exposure was not for a prolonged period of time.
. `+ F8 U( X$ U j! ~( aAlthough the bone age was advanced at the time of9 t1 J: n3 ~+ X/ E7 L5 q, f
diagnosis, the child had a normal growth velocity at
8 o- B$ O, K" o! O/ Z* w, Nthe follow-up visit. It is hoped that his final adult
; E8 J0 [' \0 X1 M' o Pheight will not be affected.6 c, I- l7 d# @- b" r
Although rarely reported, the widespread avail-
; ~5 b% j. R D2 Dability of androgen products in our society may, g/ z! c1 {# o) r9 l8 f6 W( f
indeed cause more virilization in male or female
+ \* c! k3 ^4 x# `8 Q1 y8 jchildren than one would realize. Exposure to andro-
. X/ M( t0 ~4 Y! n4 U6 mgen products must be considered and specific ques-- F$ l! b! P+ A/ S
tioning about the use of a testosterone product or$ R3 O; L& T9 ^& k, L
gel should be asked of the family members during2 e9 S4 y6 Z- `; R( n' i$ O' s
the evaluation of any children who present with vir-
0 I! b# j+ p+ P# ailization or peripheral precocious puberty. The diag-) ]( u+ C3 l! d5 t, g# F) ^1 A
nosis can be established by just a few tests and by
& p& R6 o( ^+ I" S/ W3 U& iappropriate history. The inability to obtain such a7 D5 E! z6 G$ S
history, or failure to ask the specific questions, may
& k/ X8 q3 ]4 ]: ^& J3 h `. P( Vresult in extensive, unnecessary, and expensive
" q* L/ E& Q4 k) r* y/ ninvestigation. The primary care physician should be+ H% B: {0 Y) |5 i/ t
aware of this fact, because most of these children
2 V# L, H* V5 C( amay initially present in their practice. The Physicians’) a" X# l7 o# p
Desk Reference and package insert should also put a
1 S$ E% k7 s" g. a( i4 ? @warning about the virilizing effect on a male or. d9 [' U- n. w3 o7 s1 a9 k5 S d
female child who might come in contact with some-
( A1 F3 w8 B" B9 None using any of these products.! O: l5 V# C: ^) X/ A' K
References9 U- |. X% }$ M+ p+ v5 D$ V9 j
1. Styne DM. The testes: disorder of sexual differentiation. d) \1 q/ B+ b: [
and puberty in the male. In: Sperling MA, ed. Pediatric( [; S3 P4 _# |/ N9 I
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
# d, m! J7 |* L/ q7 Q( s2002: 565-628.
# g7 b" i$ R; t. Y/ ?2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious5 `6 g; C: I( k# ?; {% [
puberty in children with tumours of the suprasellar pineal: [+ `* z9 z1 y3 s& ]& ]; A& i
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! z ?' X+ i' oareas: organic central precocious puberty. Acta Paediatr.
% O7 h- a3 \% S9 C5 R2001;90:751-756." z) @/ E8 |/ o& v" H' K. @8 I* n( [
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
. ]( v! h2 D$ b& ~& g8 l' X( DPediatric Endocrinology. 4th ed. New York, NY: Marcel
4 E/ C' V) i5 Y* i" l" R2 L3 {Dekker Inc; 2003:211-238.
+ f- `% N3 W. n" R* i4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
, ^, ^3 l0 R8 {! y. }development in a two-year-old boy induced by topical" b' K4 F7 ^7 a8 @; S4 {' N1 b
exposure to testosterone. Pediatrics. 1999;104:e23., I& Q& x! x% e8 r
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of( r0 k0 W* j( F$ u- I: V2 @$ l
Skeletal Development of the Hand and Wrist. 2nd ed.
; g7 c9 j0 @. x" T; S7 G7 z; gStanford, CA: Stanford University Press; 1959.
. C0 ] ~; I8 K6. Physicians’ Desk Reference. Androgel 1% testosterone,
! w$ K% V1 ^( _3 h: CUnimed Pharmaceutical Inc. Montvale, NJ: Medical
+ K' `) s: H; Y/ ]1 q4 [% ^% vEconomics Company, Inc; 2004:3239-3241.
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